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[InstCombine] simplify code for shuffle mask canonicalization; NFC 

We never use the local 'Mask' before returning, so that was dead code.
This commit is contained in:
Sanjay Patel 2019-11-25 11:11:12 -05:00
parent 847aabf11f
commit fc31b58eff
1 changed files with 4 additions and 6 deletions
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10
llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
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@ -1900,13 +1900,11 @@ Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
continue; continue;
} }
if (Mask[i] < (int)LHSWidth && isa<UndefValue>(LHS)) { // Change select of undef to undef mask element or force to LHS.
Mask[i] = -1; // Turn into undef. if (Mask[i] < (int)LHSWidth && isa<UndefValue>(LHS))
Elts.push_back(UndefValue::get(Int32Ty)); Elts.push_back(UndefValue::get(Int32Ty));
} else { else
Mask[i] = Mask[i] % LHSWidth; // Force to LHS. Elts.push_back(ConstantInt::get(Int32Ty, Mask[i] % LHSWidth));
Elts.push_back(ConstantInt::get(Int32Ty, Mask[i]));
}
} }
SVI.setOperand(0, SVI.getOperand(1)); SVI.setOperand(0, SVI.getOperand(1));
SVI.setOperand(1, UndefValue::get(RHS->getType())); SVI.setOperand(1, UndefValue::get(RHS->getType()));