[Bug target/77270] Flag -mprftchw is shared with 3dnow for -march=k8

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77270

--- Comment #4 from uros at gcc dot gnu.org ---
Author: uros
Date: Fri Aug 19 18:14:03 2016
New Revision: 239626

URL: https://gcc.gnu.org/viewcvs?rev=239626&root=gcc&view=rev
Log:
        PR target/77270
        * config/i386/i386.c (ix86_option_override_internal): Remove
        PTA_PRFCHW from entries that also have PTA_3DNOW flag.
        Enable SSE prefetch also for TARGET_PREFETCHWT1.
        Do not try to enable TARGET_PRFCHW ISA flag here.
        * config/i386/i386.md (prefetch): Enable also for TARGET_3DNOW.
        Rewrite expander function body.
        (*prefetch_3dnow): Enable for TARGET_3DNOW and TARGET_PREFETCHWT1.


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