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Reduce indenting and clean up comparisons around sign bit.

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llvm-svn: 306781
This commit is contained in:
Eric Christopher 2017-06-30 01:57:48 +00:00
parent 5dcdc7a3d3
commit a95aac3751
1 changed files with 7 additions and 6 deletions
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13
llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
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@ -1448,12 +1448,13 @@ Instruction *InstCombiner::foldICmpWithConstant(ICmpInst &Cmp) {
// of a test and branch. So we avoid canonicalizing in such situations
// because test and branch instruction has better branch displacement
// than compare and branch instruction.
if (!(IsSignBit && hasBranchUse(Cmp)) && !Cmp.isEquality()) {
if (auto *AI = Intersection.getSingleElement())
return new ICmpInst(ICmpInst::ICMP_EQ, X, Builder->getInt(*AI));
if (auto *AD = Difference.getSingleElement())
return new ICmpInst(ICmpInst::ICMP_NE, X, Builder->getInt(*AD));
}
if (Cmp.isEquality() || (IsSignBit && hasBranchUse(Cmp)))
return nullptr;
if (auto *AI = Intersection.getSingleElement())
return new ICmpInst(ICmpInst::ICMP_EQ, X, Builder->getInt(*AI));
if (auto *AD = Difference.getSingleElement())
return new ICmpInst(ICmpInst::ICMP_NE, X, Builder->getInt(*AD));
}
return nullptr;