https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109154
--- Comment #38 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:c9954996cd647daf0ba03e34dd279b97982f671f commit r13-6923-gc9954996cd647daf0ba03e34dd279b97982f671f Author: Richard Biener <rguent...@suse.de> Date: Tue Mar 28 15:20:22 2023 +0200 tree-optimization/109154 - improve if-conversion for vectorization With multi-argument PHIs and now doing VN on the if-converted blocks the optimization of CSEing condition and negated condition doesn't work well anymore. The following restores this a little bit for the case of a single inverted condition into a COND_EXPR where we can instead swap the COND_EXPR arms. The same optimization is already done for the case of two-argument PHIs. This avoids one comparison/mask for the testcase at hand. PR tree-optimization/109154 * tree-if-conv.cc (gen_phi_arg_condition): Handle single inverted condition specially by inverting at the caller. (gen_phi_arg_condition): Swap COND_EXPR arms if requested.
