#include "llvm/Support/CallSite.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Analysis/MemoryBuiltins.h"
+#include "llvm/Transforms/Utils/BuildLibCalls.h"
using namespace llvm;
/// getPromotedType - Return the specified type promoted as it would be to pass
}
Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
- unsigned DstAlign = GetOrEnforceKnownAlignment(MI->getOperand(1));
- unsigned SrcAlign = GetOrEnforceKnownAlignment(MI->getOperand(2));
+ unsigned DstAlign = GetOrEnforceKnownAlignment(MI->getOperand(0));
+ unsigned SrcAlign = GetOrEnforceKnownAlignment(MI->getOperand(1));
unsigned MinAlign = std::min(DstAlign, SrcAlign);
unsigned CopyAlign = MI->getAlignment();
// If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with
// load/store.
- ConstantInt *MemOpLength = dyn_cast<ConstantInt>(MI->getOperand(3));
+ ConstantInt *MemOpLength = dyn_cast<ConstantInt>(MI->getOperand(2));
if (MemOpLength == 0) return 0;
// Source and destination pointer types are always "i8*" for intrinsic. See
return 0; // If not 1/2/4/8 bytes, exit.
// Use an integer load+store unless we can find something better.
- Type *NewPtrTy =
- PointerType::getUnqual(IntegerType::get(MI->getContext(), Size<<3));
+ unsigned SrcAddrSp =
+ cast<PointerType>(MI->getOperand(1)->getType())->getAddressSpace();
+ unsigned DstAddrSp =
+ cast<PointerType>(MI->getOperand(0)->getType())->getAddressSpace();
+
+ const IntegerType* IntType = IntegerType::get(MI->getContext(), Size<<3);
+ Type *NewSrcPtrTy = PointerType::get(IntType, SrcAddrSp);
+ Type *NewDstPtrTy = PointerType::get(IntType, DstAddrSp);
// Memcpy forces the use of i8* for the source and destination. That means
// that if you're using memcpy to move one double around, you'll get a cast
// an i64 load+store, here because this improves the odds that the source or
// dest address will be promotable. See if we can find a better type than the
// integer datatype.
- Value *StrippedDest = MI->getOperand(1)->stripPointerCasts();
- if (StrippedDest != MI->getOperand(1)) {
+ Value *StrippedDest = MI->getOperand(0)->stripPointerCasts();
+ if (StrippedDest != MI->getOperand(0)) {
const Type *SrcETy = cast<PointerType>(StrippedDest->getType())
->getElementType();
if (TD && SrcETy->isSized() && TD->getTypeStoreSize(SrcETy) == Size) {
break;
}
- if (SrcETy->isSingleValueType())
- NewPtrTy = PointerType::getUnqual(SrcETy);
+ if (SrcETy->isSingleValueType()) {
+ NewSrcPtrTy = PointerType::get(SrcETy, SrcAddrSp);
+ NewDstPtrTy = PointerType::get(SrcETy, DstAddrSp);
+ }
}
}
SrcAlign = std::max(SrcAlign, CopyAlign);
DstAlign = std::max(DstAlign, CopyAlign);
- Value *Src = Builder->CreateBitCast(MI->getOperand(2), NewPtrTy);
- Value *Dest = Builder->CreateBitCast(MI->getOperand(1), NewPtrTy);
- Instruction *L = new LoadInst(Src, "tmp", false, SrcAlign);
+ Value *Src = Builder->CreateBitCast(MI->getOperand(1), NewSrcPtrTy);
+ Value *Dest = Builder->CreateBitCast(MI->getOperand(0), NewDstPtrTy);
+ Instruction *L = new LoadInst(Src, "tmp", MI->isVolatile(), SrcAlign);
InsertNewInstBefore(L, *MI);
- InsertNewInstBefore(new StoreInst(L, Dest, false, DstAlign), *MI);
+ InsertNewInstBefore(new StoreInst(L, Dest, MI->isVolatile(), DstAlign),
+ *MI);
// Set the size of the copy to 0, it will be deleted on the next iteration.
- MI->setOperand(3, Constant::getNullValue(MemOpLength->getType()));
+ MI->setOperand(2, Constant::getNullValue(MemOpLength->getType()));
return MI;
}
IntrinsicInst *II = dyn_cast<IntrinsicInst>(&CI);
if (!II) return visitCallSite(&CI);
-
+
// Intrinsics cannot occur in an invoke, so handle them here instead of in
// visitCallSite.
if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(II)) {
if (MemMoveInst *MMI = dyn_cast<MemMoveInst>(MI)) {
if (GlobalVariable *GVSrc = dyn_cast<GlobalVariable>(MMI->getSource()))
if (GVSrc->isConstant()) {
- Module *M = CI.getParent()->getParent()->getParent();
+ Module *M = MMI->getParent()->getParent()->getParent();
Intrinsic::ID MemCpyID = Intrinsic::memcpy;
- const Type *Tys[1];
- Tys[0] = CI.getOperand(3)->getType();
- CI.setOperand(0,
- Intrinsic::getDeclaration(M, MemCpyID, Tys, 1));
+ const Type *Tys[3] = { CI.getOperand(0)->getType(),
+ CI.getOperand(1)->getType(),
+ CI.getOperand(2)->getType() };
+ MMI->setCalledFunction(
+ Intrinsic::getDeclaration(M, MemCpyID, Tys, 3));
Changed = true;
}
}
// memmove(x,x,size) -> noop.
if (MTI->getSource() == MTI->getDest())
return EraseInstFromFunction(CI);
- }
- // If we can determine a pointer alignment that is bigger than currently
- // set, update the alignment.
- if (isa<MemTransferInst>(MI)) {
- if (Instruction *I = SimplifyMemTransfer(MI))
+ // If we can determine a pointer alignment that is bigger than currently
+ // set, update the alignment.
+ if (Instruction *I = SimplifyMemTransfer(MTI))
return I;
} else if (MemSetInst *MSI = dyn_cast<MemSetInst>(MI)) {
if (Instruction *I = SimplifyMemSet(MSI))
return I;
}
-
+
if (Changed) return II;
}
-
+
switch (II->getIntrinsicID()) {
default: break;
case Intrinsic::objectsize: {
- const Type *ReturnTy = CI.getType();
- Value *Op1 = II->getOperand(1);
- bool Min = (cast<ConstantInt>(II->getOperand(2))->getZExtValue() == 1);
-
// We need target data for just about everything so depend on it.
if (!TD) break;
+ const Type *ReturnTy = CI.getType();
+ bool Min = (cast<ConstantInt>(II->getOperand(1))->getZExtValue() == 1);
+
// Get to the real allocated thing and offset as fast as possible.
- Op1 = Op1->stripPointerCasts();
+ Value *Op1 = II->getOperand(0)->stripPointerCasts();
// If we've stripped down to a single global variable that we
// can know the size of then just return that.
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op1)) {
if (GV->hasDefinitiveInitializer()) {
Constant *C = GV->getInitializer();
- size_t globalSize = TD->getTypeAllocSize(C->getType());
- return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, globalSize));
+ uint64_t GlobalSize = TD->getTypeAllocSize(C->getType());
+ return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, GlobalSize));
} else {
+ // Can't determine size of the GV.
Constant *RetVal = ConstantInt::get(ReturnTy, Min ? 0 : -1ULL);
return ReplaceInstUsesWith(CI, RetVal);
}
- } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op1)) {
-
+ } else if (AllocaInst *AI = dyn_cast<AllocaInst>(Op1)) {
+ // Get alloca size.
+ if (AI->getAllocatedType()->isSized()) {
+ uint64_t AllocaSize = TD->getTypeAllocSize(AI->getAllocatedType());
+ if (AI->isArrayAllocation()) {
+ const ConstantInt *C = dyn_cast<ConstantInt>(AI->getArraySize());
+ if (!C) break;
+ AllocaSize *= C->getZExtValue();
+ }
+ return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, AllocaSize));
+ }
+ } else if (CallInst *MI = extractMallocCall(Op1)) {
+ const Type* MallocType = getMallocAllocatedType(MI);
+ // Get alloca size.
+ if (MallocType && MallocType->isSized()) {
+ if (Value *NElems = getMallocArraySize(MI, TD, true)) {
+ if (ConstantInt *NElements = dyn_cast<ConstantInt>(NElems))
+ return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy,
+ (NElements->getZExtValue() * TD->getTypeAllocSize(MallocType))));
+ }
+ }
+ } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op1)) {
// Only handle constant GEPs here.
if (CE->getOpcode() != Instruction::GetElementPtr) break;
GEPOperator *GEP = cast<GEPOperator>(CE);
Operand = Operand->stripPointerCasts();
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Operand))
if (!GV->hasDefinitiveInitializer()) break;
-
+
// Get what we're pointing to and its size.
const PointerType *BaseType =
cast<PointerType>(Operand->getType());
- size_t Size = TD->getTypeAllocSize(BaseType->getElementType());
+ uint64_t Size = TD->getTypeAllocSize(BaseType->getElementType());
// Get the current byte offset into the thing. Use the original
// operand in case we're looking through a bitcast.
SmallVector<Value*, 8> Ops(CE->op_begin()+1, CE->op_end());
const PointerType *OffsetType =
cast<PointerType>(GEP->getPointerOperand()->getType());
- size_t Offset = TD->getIndexedOffset(OffsetType, &Ops[0], Ops.size());
+ uint64_t Offset = TD->getIndexedOffset(OffsetType, &Ops[0], Ops.size());
- assert(Size >= Offset);
+ if (Size < Offset) {
+ // Out of bound reference? Negative index normalized to large
+ // index? Just return "I don't know".
+ Constant *RetVal = ConstantInt::get(ReturnTy, Min ? 0 : -1ULL);
+ return ReplaceInstUsesWith(CI, RetVal);
+ }
Constant *RetVal = ConstantInt::get(ReturnTy, Size-Offset);
return ReplaceInstUsesWith(CI, RetVal);
-
- }
+ }
+
+ // Do not return "I don't know" here. Later optimization passes could
+ // make it possible to evaluate objectsize to a constant.
+ break;
}
case Intrinsic::bswap:
// bswap(bswap(x)) -> x
- if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(II->getOperand(1)))
+ if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(II->getOperand(0)))
if (Operand->getIntrinsicID() == Intrinsic::bswap)
- return ReplaceInstUsesWith(CI, Operand->getOperand(1));
+ return ReplaceInstUsesWith(CI, Operand->getOperand(0));
// bswap(trunc(bswap(x))) -> trunc(lshr(x, c))
- if (TruncInst *TI = dyn_cast<TruncInst>(II->getOperand(1))) {
+ if (TruncInst *TI = dyn_cast<TruncInst>(II->getOperand(0))) {
if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(TI->getOperand(0)))
if (Operand->getIntrinsicID() == Intrinsic::bswap) {
unsigned C = Operand->getType()->getPrimitiveSizeInBits() -
TI->getType()->getPrimitiveSizeInBits();
Value *CV = ConstantInt::get(Operand->getType(), C);
- Value *V = Builder->CreateLShr(Operand->getOperand(1), CV);
+ Value *V = Builder->CreateLShr(Operand->getOperand(0), CV);
return new TruncInst(V, TI->getType());
}
}
break;
case Intrinsic::powi:
- if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getOperand(2))) {
+ if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getOperand(1))) {
// powi(x, 0) -> 1.0
if (Power->isZero())
return ReplaceInstUsesWith(CI, ConstantFP::get(CI.getType(), 1.0));
// powi(x, 1) -> x
if (Power->isOne())
- return ReplaceInstUsesWith(CI, II->getOperand(1));
+ return ReplaceInstUsesWith(CI, II->getOperand(0));
// powi(x, -1) -> 1/x
if (Power->isAllOnesValue())
return BinaryOperator::CreateFDiv(ConstantFP::get(CI.getType(), 1.0),
- II->getOperand(1));
+ II->getOperand(0));
}
break;
case Intrinsic::cttz: {
// If all bits below the first known one are known zero,
// this value is constant.
- const IntegerType *IT = cast<IntegerType>(II->getOperand(1)->getType());
+ const IntegerType *IT = cast<IntegerType>(II->getOperand(0)->getType());
uint32_t BitWidth = IT->getBitWidth();
APInt KnownZero(BitWidth, 0);
APInt KnownOne(BitWidth, 0);
- ComputeMaskedBits(II->getOperand(1), APInt::getAllOnesValue(BitWidth),
+ ComputeMaskedBits(II->getOperand(0), APInt::getAllOnesValue(BitWidth),
KnownZero, KnownOne);
unsigned TrailingZeros = KnownOne.countTrailingZeros();
APInt Mask(APInt::getLowBitsSet(BitWidth, TrailingZeros));
case Intrinsic::ctlz: {
// If all bits above the first known one are known zero,
// this value is constant.
- const IntegerType *IT = cast<IntegerType>(II->getOperand(1)->getType());
+ const IntegerType *IT = cast<IntegerType>(II->getOperand(0)->getType());
uint32_t BitWidth = IT->getBitWidth();
APInt KnownZero(BitWidth, 0);
APInt KnownOne(BitWidth, 0);
- ComputeMaskedBits(II->getOperand(1), APInt::getAllOnesValue(BitWidth),
+ ComputeMaskedBits(II->getOperand(0), APInt::getAllOnesValue(BitWidth),
KnownZero, KnownOne);
unsigned LeadingZeros = KnownOne.countLeadingZeros();
APInt Mask(APInt::getHighBitsSet(BitWidth, LeadingZeros));
}
break;
case Intrinsic::uadd_with_overflow: {
- Value *LHS = II->getOperand(1), *RHS = II->getOperand(2);
- const IntegerType *IT = cast<IntegerType>(II->getOperand(1)->getType());
+ Value *LHS = II->getOperand(0), *RHS = II->getOperand(1);
+ const IntegerType *IT = cast<IntegerType>(II->getOperand(0)->getType());
uint32_t BitWidth = IT->getBitWidth();
APInt Mask = APInt::getSignBit(BitWidth);
APInt LHSKnownZero(BitWidth, 0);
// FALL THROUGH uadd into sadd
case Intrinsic::sadd_with_overflow:
// Canonicalize constants into the RHS.
- if (isa<Constant>(II->getOperand(1)) &&
- !isa<Constant>(II->getOperand(2))) {
- Value *LHS = II->getOperand(1);
- II->setOperand(1, II->getOperand(2));
- II->setOperand(2, LHS);
+ if (isa<Constant>(II->getOperand(0)) &&
+ !isa<Constant>(II->getOperand(1))) {
+ Value *LHS = II->getOperand(0);
+ II->setOperand(0, II->getOperand(1));
+ II->setOperand(1, LHS);
return II;
}
// X + undef -> undef
- if (isa<UndefValue>(II->getOperand(2)))
+ if (isa<UndefValue>(II->getOperand(1)))
return ReplaceInstUsesWith(CI, UndefValue::get(II->getType()));
- if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getOperand(2))) {
+ if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getOperand(1))) {
// X + 0 -> {X, false}
if (RHS->isZero()) {
Constant *V[] = {
ConstantInt::getFalse(II->getContext())
};
Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
- return InsertValueInst::Create(Struct, II->getOperand(1), 0);
+ return InsertValueInst::Create(Struct, II->getOperand(0), 0);
}
}
break;
case Intrinsic::ssub_with_overflow:
// undef - X -> undef
// X - undef -> undef
- if (isa<UndefValue>(II->getOperand(1)) ||
- isa<UndefValue>(II->getOperand(2)))
+ if (isa<UndefValue>(II->getOperand(0)) ||
+ isa<UndefValue>(II->getOperand(1)))
return ReplaceInstUsesWith(CI, UndefValue::get(II->getType()));
- if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getOperand(2))) {
+ if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getOperand(1))) {
// X - 0 -> {X, false}
if (RHS->isZero()) {
Constant *V[] = {
- UndefValue::get(II->getOperand(1)->getType()),
+ UndefValue::get(II->getOperand(0)->getType()),
ConstantInt::getFalse(II->getContext())
};
Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
- return InsertValueInst::Create(Struct, II->getOperand(1), 0);
+ return InsertValueInst::Create(Struct, II->getOperand(0), 0);
}
}
break;
case Intrinsic::umul_with_overflow:
case Intrinsic::smul_with_overflow:
// Canonicalize constants into the RHS.
- if (isa<Constant>(II->getOperand(1)) &&
- !isa<Constant>(II->getOperand(2))) {
- Value *LHS = II->getOperand(1);
- II->setOperand(1, II->getOperand(2));
- II->setOperand(2, LHS);
+ if (isa<Constant>(II->getOperand(0)) &&
+ !isa<Constant>(II->getOperand(1))) {
+ Value *LHS = II->getOperand(0);
+ II->setOperand(0, II->getOperand(1));
+ II->setOperand(1, LHS);
return II;
}
// X * undef -> undef
- if (isa<UndefValue>(II->getOperand(2)))
+ if (isa<UndefValue>(II->getOperand(1)))
return ReplaceInstUsesWith(CI, UndefValue::get(II->getType()));
- if (ConstantInt *RHSI = dyn_cast<ConstantInt>(II->getOperand(2))) {
+ if (ConstantInt *RHSI = dyn_cast<ConstantInt>(II->getOperand(1))) {
// X*0 -> {0, false}
if (RHSI->isZero())
return ReplaceInstUsesWith(CI, Constant::getNullValue(II->getType()));
// X * 1 -> {X, false}
if (RHSI->equalsInt(1)) {
Constant *V[] = {
- UndefValue::get(II->getOperand(1)->getType()),
+ UndefValue::get(II->getOperand(0)->getType()),
ConstantInt::getFalse(II->getContext())
};
Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
- return InsertValueInst::Create(Struct, II->getOperand(1), 0);
+ return InsertValueInst::Create(Struct, II->getOperand(0), 0);
}
}
break;
case Intrinsic::x86_sse2_loadu_dq:
// Turn PPC lvx -> load if the pointer is known aligned.
// Turn X86 loadups -> load if the pointer is known aligned.
- if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) {
- Value *Ptr = Builder->CreateBitCast(II->getOperand(1),
+ if (GetOrEnforceKnownAlignment(II->getOperand(0), 16) >= 16) {
+ Value *Ptr = Builder->CreateBitCast(II->getOperand(0),
PointerType::getUnqual(II->getType()));
return new LoadInst(Ptr);
}
case Intrinsic::ppc_altivec_stvx:
case Intrinsic::ppc_altivec_stvxl:
// Turn stvx -> store if the pointer is known aligned.
- if (GetOrEnforceKnownAlignment(II->getOperand(2), 16) >= 16) {
+ if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) {
const Type *OpPtrTy =
- PointerType::getUnqual(II->getOperand(1)->getType());
- Value *Ptr = Builder->CreateBitCast(II->getOperand(2), OpPtrTy);
- return new StoreInst(II->getOperand(1), Ptr);
+ PointerType::getUnqual(II->getOperand(0)->getType());
+ Value *Ptr = Builder->CreateBitCast(II->getOperand(1), OpPtrTy);
+ return new StoreInst(II->getOperand(0), Ptr);
}
break;
case Intrinsic::x86_sse_storeu_ps:
case Intrinsic::x86_sse2_storeu_pd:
case Intrinsic::x86_sse2_storeu_dq:
// Turn X86 storeu -> store if the pointer is known aligned.
- if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) {
+ if (GetOrEnforceKnownAlignment(II->getOperand(0), 16) >= 16) {
const Type *OpPtrTy =
- PointerType::getUnqual(II->getOperand(2)->getType());
- Value *Ptr = Builder->CreateBitCast(II->getOperand(1), OpPtrTy);
- return new StoreInst(II->getOperand(2), Ptr);
+ PointerType::getUnqual(II->getOperand(1)->getType());
+ Value *Ptr = Builder->CreateBitCast(II->getOperand(0), OpPtrTy);
+ return new StoreInst(II->getOperand(1), Ptr);
}
break;
// These intrinsics only demands the 0th element of its input vector. If
// we can simplify the input based on that, do so now.
unsigned VWidth =
- cast<VectorType>(II->getOperand(1)->getType())->getNumElements();
+ cast<VectorType>(II->getOperand(0)->getType())->getNumElements();
APInt DemandedElts(VWidth, 1);
APInt UndefElts(VWidth, 0);
- if (Value *V = SimplifyDemandedVectorElts(II->getOperand(1), DemandedElts,
+ if (Value *V = SimplifyDemandedVectorElts(II->getOperand(0), DemandedElts,
UndefElts)) {
- II->setOperand(1, V);
+ II->setOperand(0, V);
return II;
}
break;
case Intrinsic::ppc_altivec_vperm:
// Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant.
- if (ConstantVector *Mask = dyn_cast<ConstantVector>(II->getOperand(3))) {
+ if (ConstantVector *Mask = dyn_cast<ConstantVector>(II->getOperand(2))) {
assert(Mask->getNumOperands() == 16 && "Bad type for intrinsic!");
// Check that all of the elements are integer constants or undefs.
if (AllEltsOk) {
// Cast the input vectors to byte vectors.
- Value *Op0 = Builder->CreateBitCast(II->getOperand(1), Mask->getType());
- Value *Op1 = Builder->CreateBitCast(II->getOperand(2), Mask->getType());
+ Value *Op0 = Builder->CreateBitCast(II->getOperand(0), Mask->getType());
+ Value *Op1 = Builder->CreateBitCast(II->getOperand(1), Mask->getType());
Value *Result = UndefValue::get(Op0->getType());
// Only extract each element once.
case Intrinsic::stackrestore: {
// If the save is right next to the restore, remove the restore. This can
// happen when variable allocas are DCE'd.
- if (IntrinsicInst *SS = dyn_cast<IntrinsicInst>(II->getOperand(1))) {
+ if (IntrinsicInst *SS = dyn_cast<IntrinsicInst>(II->getOperand(0))) {
if (SS->getIntrinsicID() == Intrinsic::stacksave) {
BasicBlock::iterator BI = SS;
if (&*++BI == II)
return true;
}
+namespace {
+class InstCombineFortifiedLibCalls : public SimplifyFortifiedLibCalls {
+ InstCombiner *IC;
+protected:
+ void replaceCall(Value *With) {
+ NewInstruction = IC->ReplaceInstUsesWith(*CI, With);
+ }
+ bool isFoldable(unsigned SizeCIOp, unsigned SizeArgOp, bool isString) const {
+ if (ConstantInt *SizeCI = dyn_cast<ConstantInt>(CI->getOperand(SizeCIOp))) {
+ if (SizeCI->isAllOnesValue())
+ return true;
+ if (isString)
+ return SizeCI->getZExtValue() >=
+ GetStringLength(CI->getOperand(SizeArgOp));
+ if (ConstantInt *Arg = dyn_cast<ConstantInt>(CI->getOperand(SizeArgOp)))
+ return SizeCI->getZExtValue() >= Arg->getZExtValue();
+ }
+ return false;
+ }
+public:
+ InstCombineFortifiedLibCalls(InstCombiner *IC) : IC(IC), NewInstruction(0) { }
+ Instruction *NewInstruction;
+};
+} // end anonymous namespace
+
+// Try to fold some different type of calls here.
+// Currently we're only working with the checking functions, memcpy_chk,
+// mempcpy_chk, memmove_chk, memset_chk, strcpy_chk, stpcpy_chk, strncpy_chk,
+// strcat_chk and strncat_chk.
+Instruction *InstCombiner::tryOptimizeCall(CallInst *CI, const TargetData *TD) {
+ if (CI->getCalledFunction() == 0) return 0;
+
+ InstCombineFortifiedLibCalls Simplifier(this);
+ Simplifier.fold(CI, TD);
+ return Simplifier.NewInstruction;
+}
+
// visitCallSite - Improvements for call and invoke instructions.
//
Instruction *InstCombiner::visitCallSite(CallSite CS) {
// We cannot remove an invoke, because it would change the CFG, just
// change the callee to a null pointer.
- cast<InvokeInst>(OldCall)->setOperand(0,
+ cast<InvokeInst>(OldCall)->setCalledFunction(
Constant::getNullValue(CalleeF->getType()));
return 0;
}
UndefValue::get(Type::getInt1PtrTy(Callee->getContext())),
CS.getInstruction());
- // If CS dues not return void then replaceAllUsesWith undef.
+ // If CS does not return void then replaceAllUsesWith undef.
// This allows ValueHandlers and custom metadata to adjust itself.
if (!CS.getInstruction()->getType()->isVoidTy())
CS.getInstruction()->
Changed = true;
}
+ // Try to optimize the call if possible, we require TargetData for most of
+ // this. None of these calls are seen as possibly dead so go ahead and
+ // delete the instruction now.
+ if (CallInst *CI = dyn_cast<CallInst>(CS.getInstruction())) {
+ Instruction *I = tryOptimizeCall(CI, TD);
+ // If we changed something return the result, etc. Otherwise let
+ // the fallthrough check.
+ if (I) return EraseInstFromFunction(*I);
+ }
+
return Changed ? CS.getInstruction() : 0;
}
IntrinsicInst *Tramp =
cast<IntrinsicInst>(cast<BitCastInst>(Callee)->getOperand(0));
- Function *NestF = cast<Function>(Tramp->getOperand(2)->stripPointerCasts());
+ Function *NestF = cast<Function>(Tramp->getOperand(1)->stripPointerCasts());
const PointerType *NestFPTy = cast<PointerType>(NestF->getType());
const FunctionType *NestFTy = cast<FunctionType>(NestFPTy->getElementType());
do {
if (Idx == NestIdx) {
// Add the chain argument and attributes.
- Value *NestVal = Tramp->getOperand(3);
+ Value *NestVal = Tramp->getOperand(2);
if (NestVal->getType() != NestTy)
NestVal = new BitCastInst(NestVal, NestTy, "nest", Caller);
NewArgs.push_back(NestVal);
projects / oota-llvm.git / blobdiff