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-rw-r--r--third_party/aom/aom_dsp/x86/sum_squares_sse2.c478
1 files changed, 478 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/x86/sum_squares_sse2.c b/third_party/aom/aom_dsp/x86/sum_squares_sse2.c
new file mode 100644
index 0000000000..cf3ed98974
--- /dev/null
+++ b/third_party/aom/aom_dsp/x86/sum_squares_sse2.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <assert.h>
+#include <emmintrin.h>
+#include <stdio.h>
+
+#include "aom_dsp/x86/synonyms.h"
+#include "aom_dsp/x86/sum_squares_sse2.h"
+#include "config/aom_dsp_rtcd.h"
+
+static INLINE __m128i xx_loadh_64(__m128i a, const void *b) {
+ const __m128d ad = _mm_castsi128_pd(a);
+ return _mm_castpd_si128(_mm_loadh_pd(ad, (double *)b));
+}
+
+static INLINE uint64_t xx_cvtsi128_si64(__m128i a) {
+#if AOM_ARCH_X86_64
+ return (uint64_t)_mm_cvtsi128_si64(a);
+#else
+ {
+ uint64_t tmp;
+ _mm_storel_epi64((__m128i *)&tmp, a);
+ return tmp;
+ }
+#endif
+}
+
+static INLINE __m128i sum_squares_i16_4x4_sse2(const int16_t *src, int stride) {
+ const __m128i v_val_0_w = xx_loadl_64(src + 0 * stride);
+ const __m128i v_val_2_w = xx_loadl_64(src + 2 * stride);
+ const __m128i v_val_01_w = xx_loadh_64(v_val_0_w, src + 1 * stride);
+ const __m128i v_val_23_w = xx_loadh_64(v_val_2_w, src + 3 * stride);
+ const __m128i v_sq_01_d = _mm_madd_epi16(v_val_01_w, v_val_01_w);
+ const __m128i v_sq_23_d = _mm_madd_epi16(v_val_23_w, v_val_23_w);
+
+ return _mm_add_epi32(v_sq_01_d, v_sq_23_d);
+}
+
+uint64_t aom_sum_squares_2d_i16_4x4_sse2(const int16_t *src, int stride) {
+ const __m128i v_sum_0123_d = sum_squares_i16_4x4_sse2(src, stride);
+ __m128i v_sum_d =
+ _mm_add_epi32(v_sum_0123_d, _mm_srli_epi64(v_sum_0123_d, 32));
+ v_sum_d = _mm_add_epi32(v_sum_d, _mm_srli_si128(v_sum_d, 8));
+ return (uint64_t)_mm_cvtsi128_si32(v_sum_d);
+}
+
+uint64_t aom_sum_sse_2d_i16_4x4_sse2(const int16_t *src, int stride, int *sum) {
+ const __m128i one_reg = _mm_set1_epi16(1);
+ const __m128i v_val_0_w = xx_loadl_64(src + 0 * stride);
+ const __m128i v_val_2_w = xx_loadl_64(src + 2 * stride);
+ __m128i v_val_01_w = xx_loadh_64(v_val_0_w, src + 1 * stride);
+ __m128i v_val_23_w = xx_loadh_64(v_val_2_w, src + 3 * stride);
+
+ __m128i v_sum_0123_d = _mm_add_epi16(v_val_01_w, v_val_23_w);
+ v_sum_0123_d = _mm_madd_epi16(v_sum_0123_d, one_reg);
+ v_sum_0123_d = _mm_add_epi32(v_sum_0123_d, _mm_srli_si128(v_sum_0123_d, 8));
+ v_sum_0123_d = _mm_add_epi32(v_sum_0123_d, _mm_srli_si128(v_sum_0123_d, 4));
+ *sum = _mm_cvtsi128_si32(v_sum_0123_d);
+
+ const __m128i v_sq_01_d = _mm_madd_epi16(v_val_01_w, v_val_01_w);
+ const __m128i v_sq_23_d = _mm_madd_epi16(v_val_23_w, v_val_23_w);
+ __m128i v_sq_0123_d = _mm_add_epi32(v_sq_01_d, v_sq_23_d);
+ v_sq_0123_d = _mm_add_epi32(v_sq_0123_d, _mm_srli_si128(v_sq_0123_d, 8));
+ v_sq_0123_d = _mm_add_epi32(v_sq_0123_d, _mm_srli_si128(v_sq_0123_d, 4));
+ return (uint64_t)_mm_cvtsi128_si32(v_sq_0123_d);
+}
+
+uint64_t aom_sum_squares_2d_i16_4xn_sse2(const int16_t *src, int stride,
+ int height) {
+ int r = 0;
+ __m128i v_acc_q = _mm_setzero_si128();
+ do {
+ const __m128i v_acc_d = sum_squares_i16_4x4_sse2(src, stride);
+ v_acc_q = _mm_add_epi32(v_acc_q, v_acc_d);
+ src += stride << 2;
+ r += 4;
+ } while (r < height);
+ const __m128i v_zext_mask_q = xx_set1_64_from_32i(~0);
+ __m128i v_acc_64 = _mm_add_epi64(_mm_srli_epi64(v_acc_q, 32),
+ _mm_and_si128(v_acc_q, v_zext_mask_q));
+ v_acc_64 = _mm_add_epi64(v_acc_64, _mm_srli_si128(v_acc_64, 8));
+ return xx_cvtsi128_si64(v_acc_64);
+}
+
+uint64_t aom_sum_sse_2d_i16_4xn_sse2(const int16_t *src, int stride, int height,
+ int *sum) {
+ int r = 0;
+ uint64_t sse = 0;
+ do {
+ int curr_sum = 0;
+ sse += aom_sum_sse_2d_i16_4x4_sse2(src, stride, &curr_sum);
+ *sum += curr_sum;
+ src += stride << 2;
+ r += 4;
+ } while (r < height);
+ return sse;
+}
+
+#ifdef __GNUC__
+// This prevents GCC/Clang from inlining this function into
+// aom_sum_squares_2d_i16_sse2, which in turn saves some stack
+// maintenance instructions in the common case of 4x4.
+__attribute__((noinline))
+#endif
+uint64_t
+aom_sum_squares_2d_i16_nxn_sse2(const int16_t *src, int stride, int width,
+ int height) {
+ int r = 0;
+
+ const __m128i v_zext_mask_q = xx_set1_64_from_32i(~0);
+ __m128i v_acc_q = _mm_setzero_si128();
+
+ do {
+ __m128i v_acc_d = _mm_setzero_si128();
+ int c = 0;
+ do {
+ const int16_t *b = src + c;
+
+ const __m128i v_val_0_w = xx_load_128(b + 0 * stride);
+ const __m128i v_val_1_w = xx_load_128(b + 1 * stride);
+ const __m128i v_val_2_w = xx_load_128(b + 2 * stride);
+ const __m128i v_val_3_w = xx_load_128(b + 3 * stride);
+
+ const __m128i v_sq_0_d = _mm_madd_epi16(v_val_0_w, v_val_0_w);
+ const __m128i v_sq_1_d = _mm_madd_epi16(v_val_1_w, v_val_1_w);
+ const __m128i v_sq_2_d = _mm_madd_epi16(v_val_2_w, v_val_2_w);
+ const __m128i v_sq_3_d = _mm_madd_epi16(v_val_3_w, v_val_3_w);
+
+ const __m128i v_sum_01_d = _mm_add_epi32(v_sq_0_d, v_sq_1_d);
+ const __m128i v_sum_23_d = _mm_add_epi32(v_sq_2_d, v_sq_3_d);
+
+ const __m128i v_sum_0123_d = _mm_add_epi32(v_sum_01_d, v_sum_23_d);
+
+ v_acc_d = _mm_add_epi32(v_acc_d, v_sum_0123_d);
+ c += 8;
+ } while (c < width);
+
+ v_acc_q = _mm_add_epi64(v_acc_q, _mm_and_si128(v_acc_d, v_zext_mask_q));
+ v_acc_q = _mm_add_epi64(v_acc_q, _mm_srli_epi64(v_acc_d, 32));
+
+ src += 4 * stride;
+ r += 4;
+ } while (r < height);
+
+ v_acc_q = _mm_add_epi64(v_acc_q, _mm_srli_si128(v_acc_q, 8));
+ return xx_cvtsi128_si64(v_acc_q);
+}
+
+#ifdef __GNUC__
+// This prevents GCC/Clang from inlining this function into
+// aom_sum_sse_2d_i16_nxn_sse2, which in turn saves some stack
+// maintenance instructions in the common case of 4x4.
+__attribute__((noinline))
+#endif
+uint64_t
+aom_sum_sse_2d_i16_nxn_sse2(const int16_t *src, int stride, int width,
+ int height, int *sum) {
+ int r = 0;
+ uint64_t result;
+ const __m128i zero_reg = _mm_setzero_si128();
+ const __m128i one_reg = _mm_set1_epi16(1);
+
+ __m128i v_sse_total = zero_reg;
+ __m128i v_sum_total = zero_reg;
+
+ do {
+ int c = 0;
+ __m128i v_sse_row = zero_reg;
+ do {
+ const int16_t *b = src + c;
+
+ __m128i v_val_0_w = xx_load_128(b + 0 * stride);
+ __m128i v_val_1_w = xx_load_128(b + 1 * stride);
+ __m128i v_val_2_w = xx_load_128(b + 2 * stride);
+ __m128i v_val_3_w = xx_load_128(b + 3 * stride);
+
+ const __m128i v_sq_0_d = _mm_madd_epi16(v_val_0_w, v_val_0_w);
+ const __m128i v_sq_1_d = _mm_madd_epi16(v_val_1_w, v_val_1_w);
+ const __m128i v_sq_2_d = _mm_madd_epi16(v_val_2_w, v_val_2_w);
+ const __m128i v_sq_3_d = _mm_madd_epi16(v_val_3_w, v_val_3_w);
+ const __m128i v_sq_01_d = _mm_add_epi32(v_sq_0_d, v_sq_1_d);
+ const __m128i v_sq_23_d = _mm_add_epi32(v_sq_2_d, v_sq_3_d);
+ const __m128i v_sq_0123_d = _mm_add_epi32(v_sq_01_d, v_sq_23_d);
+ v_sse_row = _mm_add_epi32(v_sse_row, v_sq_0123_d);
+
+ const __m128i v_sum_01 = _mm_add_epi16(v_val_0_w, v_val_1_w);
+ const __m128i v_sum_23 = _mm_add_epi16(v_val_2_w, v_val_3_w);
+ __m128i v_sum_0123_d = _mm_add_epi16(v_sum_01, v_sum_23);
+ v_sum_0123_d = _mm_madd_epi16(v_sum_0123_d, one_reg);
+ v_sum_total = _mm_add_epi32(v_sum_total, v_sum_0123_d);
+
+ c += 8;
+ } while (c < width);
+
+ const __m128i v_sse_row_low = _mm_unpacklo_epi32(v_sse_row, zero_reg);
+ const __m128i v_sse_row_hi = _mm_unpackhi_epi32(v_sse_row, zero_reg);
+ v_sse_row = _mm_add_epi64(v_sse_row_low, v_sse_row_hi);
+ v_sse_total = _mm_add_epi64(v_sse_total, v_sse_row);
+ src += 4 * stride;
+ r += 4;
+ } while (r < height);
+
+ v_sum_total = _mm_add_epi32(v_sum_total, _mm_srli_si128(v_sum_total, 8));
+ v_sum_total = _mm_add_epi32(v_sum_total, _mm_srli_si128(v_sum_total, 4));
+ *sum += _mm_cvtsi128_si32(v_sum_total);
+
+ v_sse_total = _mm_add_epi64(v_sse_total, _mm_srli_si128(v_sse_total, 8));
+ xx_storel_64(&result, v_sse_total);
+ return result;
+}
+
+uint64_t aom_sum_squares_2d_i16_sse2(const int16_t *src, int stride, int width,
+ int height) {
+ // 4 elements per row only requires half an XMM register, so this
+ // must be a special case, but also note that over 75% of all calls
+ // are with size == 4, so it is also the common case.
+ if (LIKELY(width == 4 && height == 4)) {
+ return aom_sum_squares_2d_i16_4x4_sse2(src, stride);
+ } else if (LIKELY(width == 4 && (height & 3) == 0)) {
+ return aom_sum_squares_2d_i16_4xn_sse2(src, stride, height);
+ } else if (LIKELY((width & 7) == 0 && (height & 3) == 0)) {
+ // Generic case
+ return aom_sum_squares_2d_i16_nxn_sse2(src, stride, width, height);
+ } else {
+ return aom_sum_squares_2d_i16_c(src, stride, width, height);
+ }
+}
+
+uint64_t aom_sum_sse_2d_i16_sse2(const int16_t *src, int src_stride, int width,
+ int height, int *sum) {
+ if (LIKELY(width == 4 && height == 4)) {
+ return aom_sum_sse_2d_i16_4x4_sse2(src, src_stride, sum);
+ } else if (LIKELY(width == 4 && (height & 3) == 0)) {
+ return aom_sum_sse_2d_i16_4xn_sse2(src, src_stride, height, sum);
+ } else if (LIKELY((width & 7) == 0 && (height & 3) == 0)) {
+ // Generic case
+ return aom_sum_sse_2d_i16_nxn_sse2(src, src_stride, width, height, sum);
+ } else {
+ return aom_sum_sse_2d_i16_c(src, src_stride, width, height, sum);
+ }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+// 1D version
+//////////////////////////////////////////////////////////////////////////////
+
+static uint64_t aom_sum_squares_i16_64n_sse2(const int16_t *src, uint32_t n) {
+ const __m128i v_zext_mask_q = xx_set1_64_from_32i(~0);
+ __m128i v_acc0_q = _mm_setzero_si128();
+ __m128i v_acc1_q = _mm_setzero_si128();
+
+ const int16_t *const end = src + n;
+
+ assert(n % 64 == 0);
+
+ while (src < end) {
+ const __m128i v_val_0_w = xx_load_128(src);
+ const __m128i v_val_1_w = xx_load_128(src + 8);
+ const __m128i v_val_2_w = xx_load_128(src + 16);
+ const __m128i v_val_3_w = xx_load_128(src + 24);
+ const __m128i v_val_4_w = xx_load_128(src + 32);
+ const __m128i v_val_5_w = xx_load_128(src + 40);
+ const __m128i v_val_6_w = xx_load_128(src + 48);
+ const __m128i v_val_7_w = xx_load_128(src + 56);
+
+ const __m128i v_sq_0_d = _mm_madd_epi16(v_val_0_w, v_val_0_w);
+ const __m128i v_sq_1_d = _mm_madd_epi16(v_val_1_w, v_val_1_w);
+ const __m128i v_sq_2_d = _mm_madd_epi16(v_val_2_w, v_val_2_w);
+ const __m128i v_sq_3_d = _mm_madd_epi16(v_val_3_w, v_val_3_w);
+ const __m128i v_sq_4_d = _mm_madd_epi16(v_val_4_w, v_val_4_w);
+ const __m128i v_sq_5_d = _mm_madd_epi16(v_val_5_w, v_val_5_w);
+ const __m128i v_sq_6_d = _mm_madd_epi16(v_val_6_w, v_val_6_w);
+ const __m128i v_sq_7_d = _mm_madd_epi16(v_val_7_w, v_val_7_w);
+
+ const __m128i v_sum_01_d = _mm_add_epi32(v_sq_0_d, v_sq_1_d);
+ const __m128i v_sum_23_d = _mm_add_epi32(v_sq_2_d, v_sq_3_d);
+ const __m128i v_sum_45_d = _mm_add_epi32(v_sq_4_d, v_sq_5_d);
+ const __m128i v_sum_67_d = _mm_add_epi32(v_sq_6_d, v_sq_7_d);
+
+ const __m128i v_sum_0123_d = _mm_add_epi32(v_sum_01_d, v_sum_23_d);
+ const __m128i v_sum_4567_d = _mm_add_epi32(v_sum_45_d, v_sum_67_d);
+
+ const __m128i v_sum_d = _mm_add_epi32(v_sum_0123_d, v_sum_4567_d);
+
+ v_acc0_q = _mm_add_epi64(v_acc0_q, _mm_and_si128(v_sum_d, v_zext_mask_q));
+ v_acc1_q = _mm_add_epi64(v_acc1_q, _mm_srli_epi64(v_sum_d, 32));
+
+ src += 64;
+ }
+
+ v_acc0_q = _mm_add_epi64(v_acc0_q, v_acc1_q);
+ v_acc0_q = _mm_add_epi64(v_acc0_q, _mm_srli_si128(v_acc0_q, 8));
+ return xx_cvtsi128_si64(v_acc0_q);
+}
+
+uint64_t aom_sum_squares_i16_sse2(const int16_t *src, uint32_t n) {
+ if (n % 64 == 0) {
+ return aom_sum_squares_i16_64n_sse2(src, n);
+ } else if (n > 64) {
+ const uint32_t k = n & ~63u;
+ return aom_sum_squares_i16_64n_sse2(src, k) +
+ aom_sum_squares_i16_c(src + k, n - k);
+ } else {
+ return aom_sum_squares_i16_c(src, n);
+ }
+}
+
+// Accumulate sum of 16-bit elements in the vector
+static AOM_INLINE int32_t mm_accumulate_epi16(__m128i vec_a) {
+ __m128i vtmp = _mm_srli_si128(vec_a, 8);
+ vec_a = _mm_add_epi16(vec_a, vtmp);
+ vtmp = _mm_srli_si128(vec_a, 4);
+ vec_a = _mm_add_epi16(vec_a, vtmp);
+ vtmp = _mm_srli_si128(vec_a, 2);
+ vec_a = _mm_add_epi16(vec_a, vtmp);
+ return _mm_extract_epi16(vec_a, 0);
+}
+
+// Accumulate sum of 32-bit elements in the vector
+static AOM_INLINE int32_t mm_accumulate_epi32(__m128i vec_a) {
+ __m128i vtmp = _mm_srli_si128(vec_a, 8);
+ vec_a = _mm_add_epi32(vec_a, vtmp);
+ vtmp = _mm_srli_si128(vec_a, 4);
+ vec_a = _mm_add_epi32(vec_a, vtmp);
+ return _mm_cvtsi128_si32(vec_a);
+}
+
+uint64_t aom_var_2d_u8_sse2(uint8_t *src, int src_stride, int width,
+ int height) {
+ uint8_t *srcp;
+ uint64_t s = 0, ss = 0;
+ __m128i vzero = _mm_setzero_si128();
+ __m128i v_acc_sum = vzero;
+ __m128i v_acc_sqs = vzero;
+ int i, j;
+
+ // Process 16 elements in a row
+ for (i = 0; i < width - 15; i += 16) {
+ srcp = src + i;
+ // Process 8 columns at a time
+ for (j = 0; j < height - 7; j += 8) {
+ __m128i vsrc[8];
+ for (int k = 0; k < 8; k++) {
+ vsrc[k] = _mm_loadu_si128((__m128i *)srcp);
+ srcp += src_stride;
+ }
+ for (int k = 0; k < 8; k++) {
+ __m128i vsrc0 = _mm_unpacklo_epi8(vsrc[k], vzero);
+ __m128i vsrc1 = _mm_unpackhi_epi8(vsrc[k], vzero);
+ v_acc_sum = _mm_add_epi16(v_acc_sum, vsrc0);
+ v_acc_sum = _mm_add_epi16(v_acc_sum, vsrc1);
+
+ __m128i vsqs0 = _mm_madd_epi16(vsrc0, vsrc0);
+ __m128i vsqs1 = _mm_madd_epi16(vsrc1, vsrc1);
+ v_acc_sqs = _mm_add_epi32(v_acc_sqs, vsqs0);
+ v_acc_sqs = _mm_add_epi32(v_acc_sqs, vsqs1);
+ }
+
+ // Update total sum and clear the vectors
+ s += mm_accumulate_epi16(v_acc_sum);
+ ss += mm_accumulate_epi32(v_acc_sqs);
+ v_acc_sum = vzero;
+ v_acc_sqs = vzero;
+ }
+
+ // Process remaining rows (height not a multiple of 8)
+ for (; j < height; j++) {
+ __m128i vsrc = _mm_loadu_si128((__m128i *)srcp);
+ __m128i vsrc0 = _mm_unpacklo_epi8(vsrc, vzero);
+ __m128i vsrc1 = _mm_unpackhi_epi8(vsrc, vzero);
+ v_acc_sum = _mm_add_epi16(v_acc_sum, vsrc0);
+ v_acc_sum = _mm_add_epi16(v_acc_sum, vsrc1);
+
+ __m128i vsqs0 = _mm_madd_epi16(vsrc0, vsrc0);
+ __m128i vsqs1 = _mm_madd_epi16(vsrc1, vsrc1);
+ v_acc_sqs = _mm_add_epi32(v_acc_sqs, vsqs0);
+ v_acc_sqs = _mm_add_epi32(v_acc_sqs, vsqs1);
+
+ srcp += src_stride;
+ }
+
+ // Update total sum and clear the vectors
+ s += mm_accumulate_epi16(v_acc_sum);
+ ss += mm_accumulate_epi32(v_acc_sqs);
+ v_acc_sum = vzero;
+ v_acc_sqs = vzero;
+ }
+
+ // Process the remaining area using C
+ srcp = src;
+ for (int k = 0; k < height; k++) {
+ for (int m = i; m < width; m++) {
+ uint8_t val = srcp[m];
+ s += val;
+ ss += val * val;
+ }
+ srcp += src_stride;
+ }
+ return (ss - s * s / (width * height));
+}
+
+uint64_t aom_var_2d_u16_sse2(uint8_t *src, int src_stride, int width,
+ int height) {
+ uint16_t *srcp1 = CONVERT_TO_SHORTPTR(src), *srcp;
+ uint64_t s = 0, ss = 0;
+ __m128i vzero = _mm_setzero_si128();
+ __m128i v_acc_sum = vzero;
+ __m128i v_acc_sqs = vzero;
+ int i, j;
+
+ // Process 8 elements in a row
+ for (i = 0; i < width - 8; i += 8) {
+ srcp = srcp1 + i;
+ // Process 8 columns at a time
+ for (j = 0; j < height - 8; j += 8) {
+ __m128i vsrc[8];
+ for (int k = 0; k < 8; k++) {
+ vsrc[k] = _mm_loadu_si128((__m128i *)srcp);
+ srcp += src_stride;
+ }
+ for (int k = 0; k < 8; k++) {
+ __m128i vsrc0 = _mm_unpacklo_epi16(vsrc[k], vzero);
+ __m128i vsrc1 = _mm_unpackhi_epi16(vsrc[k], vzero);
+ v_acc_sum = _mm_add_epi32(vsrc0, v_acc_sum);
+ v_acc_sum = _mm_add_epi32(vsrc1, v_acc_sum);
+
+ __m128i vsqs0 = _mm_madd_epi16(vsrc[k], vsrc[k]);
+ v_acc_sqs = _mm_add_epi32(v_acc_sqs, vsqs0);
+ }
+
+ // Update total sum and clear the vectors
+ s += mm_accumulate_epi32(v_acc_sum);
+ ss += mm_accumulate_epi32(v_acc_sqs);
+ v_acc_sum = vzero;
+ v_acc_sqs = vzero;
+ }
+
+ // Process remaining rows (height not a multiple of 8)
+ for (; j < height; j++) {
+ __m128i vsrc = _mm_loadu_si128((__m128i *)srcp);
+ __m128i vsrc0 = _mm_unpacklo_epi16(vsrc, vzero);
+ __m128i vsrc1 = _mm_unpackhi_epi16(vsrc, vzero);
+ v_acc_sum = _mm_add_epi32(vsrc0, v_acc_sum);
+ v_acc_sum = _mm_add_epi32(vsrc1, v_acc_sum);
+
+ __m128i vsqs0 = _mm_madd_epi16(vsrc, vsrc);
+ v_acc_sqs = _mm_add_epi32(v_acc_sqs, vsqs0);
+ srcp += src_stride;
+ }
+
+ // Update total sum and clear the vectors
+ s += mm_accumulate_epi32(v_acc_sum);
+ ss += mm_accumulate_epi32(v_acc_sqs);
+ v_acc_sum = vzero;
+ v_acc_sqs = vzero;
+ }
+
+ // Process the remaining area using C
+ srcp = srcp1;
+ for (int k = 0; k < height; k++) {
+ for (int m = i; m < width; m++) {
+ uint16_t val = srcp[m];
+ s += val;
+ ss += val * val;
+ }
+ srcp += src_stride;
+ }
+ return (ss - s * s / (width * height));
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-27 21:52:22 +0000