[Bug target/68655] SSE2 cannot vec_perm of low and high part

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68655

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Dec  4 08:25:24 2015
New Revision: 231247

URL: https://gcc.gnu.org/viewcvs?rev=231247&root=gcc&view=rev
Log:
        PR target/68655
        * config/i386/i386.c (canonicalize_vector_int_perm): New function.
        (expand_vec_perm_1): Use it and recurse if everything else
        failed.  Use nd.perm instead of perm2.
        (expand_vec_perm_even_odd_1): If testing_p, use gen_raw_REG
        instead of gen_lowpart for the target.
        (ix86_expand_vec_perm_const_1): Use canonicalize_vector_int_perm
        and recurse if everything else failed.

        * gcc.dg/torture/vshuf-4.inc (TESTS): Add one extra test.
        * gcc.dg/torture/vshuf-4.inc (TESTS): Add two extra tests.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/torture/vshuf-4.inc
    trunk/gcc/testsuite/gcc.dg/torture/vshuf-8.inc