https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767
--- Comment #19 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:f99d7d669eaa2830eb5878df4da67e77ec791522 commit r13-5106-gf99d7d669eaa2830eb5878df4da67e77ec791522 Author: Richard Biener <rguent...@suse.de> Date: Mon Jan 9 09:42:22 2023 +0100 tree-optimization/107767 - not profitable switch conversion When the CFG has not merged equal PHI defs in a switch stmt the cost model from switch conversion gets off and we prefer a jump table over branches. The following fixes that by recording cases that will be merged later and more appropriately counting unique values. PR tree-optimization/107767 * tree-cfgcleanup.cc (phi_alternatives_equal): Export. * tree-cfgcleanup.h (phi_alternatives_equal): Declare. * tree-switch-conversion.cc (switch_conversion::collect): Count unique non-default targets accounting for later merging opportunities. * gcc.dg/tree-ssa/pr107767.c: New testcase.
