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c3669bb677
This moves the pattern `(X & ~Y) | (~X & Y)` to use bitwise_inverted_equal_p so we can simplify earlier the case where X and Y are defined by comparisons. We were able to optimize to (!X)^(!Y) in the end due to the pattern added in r14-3110-g7fb65f102851248bafa0815 and the older pattern r13-4620-g4d9db4bdd458 . But folding it earlier is better. OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. Note pr87009.c now gets `return x ^ s; in one case where the test had been expecting `return s ^ x;` both are valid and would be expectly the same; just we now chose a slightly different order of simplification which causes the order of the operands to be different. gcc/ChangeLog: * match.pd (`(X & ~Y) | (~X & Y)`): Use bitwise_inverted_equal_p instead of specifically checking for ~X. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/cmpbit-3.c: New test. * gcc.dg/pr87009.c: Update test. |
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