[llvm] [DAGCombiner] Freeze maybe poison operands when folding select to logic (PR #84924)

[Chen Zheng via llvm-commits]

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@@ -23,11 +23,12 @@ define i32 @a() {
 ; CHECK-NEXT:    li 5, 0
 ; CHECK-NEXT:    mr 30, 3
 ; CHECK-NEXT:    addic 6, 4, 6
-; CHECK-NEXT:    addze 5, 5
 ; CHECK-NEXT:    rlwinm 6, 6, 0, 28, 26
-; CHECK-NEXT:    andi. 5, 5, 1
+; CHECK-NEXT:    addze 5, 5
 ; CHECK-NEXT:    cmplw 1, 6, 4
-; CHECK-NEXT:    crorc 20, 1, 4
+; CHECK-NEXT:    andi. 5, 5, 1
+; CHECK-NEXT:    crnot 20, 4
+; CHECK-NEXT:    cror 20, 1, 20
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chenzheng1030 wrote:

This becomes worse. A combine for i1 type seems broken. Let me check why this happens.

https://github.com/llvm/llvm-project/pull/84924