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Instcombile optimization: extractelement(cast) -> cast(extractelement)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128683 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2011-03-31 22:57:29 +00:00
parent ca6fd009ad
commit 0ff8a4fa35
2 changed files with 36 additions and 1 deletions
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10
lib/Transforms/InstCombine/InstCombineVectorOps.cpp
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@ -230,8 +230,16 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
ConstantInt::get(Int32Ty,
SrcIdx, false));
}
} else if (CastInst *CI = dyn_cast<CastInst>(I)) {
// Canonicalize extractelement(cast) -> cast(extractelement)
// bitcasts can change the number of vector elements and they cost nothing
if (CI->hasOneUse() && EI.hasOneUse() &&
(CI->getOpcode() != Instruction::BitCast)) {
Value *EE = Builder->CreateExtractElement(CI->getOperand(0),
EI.getIndexOperand());
return CastInst::Create(CI->getOpcode(), EE, EI.getType());
}
}
// FIXME: Canonicalize extractelement(bitcast) -> bitcast(extractelement)
}
return 0;
}