llvm-project

902acde3 - [InstCombine] Optimize away certain additions using modular arithmetic

[InstCombine] Optimize away certain additions using modular arithmetic We can turn: ``` %add = add i8 %arg, C1 %and = and i8 %add, C2 %cmp = icmp eq i1 %and, C3 ``` into: ``` %and = and i8 %arg, C2 %cmp = icmp eq i1 %and, (C3 - C1) & C2 ``` This is only worth doing if the sequence is the sole user of the addition operation.