https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81292
--- Comment #8 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- Author: rsandifo Date: Tue Jul 4 11:48:44 2017 New Revision: 249961 URL: https://gcc.gnu.org/viewcvs?rev=249961&root=gcc&view=rev Log: PR 81292: ICE on related strlens after r249880 r249880 installed the result of a strlen in a strinfo if the strinfo wasn't previously a full string. But as Jakub says in the PR comments, we can't just do that in isolation, because there are no vdefs on the call that would invalidate any related strinfos. This patch updates the related strinfos if the adjustment is simple and invalidates them otherwise. As elsewhere, we treat adjustments of the form strlen +/- INTEGER_CST as simple but anything else as too complex. 2017-07-04 Richard Sandiford <richard.sandif...@linaro.org> gcc/ PR tree-optimization/81292 * tree-ssa-strlen.c (handle_builtin_strlen): When setting full_string_p, also call adjust_related_strinfos if the adjustment is simple, otherwise invalidate related strinfos. gcc/testsuite/ PR tree-optimization/81292 * gcc.dg/pr81292-1.c: New test. * gcc.dg/pr81292-2.c: Likewise. Added: trunk/gcc/testsuite/gcc.dg/pr81292-1.c trunk/gcc/testsuite/gcc.dg/pr81292-2.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-strlen.c
