https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78496
--- Comment #9 from Jeffrey A. Law <law at gcc dot gnu.org> --- Author: law Date: Sat May 6 15:03:40 2017 New Revision: 247721 URL: https://gcc.gnu.org/viewcvs?rev=247721&root=gcc&view=rev Log: PR tree-optimization/78496 * tree-vrp.c (simplify_assert_expr_using_ranges): New function. (simplify_stmt_using_ranges): Call it. (vrp_dom_walker::before_dom_children): Extract equivalences from an ASSERT_EXPR with an equality comparison against a constant. PR tree-optimization/78496 * gcc.dg/tree-ssa/ssa-thread-16.c: New test. * gcc.dg/tree-ssa/ssa-thread-17.c: New test. Added: trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-thread-16.c trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-thread-17.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-vrp.c