ref: 57cae22c1eb2289182bea4df2abc7885de7ddca3
parent: c6641709a707ccb98cbdf785428659e44d4f2c8b
parent: f1342a7b070ef61b9fbdf03e899ac2107cfcb6bd
author: Yunqing Wang <yunqingwang@google.com>
date: Thu Nov 5 15:17:13 EST 2015
Merge "Add AVX vectorized vp9_diamond_search_sad"
--- a/vp9/common/vp9_rtcd_defs.pl
+++ b/vp9/common/vp9_rtcd_defs.pl
@@ -312,7 +312,7 @@
$vp9_full_search_sad_sse4_1=vp9_full_search_sadx8;
add_proto qw/int vp9_diamond_search_sad/, "const struct macroblock *x, const struct search_site_config *cfg, struct mv *ref_mv, struct mv *best_mv, int search_param, int sad_per_bit, int *num00, const struct vp9_variance_vtable *fn_ptr, const struct mv *center_mv";
-specialize qw/vp9_diamond_search_sad/;
+specialize qw/vp9_diamond_search_sad avx/;
add_proto qw/int vp9_full_range_search/, "const struct macroblock *x, const struct search_site_config *cfg, struct mv *ref_mv, struct mv *best_mv, int search_param, int sad_per_bit, int *num00, const struct vp9_variance_vtable *fn_ptr, const struct mv *center_mv";
specialize qw/vp9_full_range_search/;
--- a/vp9/encoder/vp9_encoder.c
+++ b/vp9/encoder/vp9_encoder.c
@@ -1570,7 +1570,30 @@
#endif
#define log2f(x) (log (x) / (float) M_LOG2_E)
+/***********************************************************************
+ * Read before modifying 'cal_nmvjointsadcost' or 'cal_nmvsadcosts' *
+ ***********************************************************************
+ * The following 2 functions ('cal_nmvjointsadcost' and *+ * 'cal_nmvsadcosts') are used to calculate cost lookup tables *
+ * used by 'vp9_diamond_search_sad'. The C implementation of the *
+ * function is generic, but the AVX intrinsics optimised version *
+ * relies on the following properties of the computed tables: *
+ * For cal_nmvjointsadcost: *
+ * - mvjointsadcost[1] == mvjointsadcost[2] == mvjointsadcost[3] *
+ * For cal_nmvsadcosts: *
+ * - For all i: mvsadcost[0][i] == mvsadcost[1][i] *
+ * (Equal costs for both components) *
+ * - For all i: mvsadcost[0][i] == mvsadcost[0][-i] *
+ * (Cost function is even) *
+ * If these do not hold, then the AVX optimised version of the *
+ * 'vp9_diamond_search_sad' function cannot be used as it is, in which *
+ * case you can revert to using the C function instead. *
+ ***********************************************************************/
+
static void cal_nmvjointsadcost(int *mvjointsadcost) {+ /*********************************************************************
+ * Warning: Read the comments above before modifying this function *
+ *********************************************************************/
mvjointsadcost[0] = 600;
mvjointsadcost[1] = 300;
mvjointsadcost[2] = 300;
@@ -1578,6 +1601,9 @@
}
static void cal_nmvsadcosts(int *mvsadcost[2]) {+ /*********************************************************************
+ * Warning: Read the comments above before modifying this function *
+ *********************************************************************/
int i = 1;
mvsadcost[0][0] = 0;
@@ -1739,6 +1765,10 @@
cpi->first_time_stamp_ever = INT64_MAX;
+ /*********************************************************************
+ * Warning: Read the comments around 'cal_nmvjointsadcost' and *
+ * 'cal_nmvsadcosts' before modifying how these tables are computed. *
+ *********************************************************************/
cal_nmvjointsadcost(cpi->td.mb.nmvjointsadcost);
cpi->td.mb.nmvcost[0] = &cpi->nmvcosts[0][MV_MAX];
cpi->td.mb.nmvcost[1] = &cpi->nmvcosts[1][MV_MAX];
--- a/vp9/encoder/vp9_mcomp.c
+++ b/vp9/encoder/vp9_mcomp.c
@@ -101,12 +101,9 @@
}
void vp9_init_dsmotion_compensation(search_site_config *cfg, int stride) {- int len, ss_count = 1;
+ int len;
+ int ss_count = 0;
- cfg->ss_mv[0].col = 0;
- cfg->ss_mv[0].row = 0;
- cfg->ss_os[0] = 0;
-
for (len = MAX_FIRST_STEP; len > 0; len /= 2) {// Generate offsets for 4 search sites per step.
const MV ss_mvs[] = {{-len, 0}, {len, 0}, {0, -len}, {0, len}};@@ -117,17 +114,14 @@
}
}
- cfg->ss_count = ss_count;
cfg->searches_per_step = 4;
+ cfg->total_steps = ss_count / cfg->searches_per_step;
}
void vp9_init3smotion_compensation(search_site_config *cfg, int stride) {- int len, ss_count = 1;
+ int len;
+ int ss_count = 0;
- cfg->ss_mv[0].col = 0;
- cfg->ss_mv[0].row = 0;
- cfg->ss_os[0] = 0;
-
for (len = MAX_FIRST_STEP; len > 0; len /= 2) {// Generate offsets for 8 search sites per step.
const MV ss_mvs[8] = {@@ -141,8 +135,8 @@
}
}
- cfg->ss_count = ss_count;
cfg->searches_per_step = 8;
+ cfg->total_steps = ss_count / cfg->searches_per_step;
}
/*
@@ -1612,8 +1606,8 @@
const uint8_t *best_address;
unsigned int bestsad = INT_MAX;
- int best_site = 0;
- int last_site = 0;
+ int best_site = -1;
+ int last_site = -1;
int ref_row;
int ref_col;
@@ -1626,7 +1620,7 @@
// const search_site *ss = &cfg->ss[search_param * cfg->searches_per_step];
const MV *ss_mv = &cfg->ss_mv[search_param * cfg->searches_per_step];
const intptr_t *ss_os = &cfg->ss_os[search_param * cfg->searches_per_step];
- const int tot_steps = (cfg->ss_count / cfg->searches_per_step) - search_param;
+ const int tot_steps = (cfg->total_steps) - search_param;
const MV fcenter_mv = {center_mv->row >> 3, center_mv->col >> 3};clamp_mv(ref_mv, x->mv_col_min, x->mv_col_max, x->mv_row_min, x->mv_row_max);
@@ -1644,7 +1638,7 @@
bestsad = fn_ptr->sdf(what, what_stride, in_what, in_what_stride)
+ mvsad_err_cost(x, best_mv, &fcenter_mv, sad_per_bit);
- i = 1;
+ i = 0;
for (step = 0; step < tot_steps; step++) {int all_in = 1, t;
--- a/vp9/encoder/vp9_mcomp.h
+++ b/vp9/encoder/vp9_mcomp.h
@@ -33,10 +33,10 @@
typedef struct search_site_config {// motion search sites
- MV ss_mv[8 * MAX_MVSEARCH_STEPS + 1]; // Motion vector
- intptr_t ss_os[8 * MAX_MVSEARCH_STEPS + 1]; // Offset
- int ss_count;
+ MV ss_mv[8 * MAX_MVSEARCH_STEPS]; // Motion vector
+ intptr_t ss_os[8 * MAX_MVSEARCH_STEPS]; // Offset
int searches_per_step;
+ int total_steps;
} search_site_config;
void vp9_init_dsmotion_compensation(search_site_config *cfg, int stride);
--- /dev/null
+++ b/vp9/encoder/x86/vp9_diamond_search_sad_avx.c
@@ -1,0 +1,308 @@
+/*
+ * Copyright (c) 2015 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <emmintrin.h>
+#include <smmintrin.h>
+
+#include "vpx_dsp/vpx_dsp_common.h"
+#include "vp9/encoder/vp9_encoder.h"
+#include "vpx_ports/mem.h"
+
+#ifdef __GNUC__
+# define __likely__(v) __builtin_expect(v, 1)
+# define __unlikely__(v) __builtin_expect(v, 0)
+#else
+# define __likely__(v) (v)
+# define __unlikely__(v) (v)
+#endif
+
+static INLINE MV_JOINT_TYPE get_mv_joint(const int_mv mv) {+ // This is simplified from the C implementation to utilise that
+ // x->nmvjointsadcost[1] == x->nmvjointsadcost[2] and
+ // x->nmvjointsadcost[1] == x->nmvjointsadcost[3]
+ return mv.as_int == 0 ? 0 : 1;
+}
+
+static INLINE int mv_cost(const int_mv mv,
+ const int *joint_cost, int *const comp_cost[2]) {+ return joint_cost[get_mv_joint(mv)] +
+ comp_cost[0][mv.as_mv.row] + comp_cost[1][mv.as_mv.col];
+}
+
+static int mvsad_err_cost(const MACROBLOCK *x, const int_mv mv, const MV *ref,
+ int error_per_bit) {+ const int_mv diff = { .as_mv={ mv.as_mv.row - ref->row,+ mv.as_mv.col - ref->col } };
+ return ROUND_POWER_OF_TWO(mv_cost(diff, x->nmvjointsadcost,
+ x->nmvsadcost) * error_per_bit, 8);
+}
+
+/*****************************************************************************
+ * This function utilises 3 properties of the cost function lookup tables, *
+ * constructed in using 'cal_nmvjointsadcost' and 'cal_nmvsadcosts' in *
+ * vp9_encoder.c. *
+ * For the joint cost: *
+ * - mvjointsadcost[1] == mvjointsadcost[2] == mvjointsadcost[3] *
+ * For the component costs: *
+ * - For all i: mvsadcost[0][i] == mvsadcost[1][i] *
+ * (Equal costs for both components) *
+ * - For all i: mvsadcost[0][i] == mvsadcost[0][-i] *
+ * (Cost function is even) *
+ * If these do not hold, then this function cannot be used without *
+ * modification, in which case you can revert to using the C implementation, *
+ * which does not rely on these properties. *
+ *****************************************************************************/
+int vp9_diamond_search_sad_avx(const MACROBLOCK *x,
+ const search_site_config *cfg,
+ MV *ref_mv, MV *best_mv, int search_param,
+ int sad_per_bit, int *num00,
+ const vp9_variance_fn_ptr_t *fn_ptr,
+ const MV *center_mv) {+ const int_mv maxmv = { .as_mv={x->mv_row_max, x->mv_col_max} };+ const __m128i v_max_mv_w = _mm_set1_epi32(maxmv.as_int);
+ const int_mv minmv = { .as_mv={x->mv_row_min, x->mv_col_min} };+ const __m128i v_min_mv_w = _mm_set1_epi32(minmv.as_int);
+
+ const __m128i v_spb_d = _mm_set1_epi32(sad_per_bit);
+
+ const __m128i v_joint_cost_0_d = _mm_set1_epi32(x->nmvjointsadcost[0]);
+ const __m128i v_joint_cost_1_d = _mm_set1_epi32(x->nmvjointsadcost[1]);
+
+ // search_param determines the length of the initial step and hence the number
+ // of iterations.
+ // 0 = initial step (MAX_FIRST_STEP) pel
+ // 1 = (MAX_FIRST_STEP/2) pel,
+ // 2 = (MAX_FIRST_STEP/4) pel...
+ const MV *ss_mv = &cfg->ss_mv[cfg->searches_per_step * search_param];
+ const intptr_t *ss_os = &cfg->ss_os[cfg->searches_per_step * search_param];
+ const int tot_steps = cfg->total_steps - search_param;
+
+ const int_mv fcenter_mv = { .as_mv={center_mv->row >> 3,+ center_mv->col >> 3} };
+ const __m128i vfcmv = _mm_set1_epi32(fcenter_mv.as_int);
+
+ const int ref_row = clamp(ref_mv->row, minmv.as_mv.row, maxmv.as_mv.row);
+ const int ref_col = clamp(ref_mv->col, minmv.as_mv.col, maxmv.as_mv.col);
+
+ int_mv bmv = { .as_mv={ ref_row, ref_col} };+ int_mv new_bmv = bmv;
+ __m128i v_bmv_w = _mm_set1_epi32(bmv.as_int);
+
+ const int what_stride = x->plane[0].src.stride;
+ const uint8_t * const what = x->plane[0].src.buf;
+ const int in_what_stride = x->e_mbd.plane[0].pre[0].stride;
+ const uint8_t * const in_what = x->e_mbd.plane[0].pre[0].buf +
+ ref_row * in_what_stride + ref_col;
+
+ // Work out the start point for the search
+ const uint8_t *best_address = in_what;
+ const uint8_t *new_best_address = best_address;
+#if ARCH_X86_64
+ __m128i v_ba_q = _mm_set1_epi64x((intptr_t)best_address);
+#else
+ __m128i v_ba_d = _mm_set1_epi32((intptr_t)best_address);
+#endif
+
+ unsigned int best_sad;
+
+ int i;
+ int j;
+ int step;
+
+ // Check the starting position
+ best_sad = fn_ptr->sdf(what, what_stride, in_what, in_what_stride);
+ best_sad += mvsad_err_cost(x, bmv, &fcenter_mv.as_mv, sad_per_bit);
+
+ *num00 = 0;
+
+ for (i = 0, step = 0; step < tot_steps; step++) {+ for (j = 0; j < cfg->searches_per_step; j += 4, i += 4) {+ __m128i v_sad_d;
+ __m128i v_cost_d;
+ __m128i v_outside_d;
+ __m128i v_inside_d;
+ __m128i v_diff_mv_w;
+#if ARCH_X86_64
+ __m128i v_blocka[2];
+#else
+ __m128i v_blocka[1];
+#endif
+
+ // Compute the candidate motion vectors
+ const __m128i v_ss_mv_w = _mm_load_si128((const __m128i*)&ss_mv[i]);
+ const __m128i v_these_mv_w = _mm_add_epi16(v_bmv_w, v_ss_mv_w);
+ // Clamp them to the search bounds
+ __m128i v_these_mv_clamp_w = v_these_mv_w;
+ v_these_mv_clamp_w = _mm_min_epi16(v_these_mv_clamp_w, v_max_mv_w);
+ v_these_mv_clamp_w = _mm_max_epi16(v_these_mv_clamp_w, v_min_mv_w);
+ // The ones that did not change are inside the search area
+ v_inside_d = _mm_cmpeq_epi32(v_these_mv_clamp_w, v_these_mv_w);
+
+ // If none of them are inside, then move on
+ if (__likely__(_mm_test_all_zeros(v_inside_d, v_inside_d))) {+ continue;
+ }
+
+ // The inverse mask indicates which of the MVs are outside
+ v_outside_d = _mm_xor_si128(v_inside_d, _mm_set1_epi8(0xff));
+ // Shift right to keep the sign bit clear, we will use this later
+ // to set the cost to the maximum value.
+ v_outside_d = _mm_srli_epi32(v_outside_d, 1);
+
+ // Compute the difference MV
+ v_diff_mv_w = _mm_sub_epi16(v_these_mv_clamp_w, vfcmv);
+ // We utilise the fact that the cost function is even, and use the
+ // absolute difference. This allows us to use unsigned indexes later
+ // and reduces cache pressure somewhat as only a half of the table
+ // is ever referenced.
+ v_diff_mv_w = _mm_abs_epi16(v_diff_mv_w);
+
+ // Compute the SIMD pointer offsets.
+ {+#if ARCH_X86_64 // sizeof(intptr_t) == 8
+ // Load the offsets (could use _mm_maskload_ps here, instead of the
+ // extra 'and' but it's slower that way)
+ __m128i v_bo10_q = _mm_load_si128((const __m128i*)&ss_os[i+0]);
+ __m128i v_bo32_q = _mm_load_si128((const __m128i*)&ss_os[i+2]);
+ // Set the ones falling outside to zero
+ v_bo10_q = _mm_and_si128(v_bo10_q,
+ _mm_cvtepi32_epi64(v_inside_d));
+ v_bo32_q = _mm_and_si128(v_bo32_q,
+ _mm_unpackhi_epi32(v_inside_d, v_inside_d));
+ // Compute the candidate addresses
+ v_blocka[0] = _mm_add_epi64(v_ba_q, v_bo10_q);
+ v_blocka[1] = _mm_add_epi64(v_ba_q, v_bo32_q);
+#else // ARCH_X86 // sizeof(intptr_t) == 4
+ __m128i v_bo_d = _mm_load_si128((const __m128i*)&ss_os[i]);
+ v_bo_d = _mm_and_si128(v_bo_d, v_inside_d);
+ v_blocka[0] = _mm_add_epi32(v_ba_d, v_bo_d);
+#endif
+ }
+
+ fn_ptr->sdx4df(what, what_stride,
+ (const uint8_t **)&v_blocka[0], in_what_stride,
+ (uint32_t*)&v_sad_d);
+
+ // Look up the component cost of the residual motion vector
+ {+ const int32_t row0 = _mm_extract_epi16(v_diff_mv_w, 0);
+ const int32_t col0 = _mm_extract_epi16(v_diff_mv_w, 1);
+ const int32_t row1 = _mm_extract_epi16(v_diff_mv_w, 2);
+ const int32_t col1 = _mm_extract_epi16(v_diff_mv_w, 3);
+ const int32_t row2 = _mm_extract_epi16(v_diff_mv_w, 4);
+ const int32_t col2 = _mm_extract_epi16(v_diff_mv_w, 5);
+ const int32_t row3 = _mm_extract_epi16(v_diff_mv_w, 6);
+ const int32_t col3 = _mm_extract_epi16(v_diff_mv_w, 7);
+
+ // Note: This is a use case for vpgather in AVX2
+ const uint32_t cost0 = x->nmvsadcost[0][row0] + x->nmvsadcost[0][col0];
+ const uint32_t cost1 = x->nmvsadcost[0][row1] + x->nmvsadcost[0][col1];
+ const uint32_t cost2 = x->nmvsadcost[0][row2] + x->nmvsadcost[0][col2];
+ const uint32_t cost3 = x->nmvsadcost[0][row3] + x->nmvsadcost[0][col3];
+
+ __m128i v_cost_10_d;
+ __m128i v_cost_32_d;
+
+ v_cost_10_d = _mm_cvtsi32_si128(cost0);
+ v_cost_10_d = _mm_insert_epi32(v_cost_10_d, cost1, 1);
+
+ v_cost_32_d = _mm_cvtsi32_si128(cost2);
+ v_cost_32_d = _mm_insert_epi32(v_cost_32_d, cost3, 1);
+
+ v_cost_d = _mm_unpacklo_epi64(v_cost_10_d, v_cost_32_d);
+ }
+
+ // Now add in the joint cost
+ {+ const __m128i v_sel_d = _mm_cmpeq_epi32(v_diff_mv_w,
+ _mm_setzero_si128());
+ const __m128i v_joint_cost_d = _mm_blendv_epi8(v_joint_cost_1_d,
+ v_joint_cost_0_d,
+ v_sel_d);
+ v_cost_d = _mm_add_epi32(v_cost_d, v_joint_cost_d);
+ }
+
+ // Multiply by sad_per_bit
+ v_cost_d = _mm_mullo_epi32(v_cost_d, v_spb_d);
+ // ROUND_POWER_OF_TWO(v_cost_d, 8)
+ v_cost_d = _mm_add_epi32(v_cost_d, _mm_set1_epi32(0x80));
+ v_cost_d = _mm_srai_epi32(v_cost_d, 8);
+ // Add the cost to the sad
+ v_sad_d = _mm_add_epi32(v_sad_d, v_cost_d);
+
+ // Make the motion vectors outside the search area have max cost
+ // by or'ing in the comparison mask, this way the minimum search won't
+ // pick them.
+ v_sad_d = _mm_or_si128(v_sad_d, v_outside_d);
+
+ // Find the minimum value and index horizontally in v_sad_d
+ {+ // Try speculatively on 16 bits, so we can use the minpos intrinsic
+ const __m128i v_sad_w = _mm_packus_epi32(v_sad_d, v_sad_d);
+ const __m128i v_minp_w = _mm_minpos_epu16(v_sad_w);
+
+ uint32_t local_best_sad = _mm_extract_epi16(v_minp_w, 0);
+ uint32_t local_best_idx = _mm_extract_epi16(v_minp_w, 1);
+
+ // If the local best value is not saturated, just use it, otherwise
+ // find the horizontal minimum again the hard way on 32 bits.
+ // This is executed rarely.
+ if (__unlikely__(local_best_sad == 0xffff)) {+ __m128i v_loval_d, v_hival_d, v_loidx_d, v_hiidx_d, v_sel_d;
+
+ v_loval_d = v_sad_d;
+ v_loidx_d = _mm_set_epi32(3, 2, 1, 0);
+ v_hival_d = _mm_srli_si128(v_loval_d, 8);
+ v_hiidx_d = _mm_srli_si128(v_loidx_d, 8);
+
+ v_sel_d = _mm_cmplt_epi32(v_hival_d, v_loval_d);
+
+ v_loval_d = _mm_blendv_epi8(v_loval_d, v_hival_d, v_sel_d);
+ v_loidx_d = _mm_blendv_epi8(v_loidx_d, v_hiidx_d, v_sel_d);
+ v_hival_d = _mm_srli_si128(v_loval_d, 4);
+ v_hiidx_d = _mm_srli_si128(v_loidx_d, 4);
+
+ v_sel_d = _mm_cmplt_epi32(v_hival_d, v_loval_d);
+
+ v_loval_d = _mm_blendv_epi8(v_loval_d, v_hival_d, v_sel_d);
+ v_loidx_d = _mm_blendv_epi8(v_loidx_d, v_hiidx_d, v_sel_d);
+
+ local_best_sad = _mm_extract_epi32(v_loval_d, 0);
+ local_best_idx = _mm_extract_epi32(v_loidx_d, 0);
+ }
+
+ // Update the global minimum if the local minimum is smaller
+ if (__likely__(local_best_sad < best_sad)) {+ new_bmv = ((const int_mv *)&v_these_mv_w)[local_best_idx];
+ new_best_address = ((const uint8_t **)v_blocka)[local_best_idx];
+
+ best_sad = local_best_sad;
+ }
+ }
+ }
+
+ bmv = new_bmv;
+ best_address = new_best_address;
+
+ v_bmv_w = _mm_set1_epi32(bmv.as_int);
+#if ARCH_X86_64
+ v_ba_q = _mm_set1_epi64x((intptr_t)best_address);
+#else
+ v_ba_d = _mm_set1_epi32((intptr_t)best_address);
+#endif
+
+ if (__unlikely__(best_address == in_what)) {+ (*num00)++;
+ }
+ }
+
+ *best_mv = bmv.as_mv;
+ return best_sad;
+}
--- a/vp9/vp9cx.mk
+++ b/vp9/vp9cx.mk
@@ -96,6 +96,7 @@
VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_avg_intrin_sse2.c
VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_temporal_filter_apply_sse2.asm
VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_quantize_sse2.c
+VP9_CX_SRCS-$(HAVE_AVX) += encoder/x86/vp9_diamond_search_sad_avx.c
ifeq ($(CONFIG_VP9_HIGHBITDEPTH),yes)
VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_highbd_block_error_intrin_sse2.c
endif
--
⑨