https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94921
--- Comment #4 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:a7b76d574b19190da190a60c065f347f40bab59e commit r11-132-ga7b76d574b19190da190a60c065f347f40bab59e Author: Jakub Jelinek <ja...@redhat.com> Date: Wed May 6 11:20:20 2020 +0200 match.pd: Optimize ~(~X +- Y) into (X -+ Y) [PR94921] According to my verification proglet, this transformation for signed types with undefined overflow doesn't introduce nor remove any UB cases, so should be valid even for signed integral types. Not using a for because of the :c on plus which can't be there on minus. 2020-05-06 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/94921 * match.pd (~(~X - Y) -> X + Y, ~(~X + Y) -> X - Y): New simplifications. * gcc.dg/tree-ssa/pr94921.c: New test.
