[Bug target/92651] [10 Regression] Unnecessary stv transform in some x86 backend

[liuhongt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92651

--- Comment #9 from liuhongt at gcc dot gnu.org ---
Author: liuhongt
Date: Tue Dec 17 01:50:35 2019
New Revision: 279452

URL: https://gcc.gnu.org/viewcvs?rev=279452&root=gcc&view=rev
Log:
Add abs pattern to handle {si,di} mode abs to avoid pmax/cmove conversion.

2019-12-17  Hongyu Wang  <hongyu.w...@intel.com>

gcc/
        PR target/92651
        * config/i386/i386.h (TARGET_EXPAND_ABS): New macro.
        * config/i386/x86-tune.def (X86_TUNE_EXPAND_ABS): New.
        * config/i386/i386.md (abs<SWI48x>2): New define_expand.

gcc/testsuite
        * gcc.target/i386/pr92651.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr92651.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.h
    trunk/gcc/config/i386/i386.md
    trunk/gcc/config/i386/x86-tune.def
    trunk/gcc/testsuite/ChangeLog