[Bug middle-end/53590] compiler fails to generate SIMD instruction for FP division

["ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

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