phiopt: Optimize partial_ordering spaceship >= 0 -ffinite-math-only [PR94589]
As mentioned earlier, spaceship_replacement didn't optimize partial_ordering
>= 0 comparisons, because the possible values are -1, 0, 1, 2 and the
>= comparison is implemented as (res & 1) == res to choose the 0 and 1
cases from that. As we optimize that only with -ffinite-math-only, the
2 case is assumed not to happen and my earlier match.pd change optimizes
(res & 1) == res into (res & ~1) == 0, so this patch pattern matches
that case and handles it like res >= 0.
2021-05-18 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/94589
* tree-ssa-phiopt.c (spaceship_replacement): Pattern match
phi result used in (res & ~1) == 0 comparison as res >= 0 as
res == 2 would be UB with -ffinite-math-only.
* g++.dg/opt/pr94589-2.C: Adjust scan-tree-dump count from 14 to 12.