generic-library/vpx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

A few more optimizations, about 1% overall speedup.

Browse Source 
Unroll horizontal pass, no more intermediate buffer, faster special transpose.

Change-Id: I05df75be4e5f01420066cdf3c61a2edf35bedb64
This commit is contained in:
Christian Duvivier 2012-08-15 22:41:32 -07:00
parent 9471bc2e9e
commit 525b183910
1 changed files with 80 additions and 76 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

156
vp8/common/x86/filter_sse4.c
View File

@ -55,6 +55,37 @@ DECLARE_ALIGNED(16, static const unsigned int, rounding_c[4]) = {
VP8_FILTER_WEIGHT >> 1,
VP8_FILTER_WEIGHT >> 1,
};
DECLARE_ALIGNED(16, static const unsigned char, transpose_c[16]) = {
0, 4, 8, 12,
1, 5, 9, 13,
2, 6, 10, 14,
3, 7, 11, 15
};
// Creating a macro to do more than four pixels at once to hide instruction
// latency is actually slower :-(
#define DO_FOUR_PIXELS(result, offset) \
{ \
/*load pixels*/ \
__m128i src = _mm_loadu_si128((const __m128i *)(src_ptr + offset)); \
/* extract the ones used for first column */ \
__m128i src0123 = _mm_shuffle_epi8(src, mask0123); \
__m128i src4567 = _mm_shuffle_epi8(src, mask4567); \
__m128i src01_16 = _mm_unpacklo_epi8(src0123, zero); \
__m128i src23_16 = _mm_unpackhi_epi8(src0123, zero); \
__m128i src45_16 = _mm_unpacklo_epi8(src4567, zero); \
__m128i src67_16 = _mm_unpackhi_epi8(src4567, zero); \
/* multiply accumulate them */ \
__m128i mad01 = _mm_madd_epi16(src01_16, fil01); \
__m128i mad23 = _mm_madd_epi16(src23_16, fil23); \
__m128i mad45 = _mm_madd_epi16(src45_16, fil45); \
__m128i mad67 = _mm_madd_epi16(src67_16, fil67); \
__m128i mad0123 = _mm_add_epi32(mad01, mad23); \
__m128i mad4567 = _mm_add_epi32(mad45, mad67); \
__m128i mad_all = _mm_add_epi32(mad0123, mad4567); \
mad_all = _mm_add_epi32(mad_all, rounding); \
result = _mm_srai_epi32(mad_all, VP8_FILTER_SHIFT); \
}
void vp8_filter_block2d_4x4_8_sse4_1
(
@ -62,19 +93,16 @@ void vp8_filter_block2d_4x4_8_sse4_1
const short *HFilter_aligned16, const short *VFilter_aligned16,
unsigned char *dst_ptr, unsigned int dst_stride
) {
const unsigned int output_height_div4 = 1;
__m128i intermediateA, intermediateB, intermediateC;
DECLARE_ALIGNED(16, unsigned char, intermediate_buffer[4 * 12]);
const int kInterp_Extend = 4;
const unsigned int output_height = output_height_div4 * 4 - 1 +
2 * kInterp_Extend;
const __m128i zero = _mm_set1_epi16(0);
const __m128i mask0123 = _mm_load_si128((const __m128i *)mask0123_c);
const __m128i mask4567 = _mm_load_si128((const __m128i *)mask4567_c);
const __m128i rounding = _mm_load_si128((const __m128i *)rounding_c);
const __m128i transpose = _mm_load_si128((const __m128i *)transpose_c);
unsigned int i;
// check alignment
assert(0 == ((long)HFilter_aligned16)%16);
assert(0 == ((long)VFilter_aligned16)%16);
@ -87,7 +115,6 @@ void vp8_filter_block2d_4x4_8_sse4_1
// Horizontal pass (src -> intermediate).
{
unsigned char *output_ptr = intermediate_buffer;
const __m128i HFilter = _mm_load_si128((const __m128i *)HFilter_aligned16);
// get first two columns filter coefficients
__m128i fil01 = _mm_shuffle_epi32(HFilter, _MM_SHUFFLE(0, 0, 0, 0));
@ -96,94 +123,71 @@ void vp8_filter_block2d_4x4_8_sse4_1
__m128i fil67 = _mm_shuffle_epi32(HFilter, _MM_SHUFFLE(3, 3, 3, 3));
src_ptr -= (kInterp_Extend - 1) * src_stride + (kInterp_Extend - 1);
for (i = 0; i < output_height; i++) {
//load pixels
__m128i src = _mm_loadu_si128((const __m128i *)src_ptr);
// extract the ones used for first column
__m128i src0123 = _mm_shuffle_epi8(src, mask0123);
__m128i src4567 = _mm_shuffle_epi8(src, mask4567);
__m128i src01_16 = _mm_unpacklo_epi8(src0123, zero);
__m128i src23_16 = _mm_unpackhi_epi8(src0123, zero);
__m128i src45_16 = _mm_unpacklo_epi8(src4567, zero);
__m128i src67_16 = _mm_unpackhi_epi8(src4567, zero);
// multiply accumulate them
__m128i mad01 = _mm_madd_epi16(src01_16, fil01);
__m128i mad23 = _mm_madd_epi16(src23_16, fil23);
__m128i mad45 = _mm_madd_epi16(src45_16, fil45);
__m128i mad67 = _mm_madd_epi16(src67_16, fil67);
__m128i mad0123 = _mm_add_epi32(mad01, mad23);
__m128i mad4567 = _mm_add_epi32(mad45, mad67);
__m128i mad_all = _mm_add_epi32(mad0123, mad4567);
mad_all = _mm_add_epi32(mad_all, rounding);
mad_all = _mm_srai_epi32(mad_all, VP8_FILTER_SHIFT);
mad_all = _mm_packs_epi32(mad_all, mad_all);
mad_all = _mm_packus_epi16(mad_all, mad_all);
*((unsigned int *)output_ptr) = _mm_extract_epi32(mad_all, 0);
//TODO(cd): look into Ronald's comment:
// future suggestion: use movd, not pextrd(0).
//
// Alternatively, you could unroll this loop somewhat to handle 2
// or 4 lines at a time, so that the packs_epi32() and the
// packus_epi16() handle a full register worth of data. Then again,
// you might have to specialcase the last line since you have 11
// lines to handle here, and you don't want to handle a 12th dummy
// line, so overall I'm not sure it's worth it. Use your best
// judgement. :-).
// next row
src_ptr += src_stride;
output_ptr += 4;
{
__m128i mad_all0;
__m128i mad_all1;
__m128i mad_all2;
__m128i mad_all3;
DO_FOUR_PIXELS(mad_all0, 0*src_stride)
DO_FOUR_PIXELS(mad_all1, 1*src_stride)
DO_FOUR_PIXELS(mad_all2, 2*src_stride)
DO_FOUR_PIXELS(mad_all3, 3*src_stride)
mad_all0 = _mm_packs_epi32(mad_all0, mad_all1);
mad_all2 = _mm_packs_epi32(mad_all2, mad_all3);
intermediateA = _mm_packus_epi16(mad_all0, mad_all2);
// --
src_ptr += src_stride*4;
// --
DO_FOUR_PIXELS(mad_all0, 0*src_stride)
DO_FOUR_PIXELS(mad_all1, 1*src_stride)
DO_FOUR_PIXELS(mad_all2, 2*src_stride)
DO_FOUR_PIXELS(mad_all3, 3*src_stride)
mad_all0 = _mm_packs_epi32(mad_all0, mad_all1);
mad_all2 = _mm_packs_epi32(mad_all2, mad_all3);
intermediateB = _mm_packus_epi16(mad_all0, mad_all2);
// --
src_ptr += src_stride*4;
// --
DO_FOUR_PIXELS(mad_all0, 0*src_stride)
DO_FOUR_PIXELS(mad_all1, 1*src_stride)
DO_FOUR_PIXELS(mad_all2, 2*src_stride)
mad_all0 = _mm_packs_epi32(mad_all0, mad_all1);
mad_all2 = _mm_packs_epi32(mad_all2, mad_all2);
intermediateC = _mm_packus_epi16(mad_all0, mad_all2);
}
}
// Transpose result (intermediate -> transpose3_x)
{
const __m128i srcA = _mm_load_si128((__m128i *)(&intermediate_buffer[ 0]));
const __m128i srcB = _mm_load_si128((__m128i *)(&intermediate_buffer[16]));
const __m128i srcC = _mm_load_si128((__m128i *)(&intermediate_buffer[32]));
// 00 01 02 03 10 11 12 13 20 21 22 23 30 31 32 33
// 40 41 42 43 50 51 52 53 60 61 62 63 70 71 72 73
// 80 81 82 83 90 91 92 93 A0 A1 A2 A3 xx xx xx xx
const __m128i transpose0_0 = _mm_unpacklo_epi8(srcA, srcB);
const __m128i transpose0_1 = _mm_unpackhi_epi8(srcA, srcB);
const __m128i transpose0_2 = _mm_unpacklo_epi8(srcC, srcC);
const __m128i transpose0_3 = _mm_unpackhi_epi8(srcC, srcC);
// 00 40 01 41 02 42 03 43 10 50 11 51 12 52 13 53
// 20 60 21 61 22 62 23 63 30 70 31 71 32 72 33 73
// 80 xx 81 xx 82 xx 83 xx 90 xx 91 xx 92 xx 93 xx
// A0 xx A1 xx A2 xx A3 xx xx xx xx xx xx xx xx xx
const __m128i transpose1_0 = _mm_unpacklo_epi8(transpose0_0, transpose0_1);
const __m128i transpose1_1 = _mm_unpackhi_epi8(transpose0_0, transpose0_1);
const __m128i transpose1_2 = _mm_unpacklo_epi8(transpose0_2, transpose0_3);
const __m128i transpose1_3 = _mm_unpackhi_epi8(transpose0_2, transpose0_3);
// 00 20 40 60 01 21 41 61 02 22 42 62 03 23 43 63
// 10 30 50 70 11 31 51 71 12 32 52 72 13 33 53 73
// 80 A0 xx xx 81 A1 xx xx 82 A2 xx xx 83 A3 xx xx
// 90 xx xx xx 91 xx xx xx 92 xx xx xx 93 xx xx xx
const __m128i transpose2_0 = _mm_unpacklo_epi8(transpose1_0, transpose1_1);
const __m128i transpose2_1 = _mm_unpackhi_epi8(transpose1_0, transpose1_1);
const __m128i transpose2_2 = _mm_unpacklo_epi8(transpose1_2, transpose1_3);
const __m128i transpose2_3 = _mm_unpackhi_epi8(transpose1_2, transpose1_3);
const __m128i transpose1_0 = _mm_shuffle_epi8(intermediateA, transpose);
const __m128i transpose1_1 = _mm_shuffle_epi8(intermediateB, transpose);
const __m128i transpose1_2 = _mm_shuffle_epi8(intermediateC, transpose);
// 00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33
// 40 50 60 70 41 51 61 71 42 52 62 72 43 53 63 73
// 80 90 A0 xx 81 91 A1 xx 82 92 A2 xx 83 93 A3 xx
const __m128i transpose2_0 = _mm_unpacklo_epi32(transpose1_0, transpose1_1);
const __m128i transpose2_1 = _mm_unpackhi_epi32(transpose1_0, transpose1_1);
// 00 10 20 30 40 50 60 70 01 11 21 31 41 51 61 71
// 02 12 22 32 42 52 62 72 03 13 23 33 43 53 63 73
// 80 90 A0 xx xx xx xx xx 81 91 A1 xx xx xx xx xx
// 82 92 A2 xx xx xx xx xx 83 93 A3 xx xx xx xx xx
transpose3_0 = _mm_castps_si128(
_mm_shuffle_ps(_mm_castsi128_ps(transpose2_0),
_mm_castsi128_ps(transpose2_2),
_MM_SHUFFLE(1, 0, 1, 0)));
_mm_castsi128_ps(transpose1_2),
_MM_SHUFFLE(0, 0, 1, 0)));
transpose3_1 = _mm_castps_si128(
_mm_shuffle_ps(_mm_castsi128_ps(transpose2_0),
_mm_castsi128_ps(transpose2_2),
_MM_SHUFFLE(3, 2, 3, 2)));
_mm_castsi128_ps(transpose1_2),
_MM_SHUFFLE(1, 1, 3, 2)));
transpose3_2 = _mm_castps_si128(
_mm_shuffle_ps(_mm_castsi128_ps(transpose2_1),
_mm_castsi128_ps(transpose2_3),
_MM_SHUFFLE(1, 0, 1, 0)));
_mm_castsi128_ps(transpose1_2),
_MM_SHUFFLE(2, 2, 1, 0)));
transpose3_3 = _mm_castps_si128(
_mm_shuffle_ps(_mm_castsi128_ps(transpose2_1),
_mm_castsi128_ps(transpose2_3),
_MM_SHUFFLE(3, 2, 3, 2)));
_mm_castsi128_ps(transpose1_2),
_MM_SHUFFLE(3, 3, 3, 2)));
// 00 10 20 30 40 50 60 70 80 90 A0 xx xx xx xx xx
// 01 11 21 31 41 51 61 71 81 91 A1 xx xx xx xx xx
// 02 12 22 32 42 52 62 72 82 92 A2 xx xx xx xx xx