[X86] combineSetCC - attempt to match more complex icmp_eq/ne patterns before falling back to PTEST/PMOVMSKB patterns (#180034)
combineVectorSizedSetCCEquality attempts to convert equality comparisons
of larger-than-legal scalar integers to PTEST/PMOVMSKB vector
comparisons.
However, combineSetCC has a number of other folds with more complex
icmp_eq/ne patterns that work with big integers (including bit test and
reduction patterns) that don't get a change to match as
combineVectorSizedSetCCEquality is run first, and the other folds are
then more difficult to match from PTEST/PMOVMSKB nodes.
This patch moves the combineVectorSizedSetCCEquality fold later to give
other icmp_eq/ne folds a chance to run first.
llvm-project
cc4b98e5 - [X86] combineSetCC - attempt to match more complex icmp_eq/ne patterns before falling back to PTEST/PMOVMSKB patterns (#180034)
