https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79173
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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Attachment #55271|0 |1
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 55274
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55274&action=edit
gcc14-pr79173.patch
Full patch I'm going to test.
Unfortunately, I haven't been successful at getting the subc stuff working when
not using __builtin_sub_overflow builtins nor _subborrow_u* instrinsics, only
addc seems to work in that case, seems reassoc rewrites stuff that we no longer
are able to even pattern match __builtin_sub_overflow in that case.
So, maybe even adding the ugly clang builtins as a canned way how to express it
canonically would be useful, the pattern matching can't handle infinite number
of different ways how to write the same thing.
