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[InstCombine] Don't explicitly invoke const folding in shift combine

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InstCombine uses an IRBuilder that automatically performs
target-dependent constant folding, so explicitly invoking it here
is not necessary.
This commit is contained in:
Nikita Popov 2020-03-04 18:33:00 +01:00
parent 88c43a1ace
commit d09c237c96
1 changed files with 2 additions and 7 deletions
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9
lib/Transforms/InstCombine/InstCombineShifts.cpp
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@ -612,14 +612,9 @@ static Value *getShiftedValue(Value *V, unsigned NumBits, bool isLeftShift,
// We can always evaluate constants shifted.
if (Constant *C = dyn_cast<Constant>(V)) {
if (isLeftShift)
V = IC.Builder.CreateShl(C, NumBits);
return IC.Builder.CreateShl(C, NumBits);
else
V = IC.Builder.CreateLShr(C, NumBits);
// If we got a constantexpr back, try to simplify it with TD info.
// TODO: This is dubious, IRBuilder<TargetFolder> should already do this.
if (auto *C = dyn_cast<Constant>(V))
V = ConstantFoldConstant(C, DL, &IC.getTargetLibraryInfo());
return V;
return IC.Builder.CreateLShr(C, NumBits);
}
Instruction *I = cast<Instruction>(V);