Commits on May 23, 2024

1. [DAG][X86] expandABD - add branchless abds/abdu expansion for 0/-1 co… …

   …mparison result cases
   
   If the comparison results are allbits masks, we can expand as "abd(lhs, rhs) -> sub(cmpgt(lhs, rhs), xor(sub(lhs, rhs), cmpgt(lhs, rhs)))", replacing a sub+sub+select pattern with the simpler sub+xor+sub pattern.
   
   This allows us to remove a lot of X86 specific legalization code, and will be useful in future generic expansion for the legalization work in llvm#92576
   
   Alive2: https://alive2.llvm.org/ce/z/sj863C

   

   RKSimon committed May 23, 2024
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