https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98513
--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:71878c08e967997b570b1acbd9ffef4234e94698 commit r10-9263-g71878c08e967997b570b1acbd9ffef4234e94698 Author: Richard Biener <rguent...@suse.de> Date: Wed Jan 6 09:26:55 2021 +0100 tree-optimization/98513 - fix bug in range intersection code This fixes a premature optimization in the range intersection code which assumes earlier branches have to be taken, not taking into account that for symbolic ranges we cannot always compare endpoints. The fix is to instantiate the compare deemed redundant (which then fails as undecidable for the testcase). 2021-01-06 Richard Biener <rguent...@suse.de> PR tree-optimization/98513 * value-range.cc (intersect_ranges): Compare the upper bounds for the expected relation. * gcc.dg/tree-ssa/pr98513.c: New testcase. (cherry picked from commit a05cc70a6c1ae0e5b22e16f4d8d13995a38ea1f9)
