[Bug tree-optimization/79390] [7 Regression] 10% performance drop in SciMark2 LU after r242550

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79390

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr  4 17:52:27 2017
New Revision: 246686

URL: https://gcc.gnu.org/viewcvs?rev=246686&root=gcc&view=rev
Log:
        PR tree-optimization/79390
        * target.h (struct noce_if_info): Declare.
        * targhooks.h (default_noce_conversion_profitable_p): Declare.
        * target.def (noce_conversion_profitable_p): New target hook.
        * ifcvt.h (struct noce_if_info): New type, moved from ...
        * ifcvt.c (struct noce_if_info): ... here.
        (noce_conversion_profitable_p): Renamed to ...
        (default_noce_conversion_profitable_p): ... this.  No longer
        static nor inline.
        (noce_try_store_flag_constants, noce_try_addcc,
        noce_try_store_flag_mask, noce_try_cmove, noce_try_cmove_arith,
        noce_convert_multiple_sets): Use targetm.noce_conversion_profitable_p
        instead of noce_conversion_profitable_p.
        * config/i386/i386.c: Include ifcvt.h.
        (ix86_option_override_internal): Don't override
        PARAM_MAX_RTL_IF_CONVERSION_INSNS default.
        (ix86_noce_conversion_profitable_p): New function.
        (TARGET_NOCE_CONVERSION_PROFITABLE_P): Redefine.
        * config/i386/x86-tune.def (X86_TUNE_ONE_IF_CONV_INSN): Adjust comment.
        * doc/tm.texi.in (TARGET_NOCE_CONVERSION_PROFITABLE_P): Add.
        * doc/tm.texi: Regenerated.

        * gcc.target/i386/pr79390.c: New test.
        * gcc.dg/ifcvt-4.c: Use -mtune-ctrl=^one_if_conv_insn for i?86/x86_64.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr79390.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/x86-tune.def
    trunk/gcc/doc/tm.texi
    trunk/gcc/doc/tm.texi.in
    trunk/gcc/ifcvt.c
    trunk/gcc/ifcvt.h
    trunk/gcc/target.def
    trunk/gcc/target.h
    trunk/gcc/targhooks.h
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/ifcvt-4.c