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[InstCombine] improve readability; NFC

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CreateIntCast returns the input if its type matches, so need to duplicate that check.
This commit is contained in:
Sanjay Patel 2019-12-06 10:59:25 -05:00
parent 7d9af1f0f7
commit d9ffcf2505
1 changed files with 6 additions and 10 deletions
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16
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -863,19 +863,15 @@ Instruction *InstCombiner::transformZExtICmp(ICmpInst *Cmp, ZExtInst &Zext,
(Pred == ICmpInst::ICMP_SGT && Op1C->isAllOnesValue())) {
if (!DoTransform) return Cmp;
Value *In = Op0;
Value *ShAmt = ConstantInt::get(CmpOpType,
CmpOpType->getScalarSizeInBits() - 1);
In = Builder.CreateLShr(In, ShAmt, In->getName() + ".lobit");
if (CmpOpType != ZType)
In = Builder.CreateIntCast(In, ZType, false /*ZExt*/);
Value *Sh = Builder.CreateLShr(Op0, ShAmt, Op0->getName() + ".lobit");
Value *Cast = Builder.CreateIntCast(Sh, ZType, false /*ZExt*/);
// Invert low bit if testing for positive.
if (Pred == ICmpInst::ICMP_SGT)
Cast = Builder.CreateXor(Cast, ConstantInt::get(CmpOpType, 1));
if (Pred == ICmpInst::ICMP_SGT) {
Constant *One = ConstantInt::get(CmpOpType, 1);
In = Builder.CreateXor(In, One, In->getName() + ".not");
}
return replaceInstUsesWith(Zext, In);
return replaceInstUsesWith(Zext, Cast);
}
// zext (X == 0) to i32 --> X^1 iff X has only the low bit set.