[llvm] [RFC][WIP][X86] Attempt to move the AVX512 VSELECT(COND, 0, X) -> VSELECT(!COND, X, 0) fold to DAGToDAG (PR #145724)
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Thu Jun 26 00:52:58 PDT 2025
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@@ -5,7 +5,8 @@ define void @PR117684(i1 %cond, <8 x float> %vec, ptr %ptr1, ptr %ptr2) #0 {
; CHECK-LABEL: PR117684:
; CHECK: # %bb.0:
; CHECK-NEXT: vxorps %xmm1, %xmm1, %xmm1
-; CHECK-NEXT: vcmpnltss %xmm1, %xmm0, %k1
+; CHECK-NEXT: vcmpltss %xmm1, %xmm0, %k0
+; CHECK-NEXT: knotb %k0, %k1
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RKSimon wrote:
Do we have a helper to inverse FCMP codes? We have one for swapping/commutation but I can't find anything for NOT(FCMP(X,Y,I)) -> FCMP(X,Y,NOT(I)).
https://github.com/llvm/llvm-project/pull/145724
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