phiopt: Remove unnecessary checks from spaceship_replacement [PR106506]

Those 2 checks were just me trying to be extra careful, the
(phires & 1) == phires and variants it is folded to of course make only sense
for the -1/0/1/2 result spaceship, for -1/0/1 one can just use comparisons of
phires.  We only floating point spaceship if nans aren't honored, so the
2 case is ignored, and if it is, with Aldy's changes we can simplify the
2 case away from the phi but the (phires & 1) == phires stayed.  It is safe
to treat the phires comparison as phires >= 0 even then.

2022-08-12  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/106506
	* tree-ssa-phiopt.cc (spaceship_replacement): Don't punt for
	is_cast or orig_use_lhs cases if phi_bb has 3 predecessors.

	* g++.dg/opt/pr94589-2.C: New test.

0 files changed, 0 insertions, 0 deletions