Alex MacLean 59388fb0b9 [InstCombine] Preserve NSW/NUW flags when folding const BOp with min/max (#143471) ...

When folding `X Pred C2 ? X BOp C1 : C2 BOp C1` to `min/max(X, C2) BOp
C1`, if NUW/NSW flags are present on `X BOp C1` and could be safely
applied to `C2 BOp C1`, then they may be added on the BOp after the fold
is complete. https://alive2.llvm.org/ce/z/n_3aNJ

Preserving these flags can allow subsequent transforms to re-order the
min/max and BOp, which in the case of NVPTX would allow for some
potential future transformations which would improve
instruction-selection.

2025-06-13 11:16:44 -07:00

174 KiB

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