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Remove FF_MM_SSE2/3 flags for CPUs where this is generally not faster than

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regular MMX code. Examples of this are the Core1 CPU. Instead, set a new flag,
FF_MM_SSE2/3SLOW, which can be checked for particular SSE2/3 functions that
have been checked specifically on such CPUs and are actually faster than
their MMX counterparts.

In addition, use this flag to enable particular VP8 and LPC SSE2 functions
that are faster than their MMX counterparts.

Based on a patch by Loren Merritt <lorenm AT u washington edu>.

Originally committed as revision 24340 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2010-07-19 22:38:23 +00:00
parent 1878f685c0
commit 6526976f0c
4 changed files with 29 additions and 6 deletions
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4
libavcodec/avcodec.h
View File

@ -1656,8 +1656,12 @@ typedef struct AVCodecContext {
#define FF_MM_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
#define FF_MM_SSE 0x0008 ///< SSE functions
#define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
#define FF_MM_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
///< than regular MMX/SSE (e.g. Core1)
#define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
#define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
#define FF_MM_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
///< than regular MMX/SSE (e.g. Core1)
#define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
#define FF_MM_SSE4 0x0100 ///< Penryn SSE4.1 functions
#define FF_MM_SSE42 0x0200 ///< Nehalem SSE4.2 functions

19
libavcodec/x86/cpuid.c
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@ -42,6 +42,8 @@ int mm_support(void)
int rval = 0;
int eax, ebx, ecx, edx;
int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
int family=0, model=0;
union { int i[3]; char c[12]; } vendor;
#if ARCH_X86_32
x86_reg a, c;
@ -70,10 +72,12 @@ int mm_support(void)
return 0; /* CPUID not supported */
#endif
cpuid(0, max_std_level, ebx, ecx, edx);
cpuid(0, max_std_level, vendor.i[0], vendor.i[2], vendor.i[1]);
if(max_std_level >= 1){
cpuid(1, eax, ebx, ecx, std_caps);
family = ((eax>>8)&0xf) + ((eax>>20)&0xff);
model = ((eax>>4)&0xf) + ((eax>>12)&0xf0);
if (std_caps & (1<<23))
rval |= FF_MM_MMX;
if (std_caps & (1<<25))
@ -108,13 +112,24 @@ int mm_support(void)
rval |= FF_MM_MMX2;
}
if (!strncmp(vendor.c, "GenuineIntel", 12) &&
family == 6 && (model == 9 || model == 13 || model == 14)) {
/* 6/9 (pentium-m "banias"), 6/13 (pentium-m "dothan"), and 6/14 (core1 "yonah")
* theoretically support sse2, but it's usually slower than mmx,
* so let's just pretend they don't. */
if (rval & FF_MM_SSE2) rval ^= FF_MM_SSE2SLOW|FF_MM_SSE2;
if (rval & FF_MM_SSE3) rval ^= FF_MM_SSE3SLOW|FF_MM_SSE3;
}
#if 0
av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s%s%s\n",
av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s%s%s%s%s\n",
(rval&FF_MM_MMX) ? "MMX ":"",
(rval&FF_MM_MMX2) ? "MMX2 ":"",
(rval&FF_MM_SSE) ? "SSE ":"",
(rval&FF_MM_SSE2) ? "SSE2 ":"",
(rval&FF_MM_SSE2SLOW) ? "SSE2(slow) ":"",
(rval&FF_MM_SSE3) ? "SSE3 ":"",
(rval&FF_MM_SSE3SLOW) ? "SSE3(slow) ":"",
(rval&FF_MM_SSSE3) ? "SSSE3 ":"",
(rval&FF_MM_SSE4) ? "SSE4.1 ":"",
(rval&FF_MM_SSE42) ? "SSE4.2 ":"",

5
libavcodec/x86/dsputilenc_mmx.c
View File

@ -1409,9 +1409,10 @@ void dsputilenc_init_mmx(DSPContext* c, AVCodecContext *avctx)
c->sum_abs_dctelem= sum_abs_dctelem_sse2;
c->hadamard8_diff[0]= hadamard8_diff16_sse2;
c->hadamard8_diff[1]= hadamard8_diff_sse2;
#if CONFIG_LPC
}
if (CONFIG_LPC && mm_flags & (FF_MM_SSE2|FF_MM_SSE2SLOW)) {
c->lpc_compute_autocorr = ff_lpc_compute_autocorr_sse2;
#endif
}
#if HAVE_SSSE3

7
libavcodec/x86/vp8dsp-init.c
View File

@ -328,7 +328,7 @@ av_cold void ff_vp8dsp_init_x86(VP8DSPContext* c)
c->put_vp8_bilinear_pixels_tab[0][0][0] = ff_put_vp8_pixels16_sse;
}
if (mm_flags & FF_MM_SSE2) {
if (mm_flags & (FF_MM_SSE2|FF_MM_SSE2SLOW)) {
VP8_LUMA_MC_FUNC(0, 16, sse2);
VP8_MC_FUNC(1, 8, sse2);
VP8_BILINEAR_MC_FUNC(0, 16, sse2);
@ -338,8 +338,11 @@ av_cold void ff_vp8dsp_init_x86(VP8DSPContext* c)
c->vp8_h_loop_filter_simple = ff_vp8_h_loop_filter_simple_sse2;
c->vp8_v_loop_filter16y_inner = ff_vp8_v_loop_filter16y_inner_sse2;
c->vp8_h_loop_filter16y_inner = ff_vp8_h_loop_filter16y_inner_sse2;
c->vp8_v_loop_filter8uv_inner = ff_vp8_v_loop_filter8uv_inner_sse2;
}
if (mm_flags & FF_MM_SSE2) {
c->vp8_h_loop_filter16y_inner = ff_vp8_h_loop_filter16y_inner_sse2;
c->vp8_h_loop_filter8uv_inner = ff_vp8_h_loop_filter8uv_inner_sse2;
}