[llvm] [GlobalIsel] Combine G_SELECT (PR #74845)

[Amara Emerson via llvm-commits]

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@@ -253,9 +253,7 @@ body:             |
     ; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(s64) = COPY $x1
     ; CHECK-NEXT: %c:_(s1) = G_TRUNC [[COPY]](s64)
     ; CHECK-NEXT: %t:_(s1) = G_TRUNC [[COPY1]](s64)
-    ; CHECK-NEXT: %one:_(s1) = G_CONSTANT i1 true
-    ; CHECK-NEXT: [[XOR:%[0-9]+]]:_(s1) = G_XOR %c, %one
-    ; CHECK-NEXT: %sel:_(s1) = G_OR [[XOR]], %t
+    ; CHECK-NEXT: %sel:_(s1) = G_OR %c, %t
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aemerson wrote:

This doesn't look right? if cond = true, tval = 0 then (select cond, tval, 1) evals to 0

now G_OR (cond, tval) would evaluate to 1

https://github.com/llvm/llvm-project/pull/74845