http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53590
--- Comment #9 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-06-15 09:22:04 UTC --- Author: ebotcazou Date: Fri Jun 15 09:22:00 2012 New Revision: 188651 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188651 Log: PR middle-end/53590 * common.opt (-fdelete-dead-exceptions): New switch. * doc/invoke.texi (Code Gen Options): Document it. * cse.c (count_reg_usage) <CALL_INSN>: Use !insn_nothrow_p in lieu of insn_could_throw_p predicate. Do not skip an insn that could throw if dead exceptions can be deleted. (insn_live_p): Likewise, do not return true in that case. * dce.c (can_alter_cfg): New flag. (deletable_insn_p): Do not return false for an insn that can throw if the CFG can be altered and dead exceptions can be deleted. (init_dce): Set can_alter_cfg to false for fast DCE, true otherwise. * dse.c (scan_insn): Use !insn_nothrow_p in lieu of insn_could_throw_ predicate. Do not preserve an insn that could throw if dead exceptions can be deleted. * function.h (struct function): Add can_delete_dead_exceptions flag. * function.c (allocate_struct_function): Set it. * lto-streamer-in.c (input_struct_function_base): Stream it. * lto-streamer-out.c (input_struct_function_base): Likewise. * tree-ssa-dce.c (mark_stmt_if_obviously_necessary): Do not mark a statement that could throw as necessary if dead exceptions can be deleted. ada/ * gcc-interface/misc.c (gnat_init_options_struct): Set opts->x_flag_delete_dead_exceptions to 1. Modified: trunk/gcc/ChangeLog trunk/gcc/ada/ChangeLog trunk/gcc/ada/gcc-interface/misc.c trunk/gcc/common.opt trunk/gcc/cse.c trunk/gcc/dce.c trunk/gcc/doc/invoke.texi trunk/gcc/dse.c trunk/gcc/function.c trunk/gcc/function.h trunk/gcc/lto-streamer-in.c trunk/gcc/lto-streamer-out.c trunk/gcc/tree-ssa-dce.c
