llvm-project

107601ed - [InstCombine] Allow min/max in constant BOp min/max folding (#142878)

[InstCombine] Allow min/max in constant BOp min/max folding (#142878) Extend folding for `X Pred C2 ? X BOp C1 : C2 BOp C1` to `min/max(X, C2) BOp C1` to allow min and max as `BOp`. This ensures a constant clamping pattern is folded into a pair of min/max instructions. Here is a simplified example of a case where this folding is not occurring currently. int clampToU8(int v) { if (v < 0) return 0; if (v > 255) return 255; return v; } https://godbolt.org/z/78jhKPWbv Generic proof: https://alive2.llvm.org/ce/z/cdpLYy