Yingwei Zheng 5e2dcfe42c [InstCombine] Avoid infinite loop in foldSelectValueEquivalence (#142754) ...

Before this patch, InstCombine hung because it replaced a value with a
more complex one:
```
%sel = select i1 %cmp, i32 %smax, i32 0 ->
%sel = select i1 %cmp, i32 %masked, i32 0 ->
%sel = select i1 %cmp, i32 %smax, i32 0 ->
...
```
This patch makes this replacement more conservative. It only performs
the replacement iff the new value is one of the operands of the original
value.

Closes https://github.com/llvm/llvm-project/issues/142405.

2025-06-04 19:42:56 +08:00

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