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[InstCombine] Remove unnecessary intrinsics demanded elts handling 

As discussed on D28777 - we don't need to handle 'all element' shuffles inside InstCombiner::visitCallInst as InstCombiner::SimplifyDemandedVectorElts will do everything we need.

llvm-svn: 292365
This commit is contained in:
Simon Pilgrim 2017-01-18 13:44:04 +00:00
parent a92d6230da
commit a22c3a1c0f
1 changed files with 2 additions and 22 deletions
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24
llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -2327,40 +2327,20 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
case Intrinsic::x86_ssse3_pshuf_b_128:
case Intrinsic::x86_avx2_pshuf_b:
case Intrinsic::x86_avx512_pshuf_b_512: {
case Intrinsic::x86_avx512_pshuf_b_512:
if (Value *V = simplifyX86pshufb(*II, *Builder))
return replaceInstUsesWith(*II, V);
unsigned VWidth = II->getType()->getVectorNumElements();
APInt UndefElts(VWidth, 0);
APInt DemandedElts = APInt::getAllOnesValue(VWidth);
if (Value *V = SimplifyDemandedVectorElts(II, DemandedElts, UndefElts)) {
if (V != II)
return replaceInstUsesWith(*II, V);
return II;
}
break;
}
case Intrinsic::x86_avx_vpermilvar_ps:
case Intrinsic::x86_avx_vpermilvar_ps_256:
case Intrinsic::x86_avx512_vpermilvar_ps_512:
case Intrinsic::x86_avx_vpermilvar_pd:
case Intrinsic::x86_avx_vpermilvar_pd_256:
case Intrinsic::x86_avx512_vpermilvar_pd_512: {
case Intrinsic::x86_avx512_vpermilvar_pd_512:
if (Value *V = simplifyX86vpermilvar(*II, *Builder))
return replaceInstUsesWith(*II, V);
unsigned VWidth = II->getType()->getVectorNumElements();
APInt UndefElts(VWidth, 0);
APInt DemandedElts = APInt::getAllOnesValue(VWidth);
if (Value *V = SimplifyDemandedVectorElts(II, DemandedElts, UndefElts)) {
if (V != II)
return replaceInstUsesWith(*II, V);
return II;
}
break;
}
case Intrinsic::x86_avx2_permd:
case Intrinsic::x86_avx2_permps: