1 files changed, 129 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/x86/variance_impl_ssse3.c b/third_party/aom/aom_dsp/x86/variance_impl_ssse3.c
new file mode 100644
index 000000000..66b0d7d84
--- /dev/null
+++ b/third_party/aom/aom_dsp/x86/variance_impl_ssse3.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2018, 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 <tmmintrin.h>
+
+#include "config/aom_config.h"
+#include "config/aom_dsp_rtcd.h"
+
+#include "aom_dsp/x86/synonyms.h"
+
+void aom_var_filter_block2d_bil_first_pass_ssse3(
+    const uint8_t *a, uint16_t *b, unsigned int src_pixels_per_line,
+    unsigned int pixel_step, unsigned int output_height,
+    unsigned int output_width, const uint8_t *filter) {
+  // Note: filter[0], filter[1] could be {128, 0}, where 128 will overflow
+  // in computation using _mm_maddubs_epi16.
+  // Change {128, 0} to {64, 0} and reduce FILTER_BITS by 1 to avoid overflow.
+  const int16_t round = (1 << (FILTER_BITS - 1)) >> 1;
+  const __m128i r = _mm_set1_epi16(round);
+  const uint8_t f0 = filter[0] >> 1;
+  const uint8_t f1 = filter[1] >> 1;
+  const __m128i filters = _mm_setr_epi8(f0, f1, f0, f1, f0, f1, f0, f1, f0, f1,
+                                        f0, f1, f0, f1, f0, f1);
+  unsigned int i, j;
+  (void)pixel_step;
+
+  if (output_width >= 8) {
+    for (i = 0; i < output_height; ++i) {
+      for (j = 0; j < output_width; j += 8) {
+        // load source
+        __m128i source_low = xx_loadl_64(a);
+        __m128i source_hi = xx_loadl_64(a + 1);
+
+        // unpack to:
+        // { a[0], a[1], a[1], a[2], a[2], a[3], a[3], a[4],
+        //   a[4], a[5], a[5], a[6], a[6], a[7], a[7], a[8] }
+        __m128i source = _mm_unpacklo_epi8(source_low, source_hi);
+
+        // b[i] = a[i] * filter[0] + a[i + 1] * filter[1]
+        __m128i res = _mm_maddubs_epi16(source, filters);
+
+        // round
+        res = _mm_srai_epi16(_mm_add_epi16(res, r), FILTER_BITS - 1);
+
+        xx_storeu_128(b, res);
+
+        a += 8;
+        b += 8;
+      }
+
+      a += src_pixels_per_line - output_width;
+    }
+  } else {
+    const __m128i shuffle_mask =
+        _mm_setr_epi8(0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8);
+    for (i = 0; i < output_height; ++i) {
+      // load source, only first 5 values are meaningful:
+      // { a[0], a[1], a[2], a[3], a[4], xxxx }
+      __m128i source = xx_loadl_64(a);
+
+      // shuffle, up to the first 8 are useful
+      // { a[0], a[1], a[1], a[2], a[2], a[3], a[3], a[4],
+      //   a[4], a[5], a[5], a[6], a[6], a[7], a[7], a[8] }
+      __m128i source_shuffle = _mm_shuffle_epi8(source, shuffle_mask);
+
+      __m128i res = _mm_maddubs_epi16(source_shuffle, filters);
+      res = _mm_srai_epi16(_mm_add_epi16(res, r), FILTER_BITS - 1);
+
+      xx_storel_64(b, res);
+
+      a += src_pixels_per_line;
+      b += output_width;
+    }
+  }
+}
+
+void aom_var_filter_block2d_bil_second_pass_ssse3(
+    const uint16_t *a, uint8_t *b, unsigned int src_pixels_per_line,
+    unsigned int pixel_step, unsigned int output_height,
+    unsigned int output_width, const uint8_t *filter) {
+  const int16_t round = (1 << FILTER_BITS) >> 1;
+  const __m128i r = _mm_set1_epi32(round);
+  const __m128i filters =
+      _mm_setr_epi16(filter[0], filter[1], filter[0], filter[1], filter[0],
+                     filter[1], filter[0], filter[1]);
+  const __m128i shuffle_mask =
+      _mm_setr_epi8(0, 1, 8, 9, 2, 3, 10, 11, 4, 5, 12, 13, 6, 7, 14, 15);
+  const __m128i mask =
+      _mm_setr_epi8(0, 4, 8, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1);
+  unsigned int i, j;
+
+  for (i = 0; i < output_height; ++i) {
+    for (j = 0; j < output_width; j += 4) {
+      // load source as:
+      // { a[0], a[1], a[2], a[3], a[w], a[w+1], a[w+2], a[w+3] }
+      __m128i source1 = xx_loadl_64(a);
+      __m128i source2 = xx_loadl_64(a + pixel_step);
+      __m128i source = _mm_unpacklo_epi64(source1, source2);
+
+      // shuffle source to:
+      // { a[0], a[w], a[1], a[w+1], a[2], a[w+2], a[3], a[w+3] }
+      __m128i source_shuffle = _mm_shuffle_epi8(source, shuffle_mask);
+
+      // b[i] = a[i] * filter[0] + a[w + i] * filter[1]
+      __m128i res = _mm_madd_epi16(source_shuffle, filters);
+
+      // round
+      res = _mm_srai_epi32(_mm_add_epi32(res, r), FILTER_BITS);
+
+      // shuffle to get each lower 8 bit of every 32 bit
+      res = _mm_shuffle_epi8(res, mask);
+
+      xx_storel_32(b, res);
+
+      a += 4;
+      b += 4;
+    }
+
+    a += src_pixels_per_line - output_width;
+  }
+}