Hi,
I re-attached the patch here. Can someone review it?
We would like to commit to trunk as well as 4.6 branch.
Thanks,
Changpeng
________________________________________
From: Fang, Changpeng
Sent: Monday, June 27, 2011 5:42 PM
To: Fang, Changpeng; Jan Hubicka
Cc: Uros Bizjak; gcc-patches@gcc.gnu.org; rguent...@suse.de
Subject: RE: [PATCH, i386] Enable -mprefer-avx128 by default for Bulldozer
Is this patch OK to commit to trunk?
Also I would like to backport this patch to gcc 4.6 branch. Do I have to send a
separate
request or use this one?
Thanks,
Changpeng
________________________________________
From: Fang, Changpeng
Sent: Friday, June 24, 2011 7:12 PM
To: Jan Hubicka
Cc: Uros Bizjak; gcc-patches@gcc.gnu.org; rguent...@suse.de
Subject: RE: [PATCH, i386] Enable -mprefer-avx128 by default for Bulldozer
Hi,
I have no preference in tune feature coding. But I agree with you it's better
to
put similar things together. I modified the code following your suggestion.
Is it OK to commit this modified patch?
Thanks,
Changpeng
________________________________________
From: Jan Hubicka [hubi...@ucw.cz]
Sent: Thursday, June 23, 2011 6:20 PM
To: Fang, Changpeng
Cc: Uros Bizjak; gcc-patches@gcc.gnu.org; hubi...@ucw.cz; rguent...@suse.de
Subject: Re: [PATCH, i386] Enable -mprefer-avx128 by default for Bulldozer
Hi,
> --- a/gcc/config/i386/i386.c
> +++ b/gcc/config/i386/i386.c
> @@ -2128,6 +2128,9 @@ static const unsigned int
> x86_avx256_split_unaligned_load
> static const unsigned int x86_avx256_split_unaligned_store
> = m_COREI7 | m_BDVER1 | m_GENERIC;
>
> +static const unsigned int x86_prefer_avx128
> + = m_BDVER1;
What is reason for stuff like this to not go into initial_ix86_tune_features?
I sort of liked them better when they was individual flags, but having the
target
tunning flags spread across multiple places seems unnecesary.
Honza
From a325395439a314f87b3c79a5b9ce79a6a976a710 Mon Sep 17 00:00:00 2001
From: Changpeng Fang <chfang@huainan.(none)>
Date: Wed, 22 Jun 2011 15:03:05 -0700
Subject: [PATCH] Auto-vectorizer generates 128-bit AVX insns by default for bdver1
* config/i386/i386.opt (mprefer-avx128): Redefine the flag as a Mask option.
* config/i386/i386.h (ix86_tune_indices): Add X86_TUNE_AVX128_OPTIMAL entry.
(TARGET_AVX128_OPTIMAL): New definition.
* config/i386/i386.c (initial_ix86_tune_features): Initialize
X86_TUNE_AVX128_OPTIMAL entry.
(ix86_option_override_internal): Enable the generation
of the 128-bit instructions when TARGET_AVX128_OPTIMAL is set.
(ix86_preferred_simd_mode): Use TARGET_PREFER_AVX128.
(ix86_autovectorize_vector_sizes): Use TARGET_PREFER_AVX128.
---
gcc/config/i386/i386.c | 16 ++++++++++++----
gcc/config/i386/i386.h | 4 +++-
gcc/config/i386/i386.opt | 2 +-
3 files changed, 16 insertions(+), 6 deletions(-)
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 014401b..b3434dd 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -2089,7 +2089,11 @@ static unsigned int initial_ix86_tune_features[X86_TUNE_LAST] = {
/* X86_SOFTARE_PREFETCHING_BENEFICIAL: Enable software prefetching
at -O3. For the moment, the prefetching seems badly tuned for Intel
chips. */
- m_K6_GEODE | m_AMD_MULTIPLE
+ m_K6_GEODE | m_AMD_MULTIPLE,
+
+ /* X86_TUNE_AVX128_OPTIMAL: Enable 128-bit AVX instruction generation for
+ the auto-vectorizer. */
+ m_BDVER1
};
/* Feature tests against the various architecture variations. */
@@ -2623,6 +2627,7 @@ ix86_target_string (int isa, int flags, const char *arch, const char *tune,
{ "-mvzeroupper", MASK_VZEROUPPER },
{ "-mavx256-split-unaligned-load", MASK_AVX256_SPLIT_UNALIGNED_LOAD},
{ "-mavx256-split-unaligned-store", MASK_AVX256_SPLIT_UNALIGNED_STORE},
+ { "-mprefer-avx128", MASK_PREFER_AVX128},
};
const char *opts[ARRAY_SIZE (isa_opts) + ARRAY_SIZE (flag_opts) + 6][2];
@@ -3672,6 +3677,9 @@ ix86_option_override_internal (bool main_args_p)
if ((x86_avx256_split_unaligned_store & ix86_tune_mask)
&& !(target_flags_explicit & MASK_AVX256_SPLIT_UNALIGNED_STORE))
target_flags |= MASK_AVX256_SPLIT_UNALIGNED_STORE;
+ /* Enable 128-bit AVX instruction generation for the auto-vectorizer. */
+ if (TARGET_AVX128_OPTIMAL && !(target_flags_explicit & MASK_PREFER_AVX128))
+ target_flags |= MASK_PREFER_AVX128;
}
}
else
@@ -34614,7 +34622,7 @@ ix86_preferred_simd_mode (enum machine_mode mode)
return V2DImode;
case SFmode:
- if (TARGET_AVX && !flag_prefer_avx128)
+ if (TARGET_AVX && !TARGET_PREFER_AVX128)
return V8SFmode;
else
return V4SFmode;
@@ -34622,7 +34630,7 @@ ix86_preferred_simd_mode (enum machine_mode mode)
case DFmode:
if (!TARGET_VECTORIZE_DOUBLE)
return word_mode;
- else if (TARGET_AVX && !flag_prefer_avx128)
+ else if (TARGET_AVX && !TARGET_PREFER_AVX128)
return V4DFmode;
else if (TARGET_SSE2)
return V2DFmode;
@@ -34639,7 +34647,7 @@ ix86_preferred_simd_mode (enum machine_mode mode)
static unsigned int
ix86_autovectorize_vector_sizes (void)
{
- return (TARGET_AVX && !flag_prefer_avx128) ? 32 | 16 : 0;
+ return (TARGET_AVX && !TARGET_PREFER_AVX128) ? 32 | 16 : 0;
}
/* Initialize the GCC target structure. */
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 8badcbb..d9317ed 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -312,6 +312,7 @@ enum ix86_tune_indices {
X86_TUNE_OPT_AGU,
X86_TUNE_VECTORIZE_DOUBLE,
X86_TUNE_SOFTWARE_PREFETCHING_BENEFICIAL,
+ X86_TUNE_AVX128_OPTIMAL,
X86_TUNE_LAST
};
@@ -410,7 +411,8 @@ extern unsigned char ix86_tune_features[X86_TUNE_LAST];
ix86_tune_features[X86_TUNE_VECTORIZE_DOUBLE]
#define TARGET_SOFTWARE_PREFETCHING_BENEFICIAL \
ix86_tune_features[X86_TUNE_SOFTWARE_PREFETCHING_BENEFICIAL]
-
+#define TARGET_AVX128_OPTIMAL \
+ ix86_tune_features[X86_TUNE_AVX128_OPTIMAL]
/* Feature tests against the various architecture variations. */
enum ix86_arch_indices {
X86_ARCH_CMOVE, /* || TARGET_SSE */
diff --git a/gcc/config/i386/i386.opt b/gcc/config/i386/i386.opt
index 21e0def..9886b7b 100644
--- a/gcc/config/i386/i386.opt
+++ b/gcc/config/i386/i386.opt
@@ -388,7 +388,7 @@ Do dispatch scheduling if processor is bdver1 and Haifa scheduling
is selected.
mprefer-avx128
-Target Report Var(flag_prefer_avx128) Init(0)
+Target Report Mask(PREFER_AVX128) SAVE
Use 128-bit AVX instructions instead of 256-bit AVX instructions in the auto-vectorizer.
;; ISA support
--
1.7.0.4
