maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
View File

@ -1900,13 +1900,11 @@ Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
continue;
}
if (Mask[i] < (int)LHSWidth && isa<UndefValue>(LHS)) {
Mask[i] = -1; // Turn into undef.
// Change select of undef to undef mask element or force to LHS.
if (Mask[i] < (int)LHSWidth && isa<UndefValue>(LHS))
Elts.push_back(UndefValue::get(Int32Ty));
} else {
Mask[i] = Mask[i] % LHSWidth; // Force to LHS.
Elts.push_back(ConstantInt::get(Int32Ty, Mask[i]));
}
else
Elts.push_back(ConstantInt::get(Int32Ty, Mask[i] % LHSWidth));
}
SVI.setOperand(0, SVI.getOperand(1));
SVI.setOperand(1, UndefValue::get(RHS->getType()));