Yingwei Zheng e577f14b67 [InstCombine] Use m_NotForbidPoison when folding (X u< Y) ? -1 : (~X + Y) --> uadd.sat(~X, Y) (#114345) ...

Alive2: https://alive2.llvm.org/ce/z/mTGCo-
We cannot reuse `~X` if `m_AllOnes` matches a vector constant with some
poison elts. An alternative solution is to create a new not instead of
reusing `~X`. But it doesn't worth the effort because we need to add a
one-use check.

Fixes https://github.com/llvm/llvm-project/issues/113869.

2024-11-01 22:18:44 +08:00

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