[PATCH] D59363: [SelectionDAG] Add icmp UNDEF handling to SelectionDAG::FoldSetCC

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon marked an inline comment as done.
RKSimon added inline comments.


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Comment at: test/CodeGen/X86/urem-seteq-vec-nonsplat.ll:686
 ; CHECK-SSE:       # %bb.0:
-; CHECK-SSE-NEXT:    pxor %xmm0, %xmm0
-; CHECK-SSE-NEXT:    pcmpeqd %xmm0, %xmm0
-; CHECK-SSE-NEXT:    psrld $31, %xmm0
+; CHECK-SSE-NEXT:    movaps {{.*#+}} xmm0 = [1,1,1,1]
 ; CHECK-SSE-NEXT:    retq
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lebedev.ri wrote:
> Hmm, but `-instsimplify` says it's `0` https://godbolt.org/z/1dpyQG
> Either answer is correct?
Interesting (please can you raise a bug?) - the patch isn't actually changing the result in DAG, its just managing to constant fold.


Repository:
  rL LLVM

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  https://reviews.llvm.org/D59363/new/

https://reviews.llvm.org/D59363