if (Op0 == Op1)
return Constant::getNullValue(Op0->getType());
+ // (X % Y) % Y -> X % Y
+ if ((Opcode == Instruction::SRem &&
+ match(Op0, m_SRem(m_Value(), m_Specific(Op1)))) ||
+ (Opcode == Instruction::URem &&
+ match(Op0, m_URem(m_Value(), m_Specific(Op1)))))
+ return Op0;
+
// 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))
RecursionLimit);
}
+// Simplify (and (icmp ...) (icmp ...)) to true when we can tell that the range
+// of possible values cannot be satisfied.
+static Value *SimplifyAndOfICmps(ICmpInst *Op0, ICmpInst *Op1) {
+ ICmpInst::Predicate Pred0, Pred1;
+ ConstantInt *CI1, *CI2;
+ Value *V;
+ if (!match(Op0, m_ICmp(Pred0, m_Add(m_Value(V), m_ConstantInt(CI1)),
+ m_ConstantInt(CI2))))
+ return nullptr;
+
+ if (!match(Op1, m_ICmp(Pred1, m_Specific(V), m_Specific(CI1))))
+ return nullptr;
+
+ Type *ITy = Op0->getType();
+
+ auto *AddInst = cast<BinaryOperator>(Op0->getOperand(0));
+ bool isNSW = AddInst->hasNoSignedWrap();
+ bool isNUW = AddInst->hasNoUnsignedWrap();
+
+ const APInt &CI1V = CI1->getValue();
+ const APInt &CI2V = CI2->getValue();
+ const APInt Delta = CI2V - CI1V;
+ if (CI1V.isStrictlyPositive()) {
+ if (Delta == 2) {
+ if (Pred0 == ICmpInst::ICMP_ULT && Pred1 == ICmpInst::ICMP_SGT)
+ return getFalse(ITy);
+ if (Pred0 == ICmpInst::ICMP_SLT && Pred1 == ICmpInst::ICMP_SGT && isNSW)
+ return getFalse(ITy);
+ }
+ if (Delta == 1) {
+ if (Pred0 == ICmpInst::ICMP_ULE && Pred1 == ICmpInst::ICMP_SGT)
+ return getFalse(ITy);
+ if (Pred0 == ICmpInst::ICMP_SLE && Pred1 == ICmpInst::ICMP_SGT && isNSW)
+ return getFalse(ITy);
+ }
+ }
+ if (CI1V.getBoolValue() && isNUW) {
+ if (Delta == 2)
+ if (Pred0 == ICmpInst::ICMP_ULT && Pred1 == ICmpInst::ICMP_UGT)
+ return getFalse(ITy);
+ if (Delta == 1)
+ if (Pred0 == ICmpInst::ICMP_ULE && Pred1 == ICmpInst::ICMP_UGT)
+ return getFalse(ITy);
+ }
+
+ return nullptr;
+}
+
/// 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 Query &Q,
return Op1;
}
+ if (auto *ICILHS = dyn_cast<ICmpInst>(Op0)) {
+ if (auto *ICIRHS = dyn_cast<ICmpInst>(Op1)) {
+ if (Value *V = SimplifyAndOfICmps(ICILHS, ICIRHS))
+ return V;
+ if (Value *V = SimplifyAndOfICmps(ICIRHS, ICILHS))
+ return V;
+ }
+ }
+
// Try some generic simplifications for associative operations.
if (Value *V = SimplifyAssociativeBinOp(Instruction::And, Op0, Op1, Q,
MaxRecurse))
RecursionLimit);
}
+// Simplify (or (icmp ...) (icmp ...)) to true when we can tell that the union
+// contains all possible values.
+static Value *SimplifyOrOfICmps(ICmpInst *Op0, ICmpInst *Op1) {
+ ICmpInst::Predicate Pred0, Pred1;
+ ConstantInt *CI1, *CI2;
+ Value *V;
+ if (!match(Op0, m_ICmp(Pred0, m_Add(m_Value(V), m_ConstantInt(CI1)),
+ m_ConstantInt(CI2))))
+ return nullptr;
+
+ if (!match(Op1, m_ICmp(Pred1, m_Specific(V), m_Specific(CI1))))
+ return nullptr;
+
+ Type *ITy = Op0->getType();
+
+ auto *AddInst = cast<BinaryOperator>(Op0->getOperand(0));
+ bool isNSW = AddInst->hasNoSignedWrap();
+ bool isNUW = AddInst->hasNoUnsignedWrap();
+
+ const APInt &CI1V = CI1->getValue();
+ const APInt &CI2V = CI2->getValue();
+ const APInt Delta = CI2V - CI1V;
+ if (CI1V.isStrictlyPositive()) {
+ if (Delta == 2) {
+ if (Pred0 == ICmpInst::ICMP_UGE && Pred1 == ICmpInst::ICMP_SLE)
+ return getTrue(ITy);
+ if (Pred0 == ICmpInst::ICMP_SGE && Pred1 == ICmpInst::ICMP_SLE && isNSW)
+ return getTrue(ITy);
+ }
+ if (Delta == 1) {
+ if (Pred0 == ICmpInst::ICMP_UGT && Pred1 == ICmpInst::ICMP_SLE)
+ return getTrue(ITy);
+ if (Pred0 == ICmpInst::ICMP_SGT && Pred1 == ICmpInst::ICMP_SLE && isNSW)
+ return getTrue(ITy);
+ }
+ }
+ if (CI1V.getBoolValue() && isNUW) {
+ if (Delta == 2)
+ if (Pred0 == ICmpInst::ICMP_UGE && Pred1 == ICmpInst::ICMP_ULE)
+ return getTrue(ITy);
+ if (Delta == 1)
+ if (Pred0 == ICmpInst::ICMP_UGT && Pred1 == ICmpInst::ICMP_ULE)
+ return getTrue(ITy);
+ }
+
+ return nullptr;
+}
+
/// 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 Query &Q,
(A == Op0 || B == Op0))
return Constant::getAllOnesValue(Op0->getType());
+ if (auto *ICILHS = dyn_cast<ICmpInst>(Op0)) {
+ if (auto *ICIRHS = dyn_cast<ICmpInst>(Op1)) {
+ if (Value *V = SimplifyOrOfICmps(ICILHS, ICIRHS))
+ return V;
+ if (Value *V = SimplifyOrOfICmps(ICIRHS, ICILHS))
+ return V;
+ }
+ }
+
// Try some generic simplifications for associative operations.
if (Value *V = SimplifyAssociativeBinOp(Instruction::Or, Op0, Op1, Q,
MaxRecurse))