https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95929
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:ddd64a6ec3b38e18aefb9fcba50c0d9297e5e711 commit r14-3432-gddd64a6ec3b38e18aefb9fcba50c0d9297e5e711 Author: Andrew Pinski <apin...@marvell.com> Date: Tue Aug 22 18:41:56 2023 -0700 MATCH: remove negate for 1bit types For 1bit types, negate is either undefined or don't change the value. In either cases we want to remove them. This patch adds a match pattern to do that. Also converting to a 1bit type we can remove the negate just like we already do for `&1` so this patch adds that too. OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. Notes on the testcases: This patch is the last part to fix PR 95929; cond-bool-2.c testcase. bit1neg-1.c is a 1bit-field testcase where we could remove the assignment all the way in one case (which happened on the RTL level for some targets but not all). cond-bool-2.c is the reduced testcase of PR 95929. PR tree-optimization/95929 gcc/ChangeLog: * match.pd (convert?(-a)): New pattern for 1bit integer types. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/bit1neg-1.c: New test. * gcc.dg/tree-ssa/cond-bool-1.c: New test. * gcc.dg/tree-ssa/cond-bool-2.c: New test.
