[llvm] [InstCombine][X86] Fold blendv(x, y, shuffle(bitcast(sext(m)))) -> select(shuffle(m),x,y) (PR #96882)
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Wed Jul 3 00:19:40 PDT 2024
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@@ -2800,6 +2800,23 @@ X86TTIImpl::instCombineIntrinsic(InstCombiner &IC, IntrinsicInst &II) const {
return SelectInst::Create(NewSelector, Op1, Op0, "blendv");
}
+ // Peek through a one-use shuffle - VectorCombine should have simplified
+ // this for cases where we're splitting wider vectors to use blendv
+ // intrinsics.
+ Value *MaskSrc = nullptr;
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goldsteinn wrote:
Should we `peekThroughBitcast` on `Mask` here?
https://github.com/llvm/llvm-project/pull/96882
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