//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "instsimplify"
-#include "llvm/Operator.h"
-#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/InstructionSimplify.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/Analysis/MemoryBuiltins.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/GlobalAlias.h"
+#include "llvm/IR/Operator.h"
#include "llvm/Support/ConstantRange.h"
+#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/PatternMatch.h"
#include "llvm/Support/ValueHandle.h"
-#include "llvm/Target/TargetData.h"
using namespace llvm;
using namespace llvm::PatternMatch;
STATISTIC(NumFactor , "Number of factorizations");
STATISTIC(NumReassoc, "Number of reassociations");
-static Value *SimplifyAndInst(Value *, Value *, const TargetData *,
- const DominatorTree *, unsigned);
-static Value *SimplifyBinOp(unsigned, Value *, Value *, const TargetData *,
- const DominatorTree *, unsigned);
-static Value *SimplifyCmpInst(unsigned, Value *, Value *, const TargetData *,
- const DominatorTree *, unsigned);
-static Value *SimplifyOrInst(Value *, Value *, const TargetData *,
- const DominatorTree *, unsigned);
-static Value *SimplifyXorInst(Value *, Value *, const TargetData *,
- const DominatorTree *, unsigned);
+struct Query {
+ const DataLayout *TD;
+ const TargetLibraryInfo *TLI;
+ const DominatorTree *DT;
+
+ Query(const DataLayout *td, const TargetLibraryInfo *tli,
+ const DominatorTree *dt) : TD(td), TLI(tli), DT(dt) {}
+};
+
+static Value *SimplifyAndInst(Value *, Value *, const Query &, unsigned);
+static Value *SimplifyBinOp(unsigned, Value *, Value *, const Query &,
+ unsigned);
+static Value *SimplifyCmpInst(unsigned, Value *, Value *, const Query &,
+ unsigned);
+static Value *SimplifyOrInst(Value *, Value *, const Query &, unsigned);
+static Value *SimplifyXorInst(Value *, Value *, const Query &, unsigned);
+static Value *SimplifyTruncInst(Value *, Type *, const Query &, unsigned);
/// getFalse - For a boolean type, or a vector of boolean type, return false, or
/// a vector with every element false, as appropriate for the type.
static Constant *getFalse(Type *Ty) {
- assert((Ty->isIntegerTy(1) ||
- (Ty->isVectorTy() &&
- cast<VectorType>(Ty)->getElementType()->isIntegerTy(1))) &&
+ assert(Ty->getScalarType()->isIntegerTy(1) &&
"Expected i1 type or a vector of i1!");
return Constant::getNullValue(Ty);
}
/// getTrue - For a boolean type, or a vector of boolean type, return true, or
/// a vector with every element true, as appropriate for the type.
static Constant *getTrue(Type *Ty) {
- assert((Ty->isIntegerTy(1) ||
- (Ty->isVectorTy() &&
- cast<VectorType>(Ty)->getElementType()->isIntegerTy(1))) &&
+ assert(Ty->getScalarType()->isIntegerTy(1) &&
"Expected i1 type or a vector of i1!");
return Constant::getAllOnesValue(Ty);
}
// Arguments and constants dominate all instructions.
return true;
+ // If we are processing instructions (and/or basic blocks) that have not been
+ // fully added to a function, the parent nodes may still be null. Simply
+ // return the conservative answer in these cases.
+ if (!I->getParent() || !P->getParent() || !I->getParent()->getParent())
+ return false;
+
// If we have a DominatorTree then do a precise test.
- if (DT)
+ if (DT) {
+ if (!DT->isReachableFromEntry(P->getParent()))
+ return true;
+ if (!DT->isReachableFromEntry(I->getParent()))
+ return false;
return DT->dominates(I, P);
+ }
// Otherwise, if the instruction is in the entry block, and is not an invoke,
// then it obviously dominates all phi nodes.
/// Also performs the transform "(A op' B) op C" -> "(A op C) op' (B op C)".
/// Returns the simplified value, or null if no simplification was performed.
static Value *ExpandBinOp(unsigned Opcode, Value *LHS, Value *RHS,
- unsigned OpcToExpand, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
+ unsigned OpcToExpand, const Query &Q,
+ unsigned MaxRecurse) {
Instruction::BinaryOps OpcodeToExpand = (Instruction::BinaryOps)OpcToExpand;
// Recursion is always used, so bail out at once if we already hit the limit.
if (!MaxRecurse--)
// It does! Try turning it into "(A op C) op' (B op C)".
Value *A = Op0->getOperand(0), *B = Op0->getOperand(1), *C = RHS;
// Do "A op C" and "B op C" both simplify?
- if (Value *L = SimplifyBinOp(Opcode, A, C, TD, DT, MaxRecurse))
- if (Value *R = SimplifyBinOp(Opcode, B, C, TD, DT, MaxRecurse)) {
+ if (Value *L = SimplifyBinOp(Opcode, A, C, Q, MaxRecurse))
+ if (Value *R = SimplifyBinOp(Opcode, B, C, Q, MaxRecurse)) {
// They do! Return "L op' R" if it simplifies or is already available.
// If "L op' R" equals "A op' B" then "L op' R" is just the LHS.
if ((L == A && R == B) || (Instruction::isCommutative(OpcodeToExpand)
return LHS;
}
// Otherwise return "L op' R" if it simplifies.
- if (Value *V = SimplifyBinOp(OpcodeToExpand, L, R, TD, DT,
- MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(OpcodeToExpand, L, R, Q, MaxRecurse)) {
++NumExpand;
return V;
}
// It does! Try turning it into "(A op B) op' (A op C)".
Value *A = LHS, *B = Op1->getOperand(0), *C = Op1->getOperand(1);
// Do "A op B" and "A op C" both simplify?
- if (Value *L = SimplifyBinOp(Opcode, A, B, TD, DT, MaxRecurse))
- if (Value *R = SimplifyBinOp(Opcode, A, C, TD, DT, MaxRecurse)) {
+ if (Value *L = SimplifyBinOp(Opcode, A, B, Q, MaxRecurse))
+ if (Value *R = SimplifyBinOp(Opcode, A, C, Q, MaxRecurse)) {
// They do! Return "L op' R" if it simplifies or is already available.
// If "L op' R" equals "B op' C" then "L op' R" is just the RHS.
if ((L == B && R == C) || (Instruction::isCommutative(OpcodeToExpand)
return RHS;
}
// Otherwise return "L op' R" if it simplifies.
- if (Value *V = SimplifyBinOp(OpcodeToExpand, L, R, TD, DT,
- MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(OpcodeToExpand, L, R, Q, MaxRecurse)) {
++NumExpand;
return V;
}
/// OpCodeToExtract is Mul then this tries to turn "(A*B)+(A*C)" into "A*(B+C)".
/// Returns the simplified value, or null if no simplification was performed.
static Value *FactorizeBinOp(unsigned Opcode, Value *LHS, Value *RHS,
- unsigned OpcToExtract, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
+ unsigned OpcToExtract, const Query &Q,
+ unsigned MaxRecurse) {
Instruction::BinaryOps OpcodeToExtract = (Instruction::BinaryOps)OpcToExtract;
// Recursion is always used, so bail out at once if we already hit the limit.
if (!MaxRecurse--)
Value *DD = A == C ? D : C;
// Form "A op' (B op DD)" if it simplifies completely.
// Does "B op DD" simplify?
- if (Value *V = SimplifyBinOp(Opcode, B, DD, TD, DT, MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(Opcode, B, DD, Q, MaxRecurse)) {
// It does! Return "A op' V" if it simplifies or is already available.
// If V equals B then "A op' V" is just the LHS. If V equals DD then
// "A op' V" is just the RHS.
return V == B ? LHS : RHS;
}
// Otherwise return "A op' V" if it simplifies.
- if (Value *W = SimplifyBinOp(OpcodeToExtract, A, V, TD, DT, MaxRecurse)) {
+ if (Value *W = SimplifyBinOp(OpcodeToExtract, A, V, Q, MaxRecurse)) {
++NumFactor;
return W;
}
Value *CC = B == D ? C : D;
// Form "(A op CC) op' B" if it simplifies completely..
// Does "A op CC" simplify?
- if (Value *V = SimplifyBinOp(Opcode, A, CC, TD, DT, MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(Opcode, A, CC, Q, MaxRecurse)) {
// It does! Return "V op' B" if it simplifies or is already available.
// If V equals A then "V op' B" is just the LHS. If V equals CC then
// "V op' B" is just the RHS.
return V == A ? LHS : RHS;
}
// Otherwise return "V op' B" if it simplifies.
- if (Value *W = SimplifyBinOp(OpcodeToExtract, V, B, TD, DT, MaxRecurse)) {
+ if (Value *W = SimplifyBinOp(OpcodeToExtract, V, B, Q, MaxRecurse)) {
++NumFactor;
return W;
}
/// SimplifyAssociativeBinOp - Generic simplifications for associative binary
/// operations. Returns the simpler value, or null if none was found.
static Value *SimplifyAssociativeBinOp(unsigned Opc, Value *LHS, Value *RHS,
- const TargetData *TD,
- const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
Instruction::BinaryOps Opcode = (Instruction::BinaryOps)Opc;
assert(Instruction::isAssociative(Opcode) && "Not an associative operation!");
Value *C = RHS;
// Does "B op C" simplify?
- if (Value *V = SimplifyBinOp(Opcode, B, C, TD, DT, MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(Opcode, B, C, Q, MaxRecurse)) {
// It does! Return "A op V" if it simplifies or is already available.
// If V equals B then "A op V" is just the LHS.
if (V == B) return LHS;
// Otherwise return "A op V" if it simplifies.
- if (Value *W = SimplifyBinOp(Opcode, A, V, TD, DT, MaxRecurse)) {
+ if (Value *W = SimplifyBinOp(Opcode, A, V, Q, MaxRecurse)) {
++NumReassoc;
return W;
}
Value *C = Op1->getOperand(1);
// Does "A op B" simplify?
- if (Value *V = SimplifyBinOp(Opcode, A, B, TD, DT, MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(Opcode, A, B, Q, MaxRecurse)) {
// It does! Return "V op C" if it simplifies or is already available.
// If V equals B then "V op C" is just the RHS.
if (V == B) return RHS;
// Otherwise return "V op C" if it simplifies.
- if (Value *W = SimplifyBinOp(Opcode, V, C, TD, DT, MaxRecurse)) {
+ if (Value *W = SimplifyBinOp(Opcode, V, C, Q, MaxRecurse)) {
++NumReassoc;
return W;
}
Value *C = RHS;
// Does "C op A" simplify?
- if (Value *V = SimplifyBinOp(Opcode, C, A, TD, DT, MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(Opcode, C, A, Q, MaxRecurse)) {
// It does! Return "V op B" if it simplifies or is already available.
// If V equals A then "V op B" is just the LHS.
if (V == A) return LHS;
// Otherwise return "V op B" if it simplifies.
- if (Value *W = SimplifyBinOp(Opcode, V, B, TD, DT, MaxRecurse)) {
+ if (Value *W = SimplifyBinOp(Opcode, V, B, Q, MaxRecurse)) {
++NumReassoc;
return W;
}
Value *C = Op1->getOperand(1);
// Does "C op A" simplify?
- if (Value *V = SimplifyBinOp(Opcode, C, A, TD, DT, MaxRecurse)) {
+ if (Value *V = SimplifyBinOp(Opcode, C, A, Q, MaxRecurse)) {
// It does! Return "B op V" if it simplifies or is already available.
// If V equals C then "B op V" is just the RHS.
if (V == C) return RHS;
// Otherwise return "B op V" if it simplifies.
- if (Value *W = SimplifyBinOp(Opcode, B, V, TD, DT, MaxRecurse)) {
+ if (Value *W = SimplifyBinOp(Opcode, B, V, Q, MaxRecurse)) {
++NumReassoc;
return W;
}
/// evaluating it on both branches of the select results in the same value.
/// Returns the common value if so, otherwise returns null.
static Value *ThreadBinOpOverSelect(unsigned Opcode, Value *LHS, Value *RHS,
- const TargetData *TD,
- const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
// Recursion is always used, so bail out at once if we already hit the limit.
if (!MaxRecurse--)
return 0;
Value *TV;
Value *FV;
if (SI == LHS) {
- TV = SimplifyBinOp(Opcode, SI->getTrueValue(), RHS, TD, DT, MaxRecurse);
- FV = SimplifyBinOp(Opcode, SI->getFalseValue(), RHS, TD, DT, MaxRecurse);
+ TV = SimplifyBinOp(Opcode, SI->getTrueValue(), RHS, Q, MaxRecurse);
+ FV = SimplifyBinOp(Opcode, SI->getFalseValue(), RHS, Q, MaxRecurse);
} else {
- TV = SimplifyBinOp(Opcode, LHS, SI->getTrueValue(), TD, DT, MaxRecurse);
- FV = SimplifyBinOp(Opcode, LHS, SI->getFalseValue(), TD, DT, MaxRecurse);
+ TV = SimplifyBinOp(Opcode, LHS, SI->getTrueValue(), Q, MaxRecurse);
+ FV = SimplifyBinOp(Opcode, LHS, SI->getFalseValue(), Q, MaxRecurse);
}
// If they simplified to the same value, then return the common value.
/// result in the same value. Returns the common value if so, otherwise returns
/// null.
static Value *ThreadCmpOverSelect(CmpInst::Predicate Pred, Value *LHS,
- Value *RHS, const TargetData *TD,
- const DominatorTree *DT,
+ Value *RHS, const Query &Q,
unsigned MaxRecurse) {
// Recursion is always used, so bail out at once if we already hit the limit.
if (!MaxRecurse--)
// Now that we have "cmp select(Cond, TV, FV), RHS", analyse it.
// Does "cmp TV, RHS" simplify?
- Value *TCmp = SimplifyCmpInst(Pred, TV, RHS, TD, DT, MaxRecurse);
+ Value *TCmp = SimplifyCmpInst(Pred, TV, RHS, Q, MaxRecurse);
if (TCmp == Cond) {
// It not only simplified, it simplified to the select condition. Replace
// it with 'true'.
}
// Does "cmp FV, RHS" simplify?
- Value *FCmp = SimplifyCmpInst(Pred, FV, RHS, TD, DT, MaxRecurse);
+ Value *FCmp = SimplifyCmpInst(Pred, FV, RHS, Q, MaxRecurse);
if (FCmp == Cond) {
// It not only simplified, it simplified to the select condition. Replace
// it with 'false'.
// the original comparison.
if (TCmp == FCmp)
return TCmp;
+
+ // The remaining cases only make sense if the select condition has the same
+ // type as the result of the comparison, so bail out if this is not so.
+ if (Cond->getType()->isVectorTy() != RHS->getType()->isVectorTy())
+ return 0;
// If the false value simplified to false, then the result of the compare
// is equal to "Cond && TCmp". This also catches the case when the false
// value simplified to false and the true value to true, returning "Cond".
if (match(FCmp, m_Zero()))
- if (Value *V = SimplifyAndInst(Cond, TCmp, TD, DT, MaxRecurse))
+ if (Value *V = SimplifyAndInst(Cond, TCmp, Q, MaxRecurse))
return V;
// If the true value simplified to true, then the result of the compare
// is equal to "Cond || FCmp".
if (match(TCmp, m_One()))
- if (Value *V = SimplifyOrInst(Cond, FCmp, TD, DT, MaxRecurse))
+ if (Value *V = SimplifyOrInst(Cond, FCmp, Q, MaxRecurse))
return V;
// Finally, if the false value simplified to true and the true value to
// false, then the result of the compare is equal to "!Cond".
if (match(FCmp, m_One()) && match(TCmp, m_Zero()))
if (Value *V =
SimplifyXorInst(Cond, Constant::getAllOnesValue(Cond->getType()),
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
return 0;
/// it on the incoming phi values yields the same result for every value. If so
/// returns the common value, otherwise returns null.
static Value *ThreadBinOpOverPHI(unsigned Opcode, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
// Recursion is always used, so bail out at once if we already hit the limit.
if (!MaxRecurse--)
return 0;
if (isa<PHINode>(LHS)) {
PI = cast<PHINode>(LHS);
// Bail out if RHS and the phi may be mutually interdependent due to a loop.
- if (!ValueDominatesPHI(RHS, PI, DT))
+ if (!ValueDominatesPHI(RHS, PI, Q.DT))
return 0;
} else {
assert(isa<PHINode>(RHS) && "No PHI instruction operand!");
PI = cast<PHINode>(RHS);
// Bail out if LHS and the phi may be mutually interdependent due to a loop.
- if (!ValueDominatesPHI(LHS, PI, DT))
+ if (!ValueDominatesPHI(LHS, PI, Q.DT))
return 0;
}
// If the incoming value is the phi node itself, it can safely be skipped.
if (Incoming == PI) continue;
Value *V = PI == LHS ?
- SimplifyBinOp(Opcode, Incoming, RHS, TD, DT, MaxRecurse) :
- SimplifyBinOp(Opcode, LHS, Incoming, TD, DT, MaxRecurse);
+ SimplifyBinOp(Opcode, Incoming, RHS, Q, MaxRecurse) :
+ SimplifyBinOp(Opcode, LHS, Incoming, Q, MaxRecurse);
// If the operation failed to simplify, or simplified to a different value
// to previously, then give up.
if (!V || (CommonValue && V != CommonValue))
/// incoming phi values yields the same result every time. If so returns the
/// common result, otherwise returns null.
static Value *ThreadCmpOverPHI(CmpInst::Predicate Pred, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
// Recursion is always used, so bail out at once if we already hit the limit.
if (!MaxRecurse--)
return 0;
PHINode *PI = cast<PHINode>(LHS);
// Bail out if RHS and the phi may be mutually interdependent due to a loop.
- if (!ValueDominatesPHI(RHS, PI, DT))
+ if (!ValueDominatesPHI(RHS, PI, Q.DT))
return 0;
// Evaluate the BinOp on the incoming phi values.
Value *Incoming = PI->getIncomingValue(i);
// If the incoming value is the phi node itself, it can safely be skipped.
if (Incoming == PI) continue;
- Value *V = SimplifyCmpInst(Pred, Incoming, RHS, TD, DT, MaxRecurse);
+ Value *V = SimplifyCmpInst(Pred, Incoming, RHS, Q, MaxRecurse);
// If the operation failed to simplify, or simplified to a different value
// to previously, then give up.
if (!V || (CommonValue && V != CommonValue))
/// SimplifyAddInst - Given operands for an Add, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyAddInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { CLHS, CRHS };
- return ConstantFoldInstOperands(Instruction::Add, CLHS->getType(),
- Ops, TD);
+ return ConstantFoldInstOperands(Instruction::Add, CLHS->getType(), Ops,
+ Q.TD, Q.TLI);
}
// Canonicalize the constant to the RHS.
/// i1 add -> xor.
if (MaxRecurse && Op0->getType()->isIntegerTy(1))
- if (Value *V = SimplifyXorInst(Op0, Op1, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyXorInst(Op0, Op1, Q, MaxRecurse-1))
return V;
// Try some generic simplifications for associative operations.
- if (Value *V = SimplifyAssociativeBinOp(Instruction::Add, Op0, Op1, TD, DT,
+ if (Value *V = SimplifyAssociativeBinOp(Instruction::Add, Op0, Op1, Q,
MaxRecurse))
return V;
// Mul distributes over Add. Try some generic simplifications based on this.
if (Value *V = FactorizeBinOp(Instruction::Add, Op0, Op1, Instruction::Mul,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// Threading Add over selects and phi nodes is pointless, so don't bother.
}
Value *llvm::SimplifyAddInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyAddInst(Op0, Op1, isNSW, isNUW, TD, DT, RecursionLimit);
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyAddInst(Op0, Op1, isNSW, isNUW, Query (TD, TLI, DT),
+ RecursionLimit);
+}
+
+/// \brief Compute the base pointer and cumulative constant offsets for V.
+///
+/// This strips all constant offsets off of V, leaving it the base pointer, and
+/// accumulates the total constant offset applied in the returned constant. It
+/// returns 0 if V is not a pointer, and returns the constant '0' if there are
+/// no constant offsets applied.
+///
+/// This is very similar to GetPointerBaseWithConstantOffset except it doesn't
+/// follow non-inbounds geps. This allows it to remain usable for icmp ult/etc.
+/// folding.
+static Constant *stripAndComputeConstantOffsets(const DataLayout *TD,
+ Value *&V) {
+ assert(V->getType()->getScalarType()->isPointerTy());
+
+ // Without DataLayout, just be conservative for now. Theoretically, more could
+ // be done in this case.
+ if (!TD)
+ return ConstantInt::get(IntegerType::get(V->getContext(), 64), 0);
+
+ unsigned IntPtrWidth = TD->getPointerSizeInBits();
+ APInt Offset = APInt::getNullValue(IntPtrWidth);
+
+ // Even though we don't look through PHI nodes, we could be called on an
+ // instruction in an unreachable block, which may be on a cycle.
+ SmallPtrSet<Value *, 4> Visited;
+ Visited.insert(V);
+ do {
+ if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
+ if (!GEP->isInBounds() || !GEP->accumulateConstantOffset(*TD, Offset))
+ break;
+ V = GEP->getPointerOperand();
+ } else if (Operator::getOpcode(V) == Instruction::BitCast) {
+ V = cast<Operator>(V)->getOperand(0);
+ } else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V)) {
+ if (GA->mayBeOverridden())
+ break;
+ V = GA->getAliasee();
+ } else {
+ break;
+ }
+ assert(V->getType()->getScalarType()->isPointerTy() &&
+ "Unexpected operand type!");
+ } while (Visited.insert(V));
+
+ Type *IntPtrTy = TD->getIntPtrType(V->getContext());
+ Constant *OffsetIntPtr = ConstantInt::get(IntPtrTy, Offset);
+ if (V->getType()->isVectorTy())
+ return ConstantVector::getSplat(V->getType()->getVectorNumElements(),
+ OffsetIntPtr);
+ return OffsetIntPtr;
+}
+
+/// \brief Compute the constant difference between two pointer values.
+/// If the difference is not a constant, returns zero.
+static Constant *computePointerDifference(const DataLayout *TD,
+ Value *LHS, Value *RHS) {
+ Constant *LHSOffset = stripAndComputeConstantOffsets(TD, LHS);
+ Constant *RHSOffset = stripAndComputeConstantOffsets(TD, RHS);
+
+ // If LHS and RHS are not related via constant offsets to the same base
+ // value, there is nothing we can do here.
+ if (LHS != RHS)
+ return 0;
+
+ // Otherwise, the difference of LHS - RHS can be computed as:
+ // LHS - RHS
+ // = (LHSOffset + Base) - (RHSOffset + Base)
+ // = LHSOffset - RHSOffset
+ return ConstantExpr::getSub(LHSOffset, RHSOffset);
}
/// SimplifySubInst - Given operands for a Sub, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifySubInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
if (Constant *CLHS = dyn_cast<Constant>(Op0))
if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { CLHS, CRHS };
return ConstantFoldInstOperands(Instruction::Sub, CLHS->getType(),
- Ops, TD);
+ Ops, Q.TD, Q.TLI);
}
// X - undef -> undef
Value *Y = 0, *Z = Op1;
if (MaxRecurse && match(Op0, m_Add(m_Value(X), m_Value(Y)))) { // (X + Y) - Z
// See if "V === Y - Z" simplifies.
- if (Value *V = SimplifyBinOp(Instruction::Sub, Y, Z, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyBinOp(Instruction::Sub, Y, Z, Q, MaxRecurse-1))
// It does! Now see if "X + V" simplifies.
- if (Value *W = SimplifyBinOp(Instruction::Add, X, V, TD, DT,
- MaxRecurse-1)) {
+ if (Value *W = SimplifyBinOp(Instruction::Add, X, V, Q, MaxRecurse-1)) {
// It does, we successfully reassociated!
++NumReassoc;
return W;
}
// See if "V === X - Z" simplifies.
- if (Value *V = SimplifyBinOp(Instruction::Sub, X, Z, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyBinOp(Instruction::Sub, X, Z, Q, MaxRecurse-1))
// It does! Now see if "Y + V" simplifies.
- if (Value *W = SimplifyBinOp(Instruction::Add, Y, V, TD, DT,
- MaxRecurse-1)) {
+ if (Value *W = SimplifyBinOp(Instruction::Add, Y, V, Q, MaxRecurse-1)) {
// It does, we successfully reassociated!
++NumReassoc;
return W;
X = Op0;
if (MaxRecurse && match(Op1, m_Add(m_Value(Y), m_Value(Z)))) { // X - (Y + Z)
// See if "V === X - Y" simplifies.
- if (Value *V = SimplifyBinOp(Instruction::Sub, X, Y, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyBinOp(Instruction::Sub, X, Y, Q, MaxRecurse-1))
// It does! Now see if "V - Z" simplifies.
- if (Value *W = SimplifyBinOp(Instruction::Sub, V, Z, TD, DT,
- MaxRecurse-1)) {
+ if (Value *W = SimplifyBinOp(Instruction::Sub, V, Z, Q, MaxRecurse-1)) {
// It does, we successfully reassociated!
++NumReassoc;
return W;
}
// See if "V === X - Z" simplifies.
- if (Value *V = SimplifyBinOp(Instruction::Sub, X, Z, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyBinOp(Instruction::Sub, X, Z, Q, MaxRecurse-1))
// It does! Now see if "V - Y" simplifies.
- if (Value *W = SimplifyBinOp(Instruction::Sub, V, Y, TD, DT,
- MaxRecurse-1)) {
+ if (Value *W = SimplifyBinOp(Instruction::Sub, V, Y, Q, MaxRecurse-1)) {
// It does, we successfully reassociated!
++NumReassoc;
return W;
Z = Op0;
if (MaxRecurse && match(Op1, m_Sub(m_Value(X), m_Value(Y)))) // Z - (X - Y)
// See if "V === Z - X" simplifies.
- if (Value *V = SimplifyBinOp(Instruction::Sub, Z, X, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyBinOp(Instruction::Sub, Z, X, Q, MaxRecurse-1))
// It does! Now see if "V + Y" simplifies.
- if (Value *W = SimplifyBinOp(Instruction::Add, V, Y, TD, DT,
- MaxRecurse-1)) {
+ if (Value *W = SimplifyBinOp(Instruction::Add, V, Y, Q, MaxRecurse-1)) {
// It does, we successfully reassociated!
++NumReassoc;
return W;
}
+ // trunc(X) - trunc(Y) -> trunc(X - Y) if everything simplifies.
+ if (MaxRecurse && match(Op0, m_Trunc(m_Value(X))) &&
+ match(Op1, m_Trunc(m_Value(Y))))
+ if (X->getType() == Y->getType())
+ // See if "V === X - Y" simplifies.
+ if (Value *V = SimplifyBinOp(Instruction::Sub, X, Y, Q, MaxRecurse-1))
+ // It does! Now see if "trunc V" simplifies.
+ if (Value *W = SimplifyTruncInst(V, Op0->getType(), Q, MaxRecurse-1))
+ // It does, return the simplified "trunc V".
+ return W;
+
+ // Variations on GEP(base, I, ...) - GEP(base, i, ...) -> GEP(null, I-i, ...).
+ if (match(Op0, m_PtrToInt(m_Value(X))) &&
+ match(Op1, m_PtrToInt(m_Value(Y))))
+ if (Constant *Result = computePointerDifference(Q.TD, X, Y))
+ return ConstantExpr::getIntegerCast(Result, Op0->getType(), true);
+
// Mul distributes over Sub. Try some generic simplifications based on this.
if (Value *V = FactorizeBinOp(Instruction::Sub, Op0, Op1, Instruction::Mul,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// i1 sub -> xor.
if (MaxRecurse && Op0->getType()->isIntegerTy(1))
- if (Value *V = SimplifyXorInst(Op0, Op1, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyXorInst(Op0, Op1, Q, MaxRecurse-1))
return V;
// Threading Sub over selects and phi nodes is pointless, so don't bother.
}
Value *llvm::SimplifySubInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifySubInst(Op0, Op1, isNSW, isNUW, TD, DT, RecursionLimit);
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifySubInst(Op0, Op1, isNSW, isNUW, Query (TD, TLI, DT),
+ RecursionLimit);
+}
+
+/// Given operands for an FAdd, see if we can fold the result. If not, this
+/// returns null.
+static Value *SimplifyFAddInst(Value *Op0, Value *Op1, FastMathFlags FMF,
+ const Query &Q, unsigned MaxRecurse) {
+ if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
+ if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
+ Constant *Ops[] = { CLHS, CRHS };
+ return ConstantFoldInstOperands(Instruction::FAdd, CLHS->getType(),
+ Ops, Q.TD, Q.TLI);
+ }
+
+ // Canonicalize the constant to the RHS.
+ std::swap(Op0, Op1);
+ }
+
+ // fadd X, -0 ==> X
+ if (match(Op1, m_NegZero()))
+ return Op0;
+
+ // fadd X, 0 ==> X, when we know X is not -0
+ if (match(Op1, m_Zero()) &&
+ (FMF.noSignedZeros() || CannotBeNegativeZero(Op0)))
+ return Op0;
+
+ // fadd [nnan ninf] X, (fsub [nnan ninf] 0, X) ==> 0
+ // where nnan and ninf have to occur at least once somewhere in this
+ // expression
+ Value *SubOp = 0;
+ if (match(Op1, m_FSub(m_AnyZero(), m_Specific(Op0))))
+ SubOp = Op1;
+ else if (match(Op0, m_FSub(m_AnyZero(), m_Specific(Op1))))
+ SubOp = Op0;
+ if (SubOp) {
+ Instruction *FSub = cast<Instruction>(SubOp);
+ if ((FMF.noNaNs() || FSub->hasNoNaNs()) &&
+ (FMF.noInfs() || FSub->hasNoInfs()))
+ return Constant::getNullValue(Op0->getType());
+ }
+
+ return 0;
+}
+
+/// Given operands for an FSub, see if we can fold the result. If not, this
+/// returns null.
+static Value *SimplifyFSubInst(Value *Op0, Value *Op1, FastMathFlags FMF,
+ const Query &Q, unsigned MaxRecurse) {
+ if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
+ if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
+ Constant *Ops[] = { CLHS, CRHS };
+ return ConstantFoldInstOperands(Instruction::FSub, CLHS->getType(),
+ Ops, Q.TD, Q.TLI);
+ }
+ }
+
+ // fsub X, 0 ==> X
+ if (match(Op1, m_Zero()))
+ return Op0;
+
+ // fsub X, -0 ==> X, when we know X is not -0
+ if (match(Op1, m_NegZero()) &&
+ (FMF.noSignedZeros() || CannotBeNegativeZero(Op0)))
+ return Op0;
+
+ // fsub 0, (fsub -0.0, X) ==> X
+ Value *X;
+ if (match(Op0, m_AnyZero())) {
+ if (match(Op1, m_FSub(m_NegZero(), m_Value(X))))
+ return X;
+ if (FMF.noSignedZeros() && match(Op1, m_FSub(m_AnyZero(), m_Value(X))))
+ return X;
+ }
+
+ // fsub nnan ninf x, x ==> 0.0
+ if (FMF.noNaNs() && FMF.noInfs() && Op0 == Op1)
+ return Constant::getNullValue(Op0->getType());
+
+ return 0;
+}
+
+/// Given the operands for an FMul, see if we can fold the result
+static Value *SimplifyFMulInst(Value *Op0, Value *Op1,
+ FastMathFlags FMF,
+ const Query &Q,
+ unsigned MaxRecurse) {
+ if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
+ if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
+ Constant *Ops[] = { CLHS, CRHS };
+ return ConstantFoldInstOperands(Instruction::FMul, CLHS->getType(),
+ Ops, Q.TD, Q.TLI);
+ }
+
+ // Canonicalize the constant to the RHS.
+ std::swap(Op0, Op1);
+ }
+
+ // fmul X, 1.0 ==> X
+ if (match(Op1, m_FPOne()))
+ return Op0;
+
+ // fmul nnan nsz X, 0 ==> 0
+ if (FMF.noNaNs() && FMF.noSignedZeros() && match(Op1, m_AnyZero()))
+ return Op1;
+
+ return 0;
}
/// SimplifyMulInst - Given operands for a Mul, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifyMulInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
+static Value *SimplifyMulInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { CLHS, CRHS };
return ConstantFoldInstOperands(Instruction::Mul, CLHS->getType(),
- Ops, TD);
+ Ops, Q.TD, Q.TLI);
}
// Canonicalize the constant to the RHS.
return Op0;
// (X / Y) * Y -> X if the division is exact.
- Value *X = 0, *Y = 0;
- if ((match(Op0, m_IDiv(m_Value(X), m_Value(Y))) && Y == Op1) || // (X / Y) * Y
- (match(Op1, m_IDiv(m_Value(X), m_Value(Y))) && Y == Op0)) { // Y * (X / Y)
- PossiblyExactOperator *Div =
- cast<PossiblyExactOperator>(Y == Op1 ? Op0 : Op1);
- if (Div->isExact())
- return X;
- }
+ Value *X = 0;
+ if (match(Op0, m_Exact(m_IDiv(m_Value(X), m_Specific(Op1)))) || // (X / Y) * Y
+ match(Op1, m_Exact(m_IDiv(m_Value(X), m_Specific(Op0))))) // Y * (X / Y)
+ return X;
// i1 mul -> and.
if (MaxRecurse && Op0->getType()->isIntegerTy(1))
- if (Value *V = SimplifyAndInst(Op0, Op1, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyAndInst(Op0, Op1, Q, MaxRecurse-1))
return V;
// Try some generic simplifications for associative operations.
- if (Value *V = SimplifyAssociativeBinOp(Instruction::Mul, Op0, Op1, TD, DT,
+ if (Value *V = SimplifyAssociativeBinOp(Instruction::Mul, Op0, Op1, Q,
MaxRecurse))
return V;
// Mul distributes over Add. Try some generic simplifications based on this.
if (Value *V = ExpandBinOp(Instruction::Mul, Op0, Op1, Instruction::Add,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// If the operation is with the result of a select instruction, check whether
// operating on either branch of the select always yields the same value.
if (isa<SelectInst>(Op0) || isa<SelectInst>(Op1))
- if (Value *V = ThreadBinOpOverSelect(Instruction::Mul, Op0, Op1, TD, DT,
+ if (Value *V = ThreadBinOpOverSelect(Instruction::Mul, Op0, Op1, Q,
MaxRecurse))
return V;
// If the operation is with the result of a phi instruction, check whether
// operating on all incoming values of the phi always yields the same value.
if (isa<PHINode>(Op0) || isa<PHINode>(Op1))
- if (Value *V = ThreadBinOpOverPHI(Instruction::Mul, Op0, Op1, TD, DT,
+ if (Value *V = ThreadBinOpOverPHI(Instruction::Mul, Op0, Op1, Q,
MaxRecurse))
return V;
return 0;
}
-Value *llvm::SimplifyMulInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyFAddInst(Value *Op0, Value *Op1, FastMathFlags FMF,
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyFAddInst(Op0, Op1, FMF, Query (TD, TLI, DT), RecursionLimit);
+}
+
+Value *llvm::SimplifyFSubInst(Value *Op0, Value *Op1, FastMathFlags FMF,
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyFSubInst(Op0, Op1, FMF, Query (TD, TLI, DT), RecursionLimit);
+}
+
+Value *llvm::SimplifyFMulInst(Value *Op0, Value *Op1,
+ FastMathFlags FMF,
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyFMulInst(Op0, Op1, FMF, Query (TD, TLI, DT), RecursionLimit);
+}
+
+Value *llvm::SimplifyMulInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyMulInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyMulInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyDiv - Given operands for an SDiv or UDiv, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyDiv(Instruction::BinaryOps Opcode, Value *Op0, Value *Op1,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
if (Constant *C0 = dyn_cast<Constant>(Op0)) {
if (Constant *C1 = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { C0, C1 };
- return ConstantFoldInstOperands(Opcode, C0->getType(), Ops, TD);
+ return ConstantFoldInstOperands(Opcode, C0->getType(), Ops, Q.TD, Q.TLI);
}
}
// If the operation is with the result of a select instruction, check whether
// operating on either branch of the select always yields the same value.
if (isa<SelectInst>(Op0) || isa<SelectInst>(Op1))
- if (Value *V = ThreadBinOpOverSelect(Opcode, Op0, Op1, TD, DT, MaxRecurse))
+ if (Value *V = ThreadBinOpOverSelect(Opcode, Op0, Op1, Q, MaxRecurse))
return V;
// If the operation is with the result of a phi instruction, check whether
// operating on all incoming values of the phi always yields the same value.
if (isa<PHINode>(Op0) || isa<PHINode>(Op1))
- if (Value *V = ThreadBinOpOverPHI(Opcode, Op0, Op1, TD, DT, MaxRecurse))
+ if (Value *V = ThreadBinOpOverPHI(Opcode, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
/// SimplifySDivInst - Given operands for an SDiv, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifySDivInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
- if (Value *V = SimplifyDiv(Instruction::SDiv, Op0, Op1, TD, DT, MaxRecurse))
+static Value *SimplifySDivInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
+ if (Value *V = SimplifyDiv(Instruction::SDiv, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
}
-Value *llvm::SimplifySDivInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifySDivInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifySDivInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifySDivInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyUDivInst - Given operands for a UDiv, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifyUDivInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
- if (Value *V = SimplifyDiv(Instruction::UDiv, Op0, Op1, TD, DT, MaxRecurse))
+static Value *SimplifyUDivInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
+ if (Value *V = SimplifyDiv(Instruction::UDiv, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
}
-Value *llvm::SimplifyUDivInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyUDivInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyUDivInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyUDivInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
-static Value *SimplifyFDivInst(Value *Op0, Value *Op1, const TargetData *,
- const DominatorTree *, unsigned) {
+static Value *SimplifyFDivInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned) {
// undef / X -> undef (the undef could be a snan).
if (match(Op0, m_Undef()))
return Op0;
return 0;
}
-Value *llvm::SimplifyFDivInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyFDivInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyFDivInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyFDivInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyRem - Given operands for an SRem or URem, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyRem(Instruction::BinaryOps Opcode, Value *Op0, Value *Op1,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
if (Constant *C0 = dyn_cast<Constant>(Op0)) {
if (Constant *C1 = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { C0, C1 };
- return ConstantFoldInstOperands(Opcode, C0->getType(), Ops, TD);
+ return ConstantFoldInstOperands(Opcode, C0->getType(), Ops, Q.TD, Q.TLI);
}
}
// If the operation is with the result of a select instruction, check whether
// operating on either branch of the select always yields the same value.
if (isa<SelectInst>(Op0) || isa<SelectInst>(Op1))
- if (Value *V = ThreadBinOpOverSelect(Opcode, Op0, Op1, TD, DT, MaxRecurse))
+ if (Value *V = ThreadBinOpOverSelect(Opcode, Op0, Op1, Q, MaxRecurse))
return V;
// If the operation is with the result of a phi instruction, check whether
// operating on all incoming values of the phi always yields the same value.
if (isa<PHINode>(Op0) || isa<PHINode>(Op1))
- if (Value *V = ThreadBinOpOverPHI(Opcode, Op0, Op1, TD, DT, MaxRecurse))
+ if (Value *V = ThreadBinOpOverPHI(Opcode, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
/// SimplifySRemInst - Given operands for an SRem, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifySRemInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
- if (Value *V = SimplifyRem(Instruction::SRem, Op0, Op1, TD, DT, MaxRecurse))
+static Value *SimplifySRemInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
+ if (Value *V = SimplifyRem(Instruction::SRem, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
}
-Value *llvm::SimplifySRemInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifySRemInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifySRemInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifySRemInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyURemInst - Given operands for a URem, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifyURemInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
- if (Value *V = SimplifyRem(Instruction::URem, Op0, Op1, TD, DT, MaxRecurse))
+static Value *SimplifyURemInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
+ if (Value *V = SimplifyRem(Instruction::URem, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
}
-Value *llvm::SimplifyURemInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyURemInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyURemInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyURemInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
-static Value *SimplifyFRemInst(Value *Op0, Value *Op1, const TargetData *,
- const DominatorTree *, unsigned) {
+static Value *SimplifyFRemInst(Value *Op0, Value *Op1, const Query &,
+ unsigned) {
// undef % X -> undef (the undef could be a snan).
if (match(Op0, m_Undef()))
return Op0;
return 0;
}
-Value *llvm::SimplifyFRemInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyFRemInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyFRemInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyFRemInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyShift - Given operands for an Shl, LShr or AShr, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyShift(unsigned Opcode, Value *Op0, Value *Op1,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
if (Constant *C0 = dyn_cast<Constant>(Op0)) {
if (Constant *C1 = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { C0, C1 };
- return ConstantFoldInstOperands(Opcode, C0->getType(), Ops, TD);
+ return ConstantFoldInstOperands(Opcode, C0->getType(), Ops, Q.TD, Q.TLI);
}
}
// If the operation is with the result of a select instruction, check whether
// operating on either branch of the select always yields the same value.
if (isa<SelectInst>(Op0) || isa<SelectInst>(Op1))
- if (Value *V = ThreadBinOpOverSelect(Opcode, Op0, Op1, TD, DT, MaxRecurse))
+ if (Value *V = ThreadBinOpOverSelect(Opcode, Op0, Op1, Q, MaxRecurse))
return V;
// If the operation is with the result of a phi instruction, check whether
// operating on all incoming values of the phi always yields the same value.
if (isa<PHINode>(Op0) || isa<PHINode>(Op1))
- if (Value *V = ThreadBinOpOverPHI(Opcode, Op0, Op1, TD, DT, MaxRecurse))
+ if (Value *V = ThreadBinOpOverPHI(Opcode, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
/// SimplifyShlInst - Given operands for an Shl, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyShlInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
- if (Value *V = SimplifyShift(Instruction::Shl, Op0, Op1, TD, DT, MaxRecurse))
+ const Query &Q, unsigned MaxRecurse) {
+ if (Value *V = SimplifyShift(Instruction::Shl, Op0, Op1, Q, MaxRecurse))
return V;
// undef << X -> 0
// (X >> A) << A -> X
Value *X;
- if (match(Op0, m_Shr(m_Value(X), m_Specific(Op1))) &&
- cast<PossiblyExactOperator>(Op0)->isExact())
+ if (match(Op0, m_Exact(m_Shr(m_Value(X), m_Specific(Op1)))))
return X;
return 0;
}
Value *llvm::SimplifyShlInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyShlInst(Op0, Op1, isNSW, isNUW, TD, DT, RecursionLimit);
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyShlInst(Op0, Op1, isNSW, isNUW, Query (TD, TLI, DT),
+ RecursionLimit);
}
/// SimplifyLShrInst - Given operands for an LShr, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyLShrInst(Value *Op0, Value *Op1, bool isExact,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
- if (Value *V = SimplifyShift(Instruction::LShr, Op0, Op1, TD, DT, MaxRecurse))
+ const Query &Q, unsigned MaxRecurse) {
+ if (Value *V = SimplifyShift(Instruction::LShr, Op0, Op1, Q, MaxRecurse))
return V;
+ // X >> X -> 0
+ if (Op0 == Op1)
+ return Constant::getNullValue(Op0->getType());
+
// undef >>l X -> 0
if (match(Op0, m_Undef()))
return Constant::getNullValue(Op0->getType());
}
Value *llvm::SimplifyLShrInst(Value *Op0, Value *Op1, bool isExact,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyLShrInst(Op0, Op1, isExact, TD, DT, RecursionLimit);
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyLShrInst(Op0, Op1, isExact, Query (TD, TLI, DT),
+ RecursionLimit);
}
/// SimplifyAShrInst - Given operands for an AShr, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyAShrInst(Value *Op0, Value *Op1, bool isExact,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
- if (Value *V = SimplifyShift(Instruction::AShr, Op0, Op1, TD, DT, MaxRecurse))
+ const Query &Q, unsigned MaxRecurse) {
+ if (Value *V = SimplifyShift(Instruction::AShr, Op0, Op1, Q, MaxRecurse))
return V;
+ // X >> X -> 0
+ if (Op0 == Op1)
+ return Constant::getNullValue(Op0->getType());
+
// all ones >>a X -> all ones
if (match(Op0, m_AllOnes()))
return Op0;
}
Value *llvm::SimplifyAShrInst(Value *Op0, Value *Op1, bool isExact,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyAShrInst(Op0, Op1, isExact, TD, DT, RecursionLimit);
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyAShrInst(Op0, Op1, isExact, Query (TD, TLI, DT),
+ RecursionLimit);
}
/// SimplifyAndInst - Given operands for an And, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifyAndInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
+static Value *SimplifyAndInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { CLHS, CRHS };
return ConstantFoldInstOperands(Instruction::And, CLHS->getType(),
- Ops, TD);
+ Ops, Q.TD, Q.TLI);
}
// Canonicalize the constant to the RHS.
// A & (-A) = A if A is a power of two or zero.
if (match(Op0, m_Neg(m_Specific(Op1))) ||
match(Op1, m_Neg(m_Specific(Op0)))) {
- if (isPowerOfTwo(Op0, TD, /*OrZero*/true))
+ if (isKnownToBeAPowerOfTwo(Op0, /*OrZero*/true))
return Op0;
- if (isPowerOfTwo(Op1, TD, /*OrZero*/true))
+ if (isKnownToBeAPowerOfTwo(Op1, /*OrZero*/true))
return Op1;
}
// Try some generic simplifications for associative operations.
- if (Value *V = SimplifyAssociativeBinOp(Instruction::And, Op0, Op1, TD, DT,
+ if (Value *V = SimplifyAssociativeBinOp(Instruction::And, Op0, Op1, Q,
MaxRecurse))
return V;
// And distributes over Or. Try some generic simplifications based on this.
if (Value *V = ExpandBinOp(Instruction::And, Op0, Op1, Instruction::Or,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// And distributes over Xor. Try some generic simplifications based on this.
if (Value *V = ExpandBinOp(Instruction::And, Op0, Op1, Instruction::Xor,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// Or distributes over And. Try some generic simplifications based on this.
if (Value *V = FactorizeBinOp(Instruction::And, Op0, Op1, Instruction::Or,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// If the operation is with the result of a select instruction, check whether
// operating on either branch of the select always yields the same value.
if (isa<SelectInst>(Op0) || isa<SelectInst>(Op1))
- if (Value *V = ThreadBinOpOverSelect(Instruction::And, Op0, Op1, TD, DT,
+ if (Value *V = ThreadBinOpOverSelect(Instruction::And, Op0, Op1, Q,
MaxRecurse))
return V;
// If the operation is with the result of a phi instruction, check whether
// operating on all incoming values of the phi always yields the same value.
if (isa<PHINode>(Op0) || isa<PHINode>(Op1))
- if (Value *V = ThreadBinOpOverPHI(Instruction::And, Op0, Op1, TD, DT,
+ if (Value *V = ThreadBinOpOverPHI(Instruction::And, Op0, Op1, Q,
MaxRecurse))
return V;
return 0;
}
-Value *llvm::SimplifyAndInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyAndInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyAndInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyAndInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyOrInst - Given operands for an Or, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifyOrInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
+static Value *SimplifyOrInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { CLHS, CRHS };
return ConstantFoldInstOperands(Instruction::Or, CLHS->getType(),
- Ops, TD);
+ Ops, Q.TD, Q.TLI);
}
// Canonicalize the constant to the RHS.
return Constant::getAllOnesValue(Op0->getType());
// Try some generic simplifications for associative operations.
- if (Value *V = SimplifyAssociativeBinOp(Instruction::Or, Op0, Op1, TD, DT,
+ if (Value *V = SimplifyAssociativeBinOp(Instruction::Or, Op0, Op1, Q,
MaxRecurse))
return V;
// Or distributes over And. Try some generic simplifications based on this.
- if (Value *V = ExpandBinOp(Instruction::Or, Op0, Op1, Instruction::And,
- TD, DT, MaxRecurse))
+ if (Value *V = ExpandBinOp(Instruction::Or, Op0, Op1, Instruction::And, Q,
+ MaxRecurse))
return V;
// And distributes over Or. Try some generic simplifications based on this.
if (Value *V = FactorizeBinOp(Instruction::Or, Op0, Op1, Instruction::And,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// If the operation is with the result of a select instruction, check whether
// operating on either branch of the select always yields the same value.
if (isa<SelectInst>(Op0) || isa<SelectInst>(Op1))
- if (Value *V = ThreadBinOpOverSelect(Instruction::Or, Op0, Op1, TD, DT,
+ if (Value *V = ThreadBinOpOverSelect(Instruction::Or, Op0, Op1, Q,
MaxRecurse))
return V;
// If the operation is with the result of a phi instruction, check whether
// operating on all incoming values of the phi always yields the same value.
if (isa<PHINode>(Op0) || isa<PHINode>(Op1))
- if (Value *V = ThreadBinOpOverPHI(Instruction::Or, Op0, Op1, TD, DT,
- MaxRecurse))
+ if (Value *V = ThreadBinOpOverPHI(Instruction::Or, Op0, Op1, Q, MaxRecurse))
return V;
return 0;
}
-Value *llvm::SimplifyOrInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyOrInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyOrInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyOrInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyXorInst - Given operands for a Xor, see if we can
/// fold the result. If not, this returns null.
-static Value *SimplifyXorInst(Value *Op0, Value *Op1, const TargetData *TD,
- const DominatorTree *DT, unsigned MaxRecurse) {
+static Value *SimplifyXorInst(Value *Op0, Value *Op1, const Query &Q,
+ unsigned MaxRecurse) {
if (Constant *CLHS = dyn_cast<Constant>(Op0)) {
if (Constant *CRHS = dyn_cast<Constant>(Op1)) {
Constant *Ops[] = { CLHS, CRHS };
return ConstantFoldInstOperands(Instruction::Xor, CLHS->getType(),
- Ops, TD);
+ Ops, Q.TD, Q.TLI);
}
// Canonicalize the constant to the RHS.
return Constant::getAllOnesValue(Op0->getType());
// Try some generic simplifications for associative operations.
- if (Value *V = SimplifyAssociativeBinOp(Instruction::Xor, Op0, Op1, TD, DT,
+ if (Value *V = SimplifyAssociativeBinOp(Instruction::Xor, Op0, Op1, Q,
MaxRecurse))
return V;
// And distributes over Xor. Try some generic simplifications based on this.
if (Value *V = FactorizeBinOp(Instruction::Xor, Op0, Op1, Instruction::And,
- TD, DT, MaxRecurse))
+ Q, MaxRecurse))
return V;
// Threading Xor over selects and phi nodes is pointless, so don't bother.
return 0;
}
-Value *llvm::SimplifyXorInst(Value *Op0, Value *Op1, const TargetData *TD,
+Value *llvm::SimplifyXorInst(Value *Op0, Value *Op1, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
- return ::SimplifyXorInst(Op0, Op1, TD, DT, RecursionLimit);
+ return ::SimplifyXorInst(Op0, Op1, Query (TD, TLI, DT), RecursionLimit);
}
static Type *GetCompareTy(Value *Op) {
return 0;
}
+// A significant optimization not implemented here is assuming that alloca
+// addresses are not equal to incoming argument values. They don't *alias*,
+// as we say, but that doesn't mean they aren't equal, so we take a
+// conservative approach.
+//
+// This is inspired in part by C++11 5.10p1:
+// "Two pointers of the same type compare equal if and only if they are both
+// null, both point to the same function, or both represent the same
+// address."
+//
+// This is pretty permissive.
+//
+// It's also partly due to C11 6.5.9p6:
+// "Two pointers compare equal if and only if both are null pointers, both are
+// pointers to the same object (including a pointer to an object and a
+// subobject at its beginning) or function, both are pointers to one past the
+// last element of the same array object, or one is a pointer to one past the
+// end of one array object and the other is a pointer to the start of a
+// different array object that happens to immediately follow the first array
+// object in the address space.)
+//
+// C11's version is more restrictive, however there's no reason why an argument
+// couldn't be a one-past-the-end value for a stack object in the caller and be
+// equal to the beginning of a stack object in the callee.
+//
+// If the C and C++ standards are ever made sufficiently restrictive in this
+// area, it may be possible to update LLVM's semantics accordingly and reinstate
+// this optimization.
+static Constant *computePointerICmp(const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ CmpInst::Predicate Pred,
+ Value *LHS, Value *RHS) {
+ // First, skip past any trivial no-ops.
+ LHS = LHS->stripPointerCasts();
+ RHS = RHS->stripPointerCasts();
+
+ // A non-null pointer is not equal to a null pointer.
+ if (llvm::isKnownNonNull(LHS) && isa<ConstantPointerNull>(RHS) &&
+ (Pred == CmpInst::ICMP_EQ || Pred == CmpInst::ICMP_NE))
+ return ConstantInt::get(GetCompareTy(LHS),
+ !CmpInst::isTrueWhenEqual(Pred));
+
+ // We can only fold certain predicates on pointer comparisons.
+ switch (Pred) {
+ default:
+ return 0;
+
+ // Equality comaprisons are easy to fold.
+ case CmpInst::ICMP_EQ:
+ case CmpInst::ICMP_NE:
+ break;
+
+ // We can only handle unsigned relational comparisons because 'inbounds' on
+ // a GEP only protects against unsigned wrapping.
+ case CmpInst::ICMP_UGT:
+ case CmpInst::ICMP_UGE:
+ case CmpInst::ICMP_ULT:
+ case CmpInst::ICMP_ULE:
+ // However, we have to switch them to their signed variants to handle
+ // negative indices from the base pointer.
+ Pred = ICmpInst::getSignedPredicate(Pred);
+ break;
+ }
+
+ // Strip off any constant offsets so that we can reason about them.
+ // It's tempting to use getUnderlyingObject or even just stripInBoundsOffsets
+ // here and compare base addresses like AliasAnalysis does, however there are
+ // numerous hazards. AliasAnalysis and its utilities rely on special rules
+ // governing loads and stores which don't apply to icmps. Also, AliasAnalysis
+ // doesn't need to guarantee pointer inequality when it says NoAlias.
+ Constant *LHSOffset = stripAndComputeConstantOffsets(TD, LHS);
+ Constant *RHSOffset = stripAndComputeConstantOffsets(TD, RHS);
+
+ // If LHS and RHS are related via constant offsets to the same base
+ // value, we can replace it with an icmp which just compares the offsets.
+ if (LHS == RHS)
+ return ConstantExpr::getICmp(Pred, LHSOffset, RHSOffset);
+
+ // Various optimizations for (in)equality comparisons.
+ if (Pred == CmpInst::ICMP_EQ || Pred == CmpInst::ICMP_NE) {
+ // Different non-empty allocations that exist at the same time have
+ // different addresses (if the program can tell). Global variables always
+ // exist, so they always exist during the lifetime of each other and all
+ // allocas. Two different allocas usually have different addresses...
+ //
+ // However, if there's an @llvm.stackrestore dynamically in between two
+ // allocas, they may have the same address. It's tempting to reduce the
+ // scope of the problem by only looking at *static* allocas here. That would
+ // cover the majority of allocas while significantly reducing the likelihood
+ // of having an @llvm.stackrestore pop up in the middle. However, it's not
+ // actually impossible for an @llvm.stackrestore to pop up in the middle of
+ // an entry block. Also, if we have a block that's not attached to a
+ // function, we can't tell if it's "static" under the current definition.
+ // Theoretically, this problem could be fixed by creating a new kind of
+ // instruction kind specifically for static allocas. Such a new instruction
+ // could be required to be at the top of the entry block, thus preventing it
+ // from being subject to a @llvm.stackrestore. Instcombine could even
+ // convert regular allocas into these special allocas. It'd be nifty.
+ // However, until then, this problem remains open.
+ //
+ // So, we'll assume that two non-empty allocas have different addresses
+ // for now.
+ //
+ // With all that, if the offsets are within the bounds of their allocations
+ // (and not one-past-the-end! so we can't use inbounds!), and their
+ // allocations aren't the same, the pointers are not equal.
+ //
+ // Note that it's not necessary to check for LHS being a global variable
+ // address, due to canonicalization and constant folding.
+ if (isa<AllocaInst>(LHS) &&
+ (isa<AllocaInst>(RHS) || isa<GlobalVariable>(RHS))) {
+ ConstantInt *LHSOffsetCI = dyn_cast<ConstantInt>(LHSOffset);
+ ConstantInt *RHSOffsetCI = dyn_cast<ConstantInt>(RHSOffset);
+ uint64_t LHSSize, RHSSize;
+ if (LHSOffsetCI && RHSOffsetCI &&
+ getObjectSize(LHS, LHSSize, TD, TLI) &&
+ getObjectSize(RHS, RHSSize, TD, TLI)) {
+ const APInt &LHSOffsetValue = LHSOffsetCI->getValue();
+ const APInt &RHSOffsetValue = RHSOffsetCI->getValue();
+ if (!LHSOffsetValue.isNegative() &&
+ !RHSOffsetValue.isNegative() &&
+ LHSOffsetValue.ult(LHSSize) &&
+ RHSOffsetValue.ult(RHSSize)) {
+ return ConstantInt::get(GetCompareTy(LHS),
+ !CmpInst::isTrueWhenEqual(Pred));
+ }
+ }
+
+ // Repeat the above check but this time without depending on DataLayout
+ // or being able to compute a precise size.
+ if (!cast<PointerType>(LHS->getType())->isEmptyTy() &&
+ !cast<PointerType>(RHS->getType())->isEmptyTy() &&
+ LHSOffset->isNullValue() &&
+ RHSOffset->isNullValue())
+ return ConstantInt::get(GetCompareTy(LHS),
+ !CmpInst::isTrueWhenEqual(Pred));
+ }
+ }
+
+ // Otherwise, fail.
+ return 0;
+}
+
/// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
CmpInst::Predicate Pred = (CmpInst::Predicate)Predicate;
assert(CmpInst::isIntPredicate(Pred) && "Not an integer compare!");
if (Constant *CLHS = dyn_cast<Constant>(LHS)) {
if (Constant *CRHS = dyn_cast<Constant>(RHS))
- return ConstantFoldCompareInstOperands(Pred, CLHS, CRHS, TD);
+ return ConstantFoldCompareInstOperands(Pred, CLHS, CRHS, Q.TD, Q.TLI);
// If we have a constant, make sure it is on the RHS.
std::swap(LHS, RHS);
return ConstantInt::get(ITy, CmpInst::isTrueWhenEqual(Pred));
// Special case logic when the operands have i1 type.
- if (OpTy->isIntegerTy(1) || (OpTy->isVectorTy() &&
- cast<VectorType>(OpTy)->getElementType()->isIntegerTy(1))) {
+ if (OpTy->getScalarType()->isIntegerTy(1)) {
switch (Pred) {
default: break;
case ICmpInst::ICMP_EQ:
}
}
- // icmp <alloca*>, <global/alloca*/null> - Different stack variables have
- // different addresses, and what's more the address of a stack variable is
- // never null or equal to the address of a global. Note that generalizing
- // to the case where LHS is a global variable address or null is pointless,
- // since if both LHS and RHS are constants then we already constant folded
- // the compare, and if only one of them is then we moved it to RHS already.
- if (isa<AllocaInst>(LHS) && (isa<GlobalValue>(RHS) || isa<AllocaInst>(RHS) ||
- isa<ConstantPointerNull>(RHS)))
- // We already know that LHS != RHS.
- return ConstantInt::get(ITy, CmpInst::isFalseWhenEqual(Pred));
-
// If we are comparing with zero then try hard since this is a common case.
if (match(RHS, m_Zero())) {
bool LHSKnownNonNegative, LHSKnownNegative;
switch (Pred) {
- default:
- assert(false && "Unknown ICmp predicate!");
+ default: llvm_unreachable("Unknown ICmp predicate!");
case ICmpInst::ICMP_ULT:
return getFalse(ITy);
case ICmpInst::ICMP_UGE:
return getTrue(ITy);
case ICmpInst::ICMP_EQ:
case ICmpInst::ICMP_ULE:
- if (isKnownNonZero(LHS, TD))
+ if (isKnownNonZero(LHS, Q.TD))
return getFalse(ITy);
break;
case ICmpInst::ICMP_NE:
case ICmpInst::ICMP_UGT:
- if (isKnownNonZero(LHS, TD))
+ if (isKnownNonZero(LHS, Q.TD))
return getTrue(ITy);
break;
case ICmpInst::ICMP_SLT:
- ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
+ ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, Q.TD);
if (LHSKnownNegative)
return getTrue(ITy);
if (LHSKnownNonNegative)
return getFalse(ITy);
break;
case ICmpInst::ICMP_SLE:
- ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
+ ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, Q.TD);
if (LHSKnownNegative)
return getTrue(ITy);
- if (LHSKnownNonNegative && isKnownNonZero(LHS, TD))
+ if (LHSKnownNonNegative && isKnownNonZero(LHS, Q.TD))
return getFalse(ITy);
break;
case ICmpInst::ICMP_SGE:
- ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
+ ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, Q.TD);
if (LHSKnownNegative)
return getFalse(ITy);
if (LHSKnownNonNegative)
return getTrue(ITy);
break;
case ICmpInst::ICMP_SGT:
- ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
+ ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, Q.TD);
if (LHSKnownNegative)
return getFalse(ITy);
- if (LHSKnownNonNegative && isKnownNonZero(LHS, TD))
+ if (LHSKnownNonNegative && isKnownNonZero(LHS, Q.TD))
return getTrue(ITy);
break;
}
Lower = (-Upper) + 1;
} else if (match(LHS, m_UDiv(m_ConstantInt(CI2), m_Value()))) {
// 'udiv CI2, x' produces [0, CI2].
- Upper = CI2->getValue();
+ Upper = CI2->getValue() + 1;
} else if (match(LHS, m_UDiv(m_Value(), m_ConstantInt(CI2)))) {
// 'udiv x, CI2' produces [0, UINT_MAX / CI2].
APInt NegOne = APInt::getAllOnesValue(Width);
// Turn icmp (ptrtoint x), (ptrtoint/constant) into a compare of the input
// if the integer type is the same size as the pointer type.
- if (MaxRecurse && TD && isa<PtrToIntInst>(LI) &&
- TD->getPointerSizeInBits() == DstTy->getPrimitiveSizeInBits()) {
+ if (MaxRecurse &&
Q.TD && isa<PtrToIntInst>(LI) &&
+ Q.TD->getPointerSizeInBits() == DstTy->getPrimitiveSizeInBits()) {
if (Constant *RHSC = dyn_cast<Constant>(RHS)) {
// Transfer the cast to the constant.
if (Value *V = SimplifyICmpInst(Pred, SrcOp,
ConstantExpr::getIntToPtr(RHSC, SrcTy),
- TD, DT, MaxRecurse-1))
+ Q, MaxRecurse-1))
return V;
} else if (PtrToIntInst *RI = dyn_cast<PtrToIntInst>(RHS)) {
if (RI->getOperand(0)->getType() == SrcTy)
// Compare without the cast.
if (Value *V = SimplifyICmpInst(Pred, SrcOp, RI->getOperand(0),
- TD, DT, MaxRecurse-1))
+ Q, MaxRecurse-1))
return V;
}
}
if (MaxRecurse && SrcTy == RI->getOperand(0)->getType())
// Compare X and Y. Note that signed predicates become unsigned.
if (Value *V = SimplifyICmpInst(ICmpInst::getUnsignedPredicate(Pred),
- SrcOp, RI->getOperand(0), TD, DT,
+ SrcOp, RI->getOperand(0), Q,
MaxRecurse-1))
return V;
}
// also a case of comparing two zero-extended values.
if (RExt == CI && MaxRecurse)
if (Value *V = SimplifyICmpInst(ICmpInst::getUnsignedPredicate(Pred),
- SrcOp, Trunc, TD, DT, MaxRecurse-1))
+ SrcOp, Trunc, Q, MaxRecurse-1))
return V;
// Otherwise the upper bits of LHS are zero while RHS has a non-zero bit
// there. Use this to work out the result of the comparison.
if (RExt != CI) {
switch (Pred) {
- default:
- assert(false && "Unknown ICmp predicate!");
+ default: llvm_unreachable("Unknown ICmp predicate!");
// LHS <u RHS.
case ICmpInst::ICMP_EQ:
case ICmpInst::ICMP_UGT:
if (MaxRecurse && SrcTy == RI->getOperand(0)->getType())
// Compare X and Y. Note that the predicate does not change.
if (Value *V = SimplifyICmpInst(Pred, SrcOp, RI->getOperand(0),
- TD, DT, MaxRecurse-1))
+ Q, MaxRecurse-1))
return V;
}
// Turn icmp (sext X), Cst into a compare of X and Cst if Cst is extended
// If the re-extended constant didn't change then this is effectively
// also a case of comparing two sign-extended values.
if (RExt == CI && MaxRecurse)
- if (Value *V = SimplifyICmpInst(Pred, SrcOp, Trunc, TD, DT,
- MaxRecurse-1))
+ if (Value *V = SimplifyICmpInst(Pred, SrcOp, Trunc, Q, MaxRecurse-1))
return V;
// Otherwise the upper bits of LHS are all equal, while RHS has varying
// bits there. Use this to work out the result of the comparison.
if (RExt != CI) {
switch (Pred) {
- default:
- assert(false && "Unknown ICmp predicate!");
+ default: llvm_unreachable("Unknown ICmp predicate!");
case ICmpInst::ICMP_EQ:
return ConstantInt::getFalse(CI->getContext());
case ICmpInst::ICMP_NE:
if (MaxRecurse)
if (Value *V = SimplifyICmpInst(ICmpInst::ICMP_SLT, SrcOp,
Constant::getNullValue(SrcTy),
- TD, DT, MaxRecurse-1))
+ Q, MaxRecurse-1))
return V;
break;
case ICmpInst::ICMP_ULT:
if (MaxRecurse)
if (Value *V = SimplifyICmpInst(ICmpInst::ICMP_SGE, SrcOp,
Constant::getNullValue(SrcTy),
- TD, DT, MaxRecurse-1))
+ Q, MaxRecurse-1))
return V;
break;
}
if ((A == RHS || B == RHS) && NoLHSWrapProblem)
if (Value *V = SimplifyICmpInst(Pred, A == RHS ? B : A,
Constant::getNullValue(RHS->getType()),
- TD, DT, MaxRecurse-1))
+ Q, MaxRecurse-1))
return V;
// icmp X, (X+Y) -> icmp 0, Y for equalities or if there is no overflow.
if ((C == LHS || D == LHS) && NoRHSWrapProblem)
if (Value *V = SimplifyICmpInst(Pred,
Constant::getNullValue(LHS->getType()),
- C == LHS ? D : C, TD, DT, MaxRecurse-1))
+ C == LHS ? D : C, Q, MaxRecurse-1))
return V;
// icmp (X+Y), (X+Z) -> icmp Y,Z for equalities or if there is no overflow.
if (A && C && (A == C || A == D || B == C || B == D) &&
NoLHSWrapProblem && NoRHSWrapProblem) {
// Determine Y and Z in the form icmp (X+Y), (X+Z).
- Value *Y = (A == C || A == D) ? B : A;
- Value *Z = (C == A || C == B) ? D : C;
- if (Value *V = SimplifyICmpInst(Pred, Y, Z, TD, DT, MaxRecurse-1))
+ Value *Y, *Z;
+ if (A == C) {
+ // C + B == C + D -> B == D
+ Y = B;
+ Z = D;
+ } else if (A == D) {
+ // D + B == C + D -> B == C
+ Y = B;
+ Z = C;
+ } else if (B == C) {
+ // A + C == C + D -> A == D
+ Y = A;
+ Z = D;
+ } else {
+ assert(B == D);
+ // A + D == C + D -> A == C
+ Y = A;
+ Z = C;
+ }
+ if (Value *V = SimplifyICmpInst(Pred, Y, Z, Q, MaxRecurse-1))
return V;
}
}
+ // icmp pred (urem X, Y), Y
if (LBO && match(LBO, m_URem(m_Value(), m_Specific(RHS)))) {
bool KnownNonNegative, KnownNegative;
switch (Pred) {
break;
case ICmpInst::ICMP_SGT:
case ICmpInst::ICMP_SGE:
- ComputeSignBit(LHS, KnownNonNegative, KnownNegative, TD);
+ ComputeSignBit(RHS, KnownNonNegative, KnownNegative, Q.TD);
if (!KnownNonNegative)
break;
// fall-through
return getFalse(ITy);
case ICmpInst::ICMP_SLT:
case ICmpInst::ICMP_SLE:
- ComputeSignBit(LHS, KnownNonNegative, KnownNegative, TD);
+ ComputeSignBit(RHS, KnownNonNegative, KnownNegative, Q.TD);
if (!KnownNonNegative)
break;
// fall-through
return getTrue(ITy);
}
}
+
+ // icmp pred X, (urem Y, X)
if (RBO && match(RBO, m_URem(m_Value(), m_Specific(LHS)))) {
bool KnownNonNegative, KnownNegative;
switch (Pred) {
break;
case ICmpInst::ICMP_SGT:
case ICmpInst::ICMP_SGE:
- ComputeSignBit(RHS, KnownNonNegative, KnownNegative, TD);
+ ComputeSignBit(LHS, KnownNonNegative, KnownNegative, Q.TD);
if (!KnownNonNegative)
break;
// fall-through
return getTrue(ITy);
case ICmpInst::ICMP_SLT:
case ICmpInst::ICMP_SLE:
- ComputeSignBit(RHS, KnownNonNegative, KnownNegative, TD);
+ ComputeSignBit(LHS, KnownNonNegative, KnownNegative, Q.TD);
if (!KnownNonNegative)
break;
// fall-through
if (!LBO->isExact() || !RBO->isExact())
break;
if (Value *V = SimplifyICmpInst(Pred, LBO->getOperand(0),
- RBO->getOperand(0), TD, DT, MaxRecurse-1))
+ RBO->getOperand(0), Q, MaxRecurse-1))
return V;
break;
case Instruction::Shl: {
if (!NSW && ICmpInst::isSigned(Pred))
break;
if (Value *V = SimplifyICmpInst(Pred, LBO->getOperand(0),
- RBO->getOperand(0), TD, DT, MaxRecurse-1))
+ RBO->getOperand(0), Q, MaxRecurse-1))
return V;
break;
}
return V;
// Otherwise, see if "A EqP B" simplifies.
if (MaxRecurse)
- if (Value *V = SimplifyICmpInst(EqP, A, B, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyICmpInst(EqP, A, B, Q, MaxRecurse-1))
return V;
break;
case CmpInst::ICMP_NE:
return V;
// Otherwise, see if "A InvEqP B" simplifies.
if (MaxRecurse)
- if (Value *V = SimplifyICmpInst(InvEqP, A, B, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyICmpInst(InvEqP, A, B, Q, MaxRecurse-1))
return V;
break;
}
return V;
// Otherwise, see if "A EqP B" simplifies.
if (MaxRecurse)
- if (Value *V = SimplifyICmpInst(EqP, A, B, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyICmpInst(EqP, A, B, Q, MaxRecurse-1))
return V;
break;
case CmpInst::ICMP_NE:
return V;
// Otherwise, see if "A InvEqP B" simplifies.
if (MaxRecurse)
- if (Value *V = SimplifyICmpInst(InvEqP, A, B, TD, DT, MaxRecurse-1))
+ if (Value *V = SimplifyICmpInst(InvEqP, A, B, Q, MaxRecurse-1))
return V;
break;
}
return getFalse(ITy);
}
+ // Simplify comparisons of related pointers using a powerful, recursive
+ // GEP-walk when we have target data available..
+ if (LHS->getType()->isPointerTy())
+ if (Constant *C = computePointerICmp(Q.TD, Q.TLI, Pred, LHS, RHS))
+ return C;
+
+ if (GetElementPtrInst *GLHS = dyn_cast<GetElementPtrInst>(LHS)) {
+ if (GEPOperator *GRHS = dyn_cast<GEPOperator>(RHS)) {
+ if (GLHS->getPointerOperand() == GRHS->getPointerOperand() &&
+ GLHS->hasAllConstantIndices() && GRHS->hasAllConstantIndices() &&
+ (ICmpInst::isEquality(Pred) ||
+ (GLHS->isInBounds() && GRHS->isInBounds() &&
+ Pred == ICmpInst::getSignedPredicate(Pred)))) {
+ // The bases are equal and the indices are constant. Build a constant
+ // expression GEP with the same indices and a null base pointer to see
+ // what constant folding can make out of it.
+ Constant *Null = Constant::getNullValue(GLHS->getPointerOperandType());
+ SmallVector<Value *, 4> IndicesLHS(GLHS->idx_begin(), GLHS->idx_end());
+ Constant *NewLHS = ConstantExpr::getGetElementPtr(Null, IndicesLHS);
+
+ SmallVector<Value *, 4> IndicesRHS(GRHS->idx_begin(), GRHS->idx_end());
+ Constant *NewRHS = ConstantExpr::getGetElementPtr(Null, IndicesRHS);
+ return ConstantExpr::getICmp(Pred, NewLHS, NewRHS);
+ }
+ }
+ }
+
// If the comparison is with the result of a select instruction, check whether
// comparing with either branch of the select always yields the same value.
if (isa<SelectInst>(LHS) || isa<SelectInst>(RHS))
- if (Value *V = ThreadCmpOverSelect(Pred, LHS, RHS, TD, DT, MaxRecurse))
+ if (Value *V = ThreadCmpOverSelect(Pred, LHS, RHS, Q, MaxRecurse))
return V;
// If the comparison is with the result of a phi instruction, check whether
// doing the compare with each incoming phi value yields a common result.
if (isa<PHINode>(LHS) || isa<PHINode>(RHS))
- if (Value *V = ThreadCmpOverPHI(Pred, LHS, RHS, TD, DT, MaxRecurse))
+ if (Value *V = ThreadCmpOverPHI(Pred, LHS, RHS, Q, MaxRecurse))
return V;
return 0;
}
Value *llvm::SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyICmpInst(Predicate, LHS, RHS, TD, DT, RecursionLimit);
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyICmpInst(Predicate, LHS, RHS, Query (TD, TLI, DT),
+ RecursionLimit);
}
/// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
CmpInst::Predicate Pred = (CmpInst::Predicate)Predicate;
assert(CmpInst::isFPPredicate(Pred) && "Not an FP compare!");
if (Constant *CLHS = dyn_cast<Constant>(LHS)) {
if (Constant *CRHS = dyn_cast<Constant>(RHS))
- return ConstantFoldCompareInstOperands(Pred, CLHS, CRHS, TD);
+ return ConstantFoldCompareInstOperands(Pred, CLHS, CRHS, Q.TD, Q.TLI);
// If we have a constant, make sure it is on the RHS.
std::swap(LHS, RHS);
// If the comparison is with the result of a select instruction, check whether
// comparing with either branch of the select always yields the same value.
if (isa<SelectInst>(LHS) || isa<SelectInst>(RHS))
- if (Value *V = ThreadCmpOverSelect(Pred, LHS, RHS, TD, DT, MaxRecurse))
+ if (Value *V = ThreadCmpOverSelect(Pred, LHS, RHS, Q, MaxRecurse))
return V;
// If the comparison is with the result of a phi instruction, check whether
// doing the compare with each incoming phi value yields a common result.
if (isa<PHINode>(LHS) || isa<PHINode>(RHS))
- if (Value *V = ThreadCmpOverPHI(Pred, LHS, RHS, TD, DT, MaxRecurse))
+ if (Value *V = ThreadCmpOverPHI(Pred, LHS, RHS, Q, MaxRecurse))
return V;
return 0;
}
Value *llvm::SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyFCmpInst(Predicate, LHS, RHS, TD, DT, RecursionLimit);
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyFCmpInst(Predicate, LHS, RHS, Query (TD, TLI, DT),
+ RecursionLimit);
}
/// SimplifySelectInst - Given operands for a SelectInst, see if we can fold
/// the result. If not, this returns null.
-Value *llvm::SimplifySelectInst(Value *CondVal, Value *TrueVal, Value *FalseVal,
- const TargetData *TD, const DominatorTree *) {
+static Value *SimplifySelectInst(Value *CondVal, Value *TrueVal,
+ Value *FalseVal, const Query &Q,
+ unsigned MaxRecurse) {
// select true, X, Y -> X
// select false, X, Y -> Y
if (ConstantInt *CB = dyn_cast<ConstantInt>(CondVal))
return 0;
}
+Value *llvm::SimplifySelectInst(Value *Cond, Value *TrueVal, Value *FalseVal,
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifySelectInst(Cond, TrueVal, FalseVal, Query (TD, TLI, DT),
+ RecursionLimit);
+}
+
/// SimplifyGEPInst - Given operands for an GetElementPtrInst, see if we can
/// fold the result. If not, this returns null.
-Value *llvm::SimplifyGEPInst(ArrayRef<Value *> Ops,
- const TargetData *TD, const DominatorTree *) {
+static Value *SimplifyGEPInst(ArrayRef<Value *> Ops, const Query &Q, unsigned) {
// The type of the GEP pointer operand.
- PointerType *PtrTy = cast<PointerType>(Ops[0]->getType());
+ PointerType *PtrTy = dyn_cast<PointerType>(Ops[0]->getType());
+ // The GEP pointer operand is not a pointer, it's a vector of pointers.
+ if (!PtrTy)
+ return 0;
// getelementptr P -> P.
if (Ops.size() == 1)
if (C->isZero())
return Ops[0];
// getelementptr P, N -> P if P points to a type of zero size.
- if (TD) {
+ if (Q.TD) {
Type *Ty = PtrTy->getElementType();
- if (Ty->isSized() && TD->getTypeAllocSize(Ty) == 0)
+ if (Ty->isSized() && Q.TD->getTypeAllocSize(Ty) == 0)
return Ops[0];
}
}
return ConstantExpr::getGetElementPtr(cast<Constant>(Ops[0]), Ops.slice(1));
}
+Value *llvm::SimplifyGEPInst(ArrayRef<Value *> Ops, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyGEPInst(Ops, Query (TD, TLI, DT), RecursionLimit);
+}
+
/// SimplifyInsertValueInst - Given operands for an InsertValueInst, see if we
/// can fold the result. If not, this returns null.
-Value *llvm::SimplifyInsertValueInst(Value *Agg, Value *Val,
- ArrayRef<unsigned> Idxs,
- const TargetData *,
- const DominatorTree *) {
+static Value *SimplifyInsertValueInst(Value *Agg, Value *Val,
+ ArrayRef<unsigned> Idxs, const Query &Q,
+ unsigned) {
if (Constant *CAgg = dyn_cast<Constant>(Agg))
if (Constant *CVal = dyn_cast<Constant>(Val))
return ConstantFoldInsertValueInstruction(CAgg, CVal, Idxs);
return 0;
}
+Value *llvm::SimplifyInsertValueInst(Value *Agg, Value *Val,
+ ArrayRef<unsigned> Idxs,
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyInsertValueInst(Agg, Val, Idxs, Query (TD, TLI, DT),
+ RecursionLimit);
+}
+
/// SimplifyPHINode - See if we can fold the given phi. If not, returns null.
-static Value *SimplifyPHINode(PHINode *PN, const DominatorTree *DT) {
+static Value *SimplifyPHINode(PHINode *PN, const Query &Q) {
// If all of the PHI's incoming values are the same then replace the PHI node
// with the common value.
Value *CommonValue = 0;
// instruction, we cannot return X as the result of the PHI node unless it
// dominates the PHI block.
if (HasUndefInput)
- return ValueDominatesPHI(CommonValue, PN, DT) ? CommonValue : 0;
+ return ValueDominatesPHI(CommonValue, PN, Q.DT) ? CommonValue : 0;
return CommonValue;
}
+static Value *SimplifyTruncInst(Value *Op, Type *Ty, const Query &Q, unsigned) {
+ if (Constant *C = dyn_cast<Constant>(Op))
+ return ConstantFoldInstOperands(Instruction::Trunc, Ty, C, Q.TD, Q.TLI);
+
+ return 0;
+}
+
+Value *llvm::SimplifyTruncInst(Value *Op, Type *Ty, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyTruncInst(Op, Ty, Query (TD, TLI, DT), RecursionLimit);
+}
//=== Helper functions for higher up the class hierarchy.
/// SimplifyBinOp - Given operands for a BinaryOperator, see if we can
/// fold the result. If not, this returns null.
static Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
switch (Opcode) {
case Instruction::Add:
return SimplifyAddInst(LHS, RHS, /*isNSW*/false, /*isNUW*/false,
- TD, DT, MaxRecurse);
+ Q, MaxRecurse);
+ case Instruction::FAdd:
+ return SimplifyFAddInst(LHS, RHS, FastMathFlags(), Q, MaxRecurse);
+
case Instruction::Sub:
return SimplifySubInst(LHS, RHS, /*isNSW*/false, /*isNUW*/false,
- TD, DT, MaxRecurse);
- case Instruction::Mul: return SimplifyMulInst (LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::SDiv: return SimplifySDivInst(LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::UDiv: return SimplifyUDivInst(LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::FDiv: return SimplifyFDivInst(LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::SRem: return SimplifySRemInst(LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::URem: return SimplifyURemInst(LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::FRem: return SimplifyFRemInst(LHS, RHS, TD, DT, MaxRecurse);
+ Q, MaxRecurse);
+ case Instruction::FSub:
+ return SimplifyFSubInst(LHS, RHS, FastMathFlags(), Q, MaxRecurse);
+
+ case Instruction::Mul: return SimplifyMulInst (LHS, RHS, Q, MaxRecurse);
+ case Instruction::FMul:
+ return SimplifyFMulInst (LHS, RHS, FastMathFlags(), Q, MaxRecurse);
+ case Instruction::SDiv: return SimplifySDivInst(LHS, RHS, Q, MaxRecurse);
+ case Instruction::UDiv: return SimplifyUDivInst(LHS, RHS, Q, MaxRecurse);
+ case Instruction::FDiv: return SimplifyFDivInst(LHS, RHS, Q, MaxRecurse);
+ case Instruction::SRem: return SimplifySRemInst(LHS, RHS, Q, MaxRecurse);
+ case Instruction::URem: return SimplifyURemInst(LHS, RHS, Q, MaxRecurse);
+ case Instruction::FRem: return SimplifyFRemInst(LHS, RHS, Q, MaxRecurse);
case Instruction::Shl:
return SimplifyShlInst(LHS, RHS, /*isNSW*/false, /*isNUW*/false,
- TD, DT, MaxRecurse);
+ Q, MaxRecurse);
case Instruction::LShr:
- return SimplifyLShrInst(LHS, RHS, /*isExact*/false, TD, DT, MaxRecurse);
+ return SimplifyLShrInst(LHS, RHS, /*isExact*/false, Q, MaxRecurse);
case Instruction::AShr:
- return SimplifyAShrInst(LHS, RHS, /*isExact*/false, TD, DT, MaxRecurse);
- case Instruction::And: return SimplifyAndInst(LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::Or: return SimplifyOrInst (LHS, RHS, TD, DT, MaxRecurse);
- case Instruction::Xor: return SimplifyXorInst(LHS, RHS, TD, DT, MaxRecurse);
+ return SimplifyAShrInst(LHS, RHS, /*isExact*/false, Q, MaxRecurse);
+ case Instruction::And: return SimplifyAndInst(LHS, RHS, Q, MaxRecurse);
+ case Instruction::Or: return SimplifyOrInst (LHS, RHS, Q, MaxRecurse);
+ case Instruction::Xor: return SimplifyXorInst(LHS, RHS, Q, MaxRecurse);
default:
if (Constant *CLHS = dyn_cast<Constant>(LHS))
if (Constant *CRHS = dyn_cast<Constant>(RHS)) {
Constant *COps[] = {CLHS, CRHS};
- return ConstantFoldInstOperands(Opcode, LHS->getType(), COps, TD);
+ return ConstantFoldInstOperands(Opcode, LHS->getType(), COps, Q.TD,
+ Q.TLI);
}
// If the operation is associative, try some generic simplifications.
if (Instruction::isAssociative(Opcode))
- if (Value *V = SimplifyAssociativeBinOp(Opcode, LHS, RHS, TD, DT,
- MaxRecurse))
+ if (Value *V = SimplifyAssociativeBinOp(Opcode, LHS, RHS, Q, MaxRecurse))
return V;
- // If the operation is with the result of a select instruction, check whether
+ // If the operation is with the result of a select instruction check whether
// operating on either branch of the select always yields the same value.
if (isa<SelectInst>(LHS) || isa<SelectInst>(RHS))
- if (Value *V = ThreadBinOpOverSelect(Opcode, LHS, RHS, TD, DT,
- MaxRecurse))
+ if (Value *V = ThreadBinOpOverSelect(Opcode, LHS, RHS, Q, MaxRecurse))
return V;
// If the operation is with the result of a phi instruction, check whether
// operating on all incoming values of the phi always yields the same value.
if (isa<PHINode>(LHS) || isa<PHINode>(RHS))
- if (Value *V = ThreadBinOpOverPHI(Opcode, LHS, RHS, TD, DT, MaxRecurse))
+ if (Value *V = ThreadBinOpOverPHI(Opcode, LHS, RHS, Q, MaxRecurse))
return V;
return 0;
}
Value *llvm::SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyBinOp(Opcode, LHS, RHS, TD, DT, RecursionLimit);
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyBinOp(Opcode, LHS, RHS, Query (TD, TLI, DT), RecursionLimit);
}
/// SimplifyCmpInst - Given operands for a CmpInst, see if we can
/// fold the result.
static Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT,
- unsigned MaxRecurse) {
+ const Query &Q, unsigned MaxRecurse) {
if (CmpInst::isIntPredicate((CmpInst::Predicate)Predicate))
- return SimplifyICmpInst(Predicate, LHS, RHS, TD, DT, MaxRecurse);
- return SimplifyFCmpInst(Predicate, LHS, RHS, TD, DT, MaxRecurse);
+ return SimplifyICmpInst(Predicate, LHS, RHS, Q, MaxRecurse);
+ return SimplifyFCmpInst(Predicate, LHS, RHS, Q, MaxRecurse);
}
Value *llvm::SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
- const TargetData *TD, const DominatorTree *DT) {
- return ::SimplifyCmpInst(Predicate, LHS, RHS, TD, DT, RecursionLimit);
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyCmpInst(Predicate, LHS, RHS, Query (TD, TLI, DT),
+ RecursionLimit);
}
-static Value *SimplifyCallInst(CallInst *CI) {
- // call undef -> undef
- if (isa<UndefValue>(CI->getCalledValue()))
- return UndefValue::get(CI->getType());
+static bool IsIdempotent(Intrinsic::ID ID) {
+ switch (ID) {
+ default: return false;
+
+ // Unary idempotent: f(f(x)) = f(x)
+ case Intrinsic::fabs:
+ case Intrinsic::floor:
+ case Intrinsic::ceil:
+ case Intrinsic::trunc:
+ case Intrinsic::rint:
+ case Intrinsic::nearbyint:
+ return true;
+ }
+}
+
+template <typename IterTy>
+static Value *SimplifyIntrinsic(Intrinsic::ID IID, IterTy ArgBegin, IterTy ArgEnd,
+ const Query &Q, unsigned MaxRecurse) {
+ // Perform idempotent optimizations
+ if (!IsIdempotent(IID))
+ return 0;
+
+ // Unary Ops
+ if (std::distance(ArgBegin, ArgEnd) == 1)
+ if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(*ArgBegin))
+ if (II->getIntrinsicID() == IID)
+ return II;
return 0;
}
+template <typename IterTy>
+static Value *SimplifyCall(Value *V, IterTy ArgBegin, IterTy ArgEnd,
+ const Query &Q, unsigned MaxRecurse) {
+ Type *Ty = V->getType();
+ if (PointerType *PTy = dyn_cast<PointerType>(Ty))
+ Ty = PTy->getElementType();
+ FunctionType *FTy = cast<FunctionType>(Ty);
+
+ // call undef -> undef
+ if (isa<UndefValue>(V))
+ return UndefValue::get(FTy->getReturnType());
+
+ Function *F = dyn_cast<Function>(V);
+ if (!F)
+ return 0;
+
+ if (unsigned IID = F->getIntrinsicID())
+ if (Value *Ret =
+ SimplifyIntrinsic((Intrinsic::ID) IID, ArgBegin, ArgEnd, Q, MaxRecurse))
+ return Ret;
+
+ if (!canConstantFoldCallTo(F))
+ return 0;
+
+ SmallVector<Constant *, 4> ConstantArgs;
+ ConstantArgs.reserve(ArgEnd - ArgBegin);
+ for (IterTy I = ArgBegin, E = ArgEnd; I != E; ++I) {
+ Constant *C = dyn_cast<Constant>(*I);
+ if (!C)
+ return 0;
+ ConstantArgs.push_back(C);
+ }
+
+ return ConstantFoldCall(F, ConstantArgs, Q.TLI);
+}
+
+Value *llvm::SimplifyCall(Value *V, User::op_iterator ArgBegin,
+ User::op_iterator ArgEnd, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyCall(V, ArgBegin, ArgEnd, Query(TD, TLI, DT),
+ RecursionLimit);
+}
+
+Value *llvm::SimplifyCall(Value *V, ArrayRef<Value *> Args,
+ const DataLayout *TD, const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return ::SimplifyCall(V, Args.begin(), Args.end(), Query(TD, TLI, DT),
+ RecursionLimit);
+}
+
/// SimplifyInstruction - See if we can compute a simplified version of this
/// instruction. If not, this returns null.
-Value *llvm::SimplifyInstruction(Instruction *I, const TargetData *TD,
+Value *llvm::SimplifyInstruction(Instruction *I, const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
const DominatorTree *DT) {
Value *Result;
switch (I->getOpcode()) {
default:
- Result = ConstantFoldInstruction(I, TD);
+ Result = ConstantFoldInstruction(I, TD, TLI);
+ break;
+ case Instruction::FAdd:
+ Result = SimplifyFAddInst(I->getOperand(0), I->getOperand(1),
+ I->getFastMathFlags(), TD, TLI, DT);
break;
case Instruction::Add:
Result = SimplifyAddInst(I->getOperand(0), I->getOperand(1),
cast<BinaryOperator>(I)->hasNoSignedWrap(),
cast<BinaryOperator>(I)->hasNoUnsignedWrap(),
- TD, DT);
+ TD, TLI, DT);
+ break;
+ case Instruction::FSub:
+ Result = SimplifyFSubInst(I->getOperand(0), I->getOperand(1),
+ I->getFastMathFlags(), TD, TLI, DT);
break;
case Instruction::Sub:
Result = SimplifySubInst(I->getOperand(0), I->getOperand(1),
cast<BinaryOperator>(I)->hasNoSignedWrap(),
cast<BinaryOperator>(I)->hasNoUnsignedWrap(),
- TD, DT);
+ TD, TLI, DT);
+ break;
+ case Instruction::FMul:
+ Result = SimplifyFMulInst(I->getOperand(0), I->getOperand(1),
+ I->getFastMathFlags(), TD, TLI, DT);
break;
case Instruction::Mul:
- Result = SimplifyMulInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyMulInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::SDiv:
- Result = SimplifySDivInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifySDivInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::UDiv:
- Result = SimplifyUDivInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyUDivInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::FDiv:
- Result = SimplifyFDivInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyFDivInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::SRem:
- Result = SimplifySRemInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifySRemInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::URem:
- Result = SimplifyURemInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyURemInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::FRem:
- Result = SimplifyFRemInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyFRemInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::Shl:
Result = SimplifyShlInst(I->getOperand(0), I->getOperand(1),
cast<BinaryOperator>(I)->hasNoSignedWrap(),
cast<BinaryOperator>(I)->hasNoUnsignedWrap(),
- TD, DT);
+ TD, TLI, DT);
break;
case Instruction::LShr:
Result = SimplifyLShrInst(I->getOperand(0), I->getOperand(1),
cast<BinaryOperator>(I)->isExact(),
- TD, DT);
+ TD, TLI, DT);
break;
case Instruction::AShr:
Result = SimplifyAShrInst(I->getOperand(0), I->getOperand(1),
cast<BinaryOperator>(I)->isExact(),
- TD, DT);
+ TD, TLI, DT);
break;
case Instruction::And:
- Result = SimplifyAndInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyAndInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::Or:
- Result = SimplifyOrInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyOrInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::Xor:
- Result = SimplifyXorInst(I->getOperand(0), I->getOperand(1), TD, DT);
+ Result = SimplifyXorInst(I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::ICmp:
Result = SimplifyICmpInst(cast<ICmpInst>(I)->getPredicate(),
- I->getOperand(0), I->getOperand(1), TD, DT);
+ I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::FCmp:
Result = SimplifyFCmpInst(cast<FCmpInst>(I)->getPredicate(),
- I->getOperand(0), I->getOperand(1), TD, DT);
+ I->getOperand(0), I->getOperand(1), TD, TLI, DT);
break;
case Instruction::Select:
Result = SimplifySelectInst(I->getOperand(0), I->getOperand(1),
- I->getOperand(2), TD, DT);
+ I->getOperand(2), TD, TLI, DT);
break;
case Instruction::GetElementPtr: {
SmallVector<Value*, 8> Ops(I->op_begin(), I->op_end());
- Result = SimplifyGEPInst(Ops, TD, DT);
+ Result = SimplifyGEPInst(Ops, TD, TLI, DT);
break;
}
case Instruction::InsertValue: {
InsertValueInst *IV = cast<InsertValueInst>(I);
Result = SimplifyInsertValueInst(IV->getAggregateOperand(),
IV->getInsertedValueOperand(),
- IV->getIndices(), TD, DT);
+ IV->getIndices(), TD, TLI, DT);
break;
}
case Instruction::PHI:
- Result = SimplifyPHINode(cast<PHINode>(I), DT);
+ Result = SimplifyPHINode(cast<PHINode>(I), Query (TD, TLI, DT));
break;
- case Instruction::Call:
- Result = SimplifyCallInst(cast<CallInst>(I));
+ case Instruction::Call: {
+ CallSite CS(cast<CallInst>(I));
+ Result = SimplifyCall(CS.getCalledValue(), CS.arg_begin(), CS.arg_end(),
+ TD, TLI, DT);
+ break;
+ }
+ case Instruction::Trunc:
+ Result = SimplifyTruncInst(I->getOperand(0), I->getType(), TD, TLI, DT);
break;
}
return Result == I ? UndefValue::get(I->getType()) : Result;
}
-/// ReplaceAndSimplifyAllUses - Perform From->replaceAllUsesWith(To) and then
-/// delete the From instruction. In addition to a basic RAUW, this does a
-/// recursive simplification of the newly formed instructions. This catches
-/// things where one simplification exposes other opportunities. This only
-/// simplifies and deletes scalar operations, it does not change the CFG.
+/// \brief Implementation of recursive simplification through an instructions
+/// uses.
///
-void llvm::ReplaceAndSimplifyAllUses(Instruction *From, Value *To,
- const TargetData *TD,
- const DominatorTree *DT) {
- assert(From != To && "ReplaceAndSimplifyAllUses(X,X) is not valid!");
-
- // FromHandle/ToHandle - This keeps a WeakVH on the from/to values so that
- // we can know if it gets deleted out from under us or replaced in a
- // recursive simplification.
- WeakVH FromHandle(From);
- WeakVH ToHandle(To);
-
- while (!From->use_empty()) {
- // Update the instruction to use the new value.
- Use &TheUse = From->use_begin().getUse();
- Instruction *User = cast<Instruction>(TheUse.getUser());
- TheUse = To;
-
- // Check to see if the instruction can be folded due to the operand
- // replacement. For example changing (or X, Y) into (or X, -1) can replace
- // the 'or' with -1.
- Value *SimplifiedVal;
- {
- // Sanity check to make sure 'User' doesn't dangle across
- // SimplifyInstruction.
- AssertingVH<> UserHandle(User);
-
- SimplifiedVal = SimplifyInstruction(User, TD, DT);
- if (SimplifiedVal == 0) continue;
- }
+/// This is the common implementation of the recursive simplification routines.
+/// If we have a pre-simplified value in 'SimpleV', that is forcibly used to
+/// replace the instruction 'I'. Otherwise, we simply add 'I' to the list of
+/// instructions to process and attempt to simplify it using
+/// InstructionSimplify.
+///
+/// This routine returns 'true' only when *it* simplifies something. The passed
+/// in simplified value does not count toward this.
+static bool replaceAndRecursivelySimplifyImpl(Instruction *I, Value *SimpleV,
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ bool Simplified = false;
+ SmallSetVector<Instruction *, 8> Worklist;
+
+ // If we have an explicit value to collapse to, do that round of the
+ // simplification loop by hand initially.
+ if (SimpleV) {
+ for (Value::use_iterator UI = I->use_begin(), UE = I->use_end(); UI != UE;
+ ++UI)
+ if (*UI != I)
+ Worklist.insert(cast<Instruction>(*UI));
+
+ // Replace the instruction with its simplified value.
+ I->replaceAllUsesWith(SimpleV);
+
+ // Gracefully handle edge cases where the instruction is not wired into any
+ // parent block.
+ if (I->getParent())
+ I->eraseFromParent();
+ } else {
+ Worklist.insert(I);
+ }
- // Recursively simplify this user to the new value.
- ReplaceAndSimplifyAllUses(User, SimplifiedVal, TD, DT);
- From = dyn_cast_or_null<Instruction>((Value*)FromHandle);
- To = ToHandle;
+ // Note that we must test the size on each iteration, the worklist can grow.
+ for (unsigned Idx = 0; Idx != Worklist.size(); ++Idx) {
+ I = Worklist[Idx];
- assert(ToHandle && "To value deleted by recursive simplification?");
+ // See if this instruction simplifies.
+ SimpleV = SimplifyInstruction(I, TD, TLI, DT);
+ if (!SimpleV)
+ continue;
+
+ Simplified = true;
+
+ // Stash away all the uses of the old instruction so we can check them for
+ // recursive simplifications after a RAUW. This is cheaper than checking all
+ // uses of To on the recursive step in most cases.
+ for (Value::use_iterator UI = I->use_begin(), UE = I->use_end(); UI != UE;
+ ++UI)
+ Worklist.insert(cast<Instruction>(*UI));
- // If the recursive simplification ended up revisiting and deleting
- // 'From' then we're done.
- if (From == 0)
- return;
+ // Replace the instruction with its simplified value.
+ I->replaceAllUsesWith(SimpleV);
+
+ // Gracefully handle edge cases where the instruction is not wired into any
+ // parent block.
+ if (I->getParent())
+ I->eraseFromParent();
}
+ return Simplified;
+}
- // If 'From' has value handles referring to it, do a real RAUW to update them.
- From->replaceAllUsesWith(To);
+bool llvm::recursivelySimplifyInstruction(Instruction *I,
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ return replaceAndRecursivelySimplifyImpl(I, 0, TD, TLI, DT);
+}
- From->eraseFromParent();
+bool llvm::replaceAndRecursivelySimplify(Instruction *I, Value *SimpleV,
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ const DominatorTree *DT) {
+ assert(I != SimpleV && "replaceAndRecursivelySimplify(X,X) is not valid!");
+ assert(SimpleV && "Must provide a simplified value.");
+ return replaceAndRecursivelySimplifyImpl(I, SimpleV, TD, TLI, DT);
}
projects / oota-llvm.git / blobdiff