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[InstCombine] Move the checks for pointer types in getMaskedTypeForICmpPair earlier in the function

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I don't think there's any reason to have them scattered about and on all 4 operands. We already have an early check that both compares must be the same type. And within a given compare the LHS and RHS must have the same type. Beyond that I don't think there's anyway this function returns anything valid for pointer types. So let's just return early and be done with it.

Differential Revision: https://reviews.llvm.org/D36561

llvm-svn: 311383
This commit is contained in:
Craig Topper 2017-08-21 21:00:45 +00:00
parent 41fb068d8d
commit f241c0c2b9
1 changed files with 6 additions and 12 deletions
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18
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@ -314,8 +314,8 @@ static unsigned getMaskedTypeForICmpPair(Value *&A, Value *&B, Value *&C,
ICmpInst::Predicate &PredR) {
if (LHS->getOperand(0)->getType() != RHS->getOperand(0)->getType())
return 0;
// vectors are not (yet?) supported
if (LHS->getOperand(0)->getType()->isVectorTy())
// vectors are not (yet?) supported. Don't support pointers either.
if (!LHS->getOperand(0)->getType()->isIntegerTy())
return 0;
// Here comes the tricky part:
@ -332,20 +332,14 @@ static unsigned getMaskedTypeForICmpPair(Value *&A, Value *&B, Value *&C,
L21 = L22 = L1 = nullptr;
} else {
// Look for ANDs in the LHS icmp.
if (!L1->getType()->isIntegerTy()) {
// You can icmp pointers, for example. They really aren't masks.
L11 = L12 = nullptr;
} else if (!match(L1, m_And(m_Value(L11), m_Value(L12)))) {
if (!match(L1, m_And(m_Value(L11), m_Value(L12)))) {
// Any icmp can be viewed as being trivially masked; if it allows us to
// remove one, it's worth it.
L11 = L1;
L12 = Constant::getAllOnesValue(L1->getType());
}
if (!L2->getType()->isIntegerTy()) {
// You can icmp pointers, for example. They really aren't masks.
L21 = L22 = nullptr;
} else if (!match(L2, m_And(m_Value(L21), m_Value(L22)))) {
if (!match(L2, m_And(m_Value(L21), m_Value(L22)))) {
L21 = L2;
L22 = Constant::getAllOnesValue(L2->getType());
}
@ -372,7 +366,7 @@ static unsigned getMaskedTypeForICmpPair(Value *&A, Value *&B, Value *&C,
E = R2;
R1 = nullptr;
Ok = true;
} else if (R1->getType()->isIntegerTy()) {
} else {
if (!match(R1, m_And(m_Value(R11), m_Value(R12)))) {
// As before, model no mask as a trivial mask if it'll let us do an
// optimization.
@ -398,7 +392,7 @@ static unsigned getMaskedTypeForICmpPair(Value *&A, Value *&B, Value *&C,
return 0;
// Look for ANDs on the right side of the RHS icmp.
if (!Ok && R2->getType()->isIntegerTy()) {
if (!Ok) {
if (!match(R2, m_And(m_Value(R11), m_Value(R12)))) {
R11 = R2;
R12 = Constant::getAllOnesValue(R2->getType());