http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50763
--- Comment #7 from vries at gcc dot gnu.org 2011-10-23 16:06:38 UTC --- Author: vries Date: Sun Oct 23 16:06:32 2011 New Revision: 180341 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180341 Log: 2011-10-23 Tom de Vries <t...@codesourcery.com> PR tree-optimization/50763 * tree-ssa-tail-merge.c (same_succ_flush_bb): New function, factored out of ... (same_succ_flush_bbs): Use same_succ_flush_bb. (purge_bbs): Remove argument. Remove calls to same_succ_flush_bbs, release_last_vdef and delete_basic_block. (unlink_virtual_phi): New function. (update_vuses): Add and use vuse1_phi_args argument. Set var to SSA_NAME_VAR of vuse1 or vuse2, and use var. Handle case that def_stmt2 is NULL. Use phi result as phi arg in case vuse1 or vuse2 is NULL_TREE. Replace uses of vuse1 if vuse2 is NULL_TREE. Fix code to limit replacement of uses. Propagate phi argument for phis with a single argument. (replace_block_by): Update vops if phi_vuse1 or phi_vuse2 is NULL_TREE. Set vuse1_phi_args if vuse1 is a phi defined in bb1. Add vuse1_phi_args as argument to call to update_vuses. Call release_last_vdef, same_succ_flush_bb, delete_basic_block. Update CDI_DOMINATORS info. (tail_merge_optimize): Remove argument in call to purge_bbs. Remove call to free_dominance_info. Only call calculate_dominance_info once. Modified: trunk/gcc/ChangeLog trunk/gcc/tree-ssa-tail-merge.c
