https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97873
--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Jakub Jelinek from comment #4) > So then either we should expand the SWI48x mode abs for !TARGET_EXPAND_ABS > into > a pre-reload define_insn_and_split with abs that we'd split almost like > smax, except for using the result of neg for the condition codes (and we'd > need to see how it plays with STV), or add a define_insn_and_split that > would match what the combiner is trying: > (set (reg:SI 84) > (smax:SI (neg:SI (reg/v:SI 83 [ x ])) > (reg/v:SI 83 [ x ]))) > (clobber (reg:CC 17 flags)) > and again split that cmov consumer of neg as flag setter (and again see what > STV does with that). This should be done after combine pass, so STV has a chance to convert min/max to SSE instructions. Effectively that means that only a peephole2 is feasible.
