[Bug tree-optimization/79389] [7 Regression] 30% performance regression in SciMark2 MonteCarlo

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79389

--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Feb 23 22:05:19 2017
New Revision: 245690

URL: https://gcc.gnu.org/viewcvs?rev=245690&root=gcc&view=rev
Log:
        PR tree-optimization/79389
        * ifcvt.c (struct noce_if_info): Add rev_cond field.
        (noce_reversed_cond_code): New function.
        (noce_emit_store_flag): Use rev_cond if non-NULL instead of
        reversed_comparison_code.  Formatting fix.
        (noce_try_store_flag): Test rev_cond != NULL in addition to
        reversed_comparison_code.
        (noce_try_store_flag_constants): Likewise.
        (noce_try_store_flag_mask): Likewise.
        (noce_try_addcc): Use rev_cond if non-NULL instead of
        reversed_comparison_code.
        (noce_try_cmove_arith): Likewise.  Formatting fixes.
        (noce_try_minmax, noce_try_abs): Clear rev_cond.
        (noce_find_if_block): Initialize rev_cond.
        (find_cond_trap): Call noce_get_condition with then_bb == trap_bb
        instead of false as last argument never attempt to reverse it
        afterwards.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ifcvt.c