[Bug target/71805] incorrect code for test pr45752.c with -mcpu=power9

["meissner at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71805

--- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Tue Jul 12 17:42:04 2016
New Revision: 238256

URL: https://gcc.gnu.org/viewcvs?rev=238256&root=gcc&view=rev
Log:
[gcc]
2016-07-12  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/71805
        * config/rs6000/altivec.md (altivec_vperm_<mode>_internal):
        The xxperm and xxpermr instructions require that the 2nd input
        operand overlap with the output operand, and not the 1st.
        (altivec_vperm_v8hiv16qi): Likewise.
        (altivec_vperm_<mode>_uns_internal): Likewise.
        (altivec_vpermr_<mode>_internal): Likewise.
        (vperm_v8hiv4si): Likewise.
        (vperm_v16qiv8hi): Likewise.

[gcc/testsuite]
2016-07-12  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/71805
        * gcc.target/powerpc/pr71805.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/powerpc/pr71805.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/altivec.md
    trunk/gcc/testsuite/ChangeLog