https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84427
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Author: rguenth Date: Fri Mar 2 07:45:41 2018 New Revision: 258124 URL: https://gcc.gnu.org/viewcvs?rev=258124&root=gcc&view=rev Log: 2018-03-02 Richard Biener <rguent...@suse.de> PR tree-optimization/84427 * tree-ssa-pre.c (bitmap_remove_expr_from_set): Remove. (bitmap_set_subtract_values): Rewrite to handle multiple exprs per value. (clean): Likewise. (prune_clobbered_mems): Likewise. (phi_translate): Take edge instead of pred/phiblock. (phi_translate_1): Likewise. (phi_translate_set): Likewise. Insert all translated exprs for a value into the set, keeping possibly multiple expressions per value. (compute_antic_aux): Adjust for phi_translate changes. When intersecting union the expressions and prune those not in the final value set, keeping possibly multiple expressions per value. Do not use value-insertion for unioning ANTIC_OUT U EXP_GEN - TMP_GEN but merge all expressions. Add verification that the value-sets only shrink during iteration. (compute_partial_antic_aux): Adjust for the phi_translate changes. (do_pre_regular_insertion): Likewise. (do_pre_partial_partial_insertion): Likewise. * gcc.dg/torture/pr84427.c: New testcase. Added: trunk/gcc/testsuite/gcc.dg/torture/pr84427.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-pre.c
