[Bug target/62128] Use vpalignr for AVX2 rotation

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62128

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Oct  2 07:29:49 2014
New Revision: 215796

URL: https://gcc.gnu.org/viewcvs?rev=215796&root=gcc&view=rev
Log:
    PR target/62128
    * config/i386/i386.c (expand_vec_perm_1): Try expand_vec_perm_palignr
    if it expands to a single insn only.
    (expand_vec_perm_palignr): Add SINGLE_INSN_ONLY_P argument.  If true,
    fail unless in_order is true.  Add forward declaration.
    (expand_vec_perm_vperm2f128): Fix up comment about which permutation
    is useful for one_operand_p.
    (ix86_expand_vec_perm_const_1): Adjust expand_vec_perm_palignr caller.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c