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

[kyukhin at gcc dot gnu.org]

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

--- Comment #5 from Kirill Yukhin <kyukhin at gcc dot gnu.org> ---
Author: kyukhin
Date: Wed May  7 12:10:22 2014
New Revision: 210155

URL: http://gcc.gnu.org/viewcvs?rev=210155&root=gcc&view=rev
Log:
gcc/
    * tree-vect-data-refs.c (vect_grouped_load_supported): New
    check for loads group of length 3.
    (vect_permute_load_chain): New permutations for loads group of
    length 3.
    * tree-vect-stmts.c (vect_model_load_cost): Change cost
    of vec_perm_shuffle for the new permutations.

gcc/testsuite/
    PR tree-optimization/52252
    * gcc.dg/vect/pr52252-ld.c: Test on loads group of size 3.


Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr52252-ld.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-data-refs.c
    trunk/gcc/tree-vect-stmts.c