[Bug tree-optimization/52252] An opportunity for x86 gcc vectorizer (gain up to 3 times)

[kyukhin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52252

--- Comment #7 from Kirill Yukhin <kyukhin at gcc dot gnu.org> ---
Author: kyukhin
Date: Wed Jun 18 07:46:18 2014
New Revision: 211769

URL: https://gcc.gnu.org/viewcvs?rev=211769&root=gcc&view=rev
Log:
gcc/
    * config/i386/i386.c (ix86_reassociation_width): Add alternative for
    vector case.
    * config/i386/i386.h (TARGET_VECTOR_PARALLEL_EXECUTION): New.
    * config/i386/x86-tune.def (X86_TUNE_VECTOR_PARALLEL_EXECUTION): New.
    * tree-vect-data-refs.c (vect_shift_permute_load_chain): New.
    Introduces alternative way of loads group permutaions.
    (vect_transform_grouped_load): Try alternative way of permutations.

gcc/testsuite/
    PR tree-optimization/52252
    * gcc.target/i386/pr52252-atom.c: Test on loads group of size 3.
    * gcc.target/i386/pr52252-core.c: Ditto.

    PR tree-optimization/61403
    * gcc.target/i386/pr61403.c: Test on loads and stores group of size 3.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr52252-atom.c
    trunk/gcc/testsuite/gcc.target/i386/pr52252-core.c
    trunk/gcc/testsuite/gcc.target/i386/pr61403.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.h
    trunk/gcc/config/i386/x86-tune.def
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-data-refs.c