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Simplify a vpermil* with constant mask.

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With a constant mask a vpermil* is just a shufflevector. This patch implements
that simplification. This allows us to produce denser code. It should also
allow more folding down the line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206801 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-04-21 22:06:04 +00:00
parent 2b77be29da
commit db0a73f31b
2 changed files with 45 additions and 0 deletions
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15
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@@ -577,6 +577,21 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
break;
}
case Intrinsic::x86_avx_vpermilvar_ps:
case Intrinsic::x86_avx_vpermilvar_ps_256:
case Intrinsic::x86_avx_vpermilvar_pd:
case Intrinsic::x86_avx_vpermilvar_pd_256: {
// Convert vpermil* to shufflevector if the mask is constant.
Value *V = II->getArgOperand(1);
if (auto C = dyn_cast<ConstantDataVector>(V)) {
auto V1 = II->getArgOperand(0);
auto V2 = UndefValue::get(V1->getType());
auto Shuffle = Builder->CreateShuffleVector(V1, V2, C);
return ReplaceInstUsesWith(CI, Shuffle);
}
break;
}
case Intrinsic::ppc_altivec_vperm:
// Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant.
if (Constant *Mask = dyn_cast<Constant>(II->getArgOperand(2))) {