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Re: [PATCH, i386] Add prefixes avoidance tuning for silvermont target

From: Ilya Enkovich <enkovich dot gnu at gmail dot com>
To: Uros Bizjak <ubizjak at gmail dot com>
Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, Jakub Jelinek <jakub at redhat dot com>, Vladimir Makarov <vmakarov at redhat dot com>
Date: Tue, 2 Dec 2014 14:08:33 +0300
Subject: Re: [PATCH, i386] Add prefixes avoidance tuning for silvermont target
Authentication-results: sourceware.org; auth=none
References: <CAMbmDYYKv+CYsaYH+_gABQomB3o5rfZ+dbO=iiUbKmxjqmKiDg at mail dot gmail dot com> <CAFULd4aL+MYcYH4+bgkCi7=0U9c6GOyzyP8=25X_PcZa4dHWWw at mail dot gmail dot com> <CAMbmDYb167cYiOx5qVuOy=2hxBV6oU_TJWkKzusqTuugyBpHUw at mail dot gmail dot com> <CAFULd4ZtADqy=_jgX5iaAmqpnc+kd3ZaK_8M0kRnGzywHxQ8nA at mail dot gmail dot com> <CAMbmDYaYSBaXNJzeihPzpccfPPR6_g584MfAugYiohwdWwGhxA at mail dot gmail dot com> <CAFULd4aJk1DNZ7tLMKXBPjYYGPsuqGpciK0rqmd3=9cb5ezhqQ at mail dot gmail dot com> <20140715110155 dot GA48158 at msticlxl57 dot ims dot intel dot com> <CAFULd4YhTr6RSVyrg6N98_vR3cPi9D8i0shnsCLRbiiYH-CyUA at mail dot gmail dot com> <CAMbmDYaf1gxGZZ2skruSLCkynXLxC-8SfrJ+gkWU8R7WD6Ni_A at mail dot gmail dot com> <CAFULd4b++WRFHO=UsT8mnaYE9NO9bvfjcjNoZPvFRdzjMJLmNA at mail dot gmail dot com>

On 05 Nov 11:00, Uros Bizjak wrote:
> On Wed, Nov 5, 2014 at 10:35 AM, Ilya Enkovich <enkovich.gnu@gmail.com> wrote:
> > Hi,
> >
> > Having stage1 close to end, may we make some decision regarding this
> > patch? Having a couple of working variants, may we choose and use one
> > of them?
> 
> I propose to wait for Vlad for an update about his plans on register
> preference algorythm that would fix this (and other "Ya*r"-type
> issues).
> 
> In the absence of the fix, we'll go with "Yr,*x".
> 
> Uros.
> 

Hi,

Here is an updated patch which uses "Yr,*x" option to avoid long prefixes for Silvermont.  Bootstrapped and tested on x86_64-unknown-linux-gnu.  OK for trunk?

Thanks,
Ilya
--
gcc/

2014-12-02  Ilya Enkovich  <ilya.enkovich@intel.com>

	* config/i386/constraints.md (Yr): New.
	* config/i386/i386.h (reg_class): Add NO_REX_SSE_REGS.
	(REG_CLASS_NAMES): Likewise.
	(REG_CLASS_CONTENTS): Likewise.
	* config/i386/sse.md (*vec_concatv2sf_sse4_1): Add alternatives
	which use only NO_REX_SSE_REGS.
	(vec_set<mode>_0): Likewise.
	(*vec_setv4sf_sse4_1): Likewise.
	(sse4_1_insertps): Likewise.
	(*sse4_1_extractps): Likewise.
	(*sse4_1_mulv2siv2di3<mask_name>): Likewise.
	(*<sse4_1_avx2>_mul<mode>3<mask_name>): Likewise.
	(*sse4_1_<code><mode>3<mask_name>): Likewise.
	(*sse4_1_<code><mode>3): Likewise.
	(*sse4_1_eqv2di3): Likewise.
	(sse4_2_gtv2di3): Likewise.
	(*vec_extractv4si): Likewise.
	(*vec_concatv2si_sse4_1): Likewise.
	(vec_concatv2di): Likewise.
	(<sse4_1>_blend<ssemodesuffix><avxsizesuffix>): Likewise.
	(<sse4_1>_blendv<ssemodesuffix><avxsizesuffix>): Likewise.
	(<sse4_1>_dp<ssemodesuffix><avxsizesuffix>): Likewise.
	(<vi8_sse4_1_avx2_avx512>_movntdqa): Likewise.
	(<sse4_1_avx2>_mpsadbw): Likewise.
	(<sse4_1_avx2>packusdw<mask_name>): Likewise.
	(<sse4_1_avx2>_pblendvb): Likewise.
	(sse4_1_pblendw): Likewise.
	(sse4_1_phminposuw): Likewise.
	(sse4_1_<code>v8qiv8hi2<mask_name>): Likewise.
	(sse4_1_<code>v4qiv4si2<mask_name>): Likewise.
	(sse4_1_<code>v4hiv4si2<mask_name>): Likewise.
	(sse4_1_<code>v2qiv2di2<mask_name>): Likewise.
	(sse4_1_<code>v2hiv2di2<mask_name>): Likewise.
	(sse4_1_<code>v2siv2di2<mask_name>): Likewise.
	(sse4_1_ptest): Likewise.
	(<sse4_1>_round<ssemodesuffix><avxsizesuffix>): Likewise.
	(sse4_1_round<ssescalarmodesuffix>): Likewise.
	* config/i386/subst.md (mask_prefix4): New.
	* config/i386/x86-tune.def (X86_TUNE_AVOID_4BYTE_PREFIXES): New.

gcc/testsuites/

2014-12-02  Ilya Enkovich  <ilya.enkovich@intel.com>

	* gcc.target/i386/sse2-init-v2di-2.c: Adjust to changed
	vec_concatv2di template.

Attachment: slm-prefixes1.patch
Description: Text document

Follow-Ups:
- Re: [PATCH, i386] Add prefixes avoidance tuning for silvermont target
  - From: Uros Bizjak

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