https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56719
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:d96b8556e569a1ccce36ef990e167031d07a661a commit r11-6374-gd96b8556e569a1ccce36ef990e167031d07a661a Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Dec 31 10:19:06 2020 +0100 reassoc: Optimize x > 0x1fff || y > 0x1fff into (x | y) > 0x1fff [PR56719] The following patch adds an optimization mentioned in PR56719 #c8. We already have the x != 0 && y != 0 && z != 0 into (x | y | z) != 0 and x != -1 && y != -1 && y != -1 into (x & y & z) != -1 optimizations, this patch just extends that to x < C && y < C && z < C for power of two constants C into (x | y | z) < C (for unsigned comparisons). I didn't want to create too many buckets (there can be TYPE_PRECISION such constants), so the patch instead just uses one buckets for all such constants and loops over that bucket up to TYPE_PRECISION times. 2020-12-31 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/56719 * tree-ssa-reassoc.c (optimize_range_tests_cmp_bitwise): Also optimize x < C && y < C && z < C when C is a power of two constant into (x | y | z) < C. * gcc.dg/tree-ssa/pr56719.c: New test.
