Yingwei Zheng 62cd07fb67 [InstCombine] Canonicalize sub mask, X -> ~X when high bits are ignored (#110635) ...

Alive2: https://alive2.llvm.org/ce/z/NJgBPL

The motivating case of this patch is to emit `andn` on RISC-V with zbb
for expressions like `(sub 63, X) & 63`.

2024-10-02 12:48:06 +08:00

4.1 KiB

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