http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44374
--- Comment #6 from Bernd Schmidt <bernds at gcc dot gnu.org> 2010-12-14 00:23:48 UTC --- Author: bernds Date: Tue Dec 14 00:23:40 2010 New Revision: 167779 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=167779 Log: gcc/ PR rtl-optimization/44374 Reapply patch with fixes. * basic-block.h (enum bb_flags): Add BB_MODIFIED. * df-core.c (df_set_bb_dirty): Set it. * ifcvt.c (find_memory): Remove function. (dead_or_predicable): Use can_move_insns_across. * df.h (can_move_insns_across): Declare function. * cfgcleanup.c (block_was_dirty): New static variable. (flow_find_head_matching_sequence): Test for epilogue notes. (try_crossjump_bb, try_forward_edges): Test BB_MODIFIED flag rather than df_get_bb_dirty. (try_head_merge_bb): New static function. (try_optimize_cfg): Call it. Call df_analyze if block_was_dirty is set. * df-problems.c: Include "target.h" (df_simulate_find_uses): New static function. (MEMREF_NORMAL, MEMREF_VOLATILE): New macros. (find_memory, find_memory_store): New static functions. (can_move_insns_across): New function. * Makefile.in (df-problems.o): Update dependencies. gcc/testsuite/ PR rtl-optimization/44374 Reapply patch with fixes. * gcc.target/arm/headmerge-1.c: New test. * gcc.target/arm/headmerge-2.c: New test. * gcc.target/i386/headmerge-1.c: New test. * gcc.target/i386/headmerge-2.c: New test. Added: trunk/gcc/testsuite/gcc.target/arm/headmerge-1.c trunk/gcc/testsuite/gcc.target/arm/headmerge-2.c trunk/gcc/testsuite/gcc.target/i386/headmerge-1.c trunk/gcc/testsuite/gcc.target/i386/headmerge-2.c Modified: trunk/gcc/ChangeLog trunk/gcc/Makefile.in trunk/gcc/basic-block.h trunk/gcc/cfgcleanup.c trunk/gcc/df-core.c trunk/gcc/df-problems.c trunk/gcc/df.h trunk/gcc/ifcvt.c trunk/gcc/testsuite/ChangeLog
