Monad 34c89eff64 [InstCombine] Fold trunc nuw/nsw (x xor y) to i1 to x != y (#90408) ...

Fold:
``` llvm
define i1 @src(i8 %x, i8 %y) {
  %xor = xor i8 %x, %y
  %r = trunc nuw/nsw i8 %xor to i1
  ret i1 %r
}

define i1 @tgt(i8 %x, i8 %y) {
  %r = icmp ne i8 %x, %y
  ret i1 %r
}
```

Proof: https://alive2.llvm.org/ce/z/dcuHmn

2024-04-30 18:07:40 +08:00

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