Re: [4.7 PATCH, i386]: Enable prefetchw for selected AMD targets
On Wed, Sep 12, 2012 at 11:20 AM, Uros Bizjak ubiz...@gmail.com wrote:
Hello!
Newer AMD processors does not enable 3dNOW anymore. However, prefetchw
depends on TARGET_3DNOW, so it is not generated anymore. Following
patch is a 4.7 version of mainline patch [1].
2012-09-12 Uros Bizjak ubiz...@gmail.com
* config/i386/i386.h (x86_prefetchw): New global variable.
(TARGET_PREFETCHW): New macro.
* config/i386/i386.c (PTA_PREFETCHW): Ditto.
(processor_alias_table): Add PTA_PREFETCHW to
bdver1, bdver2 and btver1.
(ix86_option_override_internal): Set x86_prefetchw for
PTA_PREFETCHW targets.
* config/i386/i386.md (prefetch): Expand to prefetchw
for TARGET_PREFETCHW.
(*prefetch_3dnow_mode): Also enable for TARGET_PREFETCHW.
Patch was bootstrapped and regression tested on x86_64-pc-linux-gnu
{,-m32}. Will be committed to 4.7 branch after [1] is committed to
mainline.
[1] http://gcc.gnu.org/ml/gcc-patches/2012-09/msg00670.html
Do we need to update driver-i386.c?
--
H.J.
Re: [4.7 PATCH, i386]: Enable prefetchw for selected AMD targets
On Wed, Sep 12, 2012 at 8:30 PM, H.J. Lu hjl.to...@gmail.com wrote:
Newer AMD processors does not enable 3dNOW anymore. However, prefetchw
depends on TARGET_3DNOW, so it is not generated anymore. Following
patch is a 4.7 version of mainline patch [1].
2012-09-12 Uros Bizjak ubiz...@gmail.com
* config/i386/i386.h (x86_prefetchw): New global variable.
(TARGET_PREFETCHW): New macro.
* config/i386/i386.c (PTA_PREFETCHW): Ditto.
(processor_alias_table): Add PTA_PREFETCHW to
bdver1, bdver2 and btver1.
(ix86_option_override_internal): Set x86_prefetchw for
PTA_PREFETCHW targets.
* config/i386/i386.md (prefetch): Expand to prefetchw
for TARGET_PREFETCHW.
(*prefetch_3dnow_mode): Also enable for TARGET_PREFETCHW.
Patch was bootstrapped and regression tested on x86_64-pc-linux-gnu
{,-m32}. Will be committed to 4.7 branch after [1] is committed to
mainline.
[1] http://gcc.gnu.org/ml/gcc-patches/2012-09/msg00670.html
Do we need to update driver-i386.c?
No, the patch is not a backport of -mprfchw, but statically enables
prefetchw for targets that have prefetchw, but don't define
TARGET_3DNOW anymore.
Uros.
