1 files changed, 50 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/x86/convolve_ssse3.h b/third_party/aom/aom_dsp/x86/convolve_ssse3.h
new file mode 100644
index 0000000000..b1abead146
--- /dev/null
+++ b/third_party/aom/aom_dsp/x86/convolve_ssse3.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2021, 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.
+ */
+
+#ifndef AOM_AOM_DSP_X86_CONVOLVE_SSSE3_H_
+#define AOM_AOM_DSP_X86_CONVOLVE_SSSE3_H_
+
+#include <tmmintrin.h>  // SSSE3
+
+static INLINE void shuffle_filter_ssse3(const int16_t *const filter,
+                                        __m128i *const f) {
+  const __m128i f_values = _mm_load_si128((const __m128i *)filter);
+  // pack and duplicate the filter values
+  f[0] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0200u));
+  f[1] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0604u));
+  f[2] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0a08u));
+  f[3] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0e0cu));
+}
+
+static INLINE __m128i convolve8_8_ssse3(const __m128i *const s,
+                                        const __m128i *const f) {
+  // multiply 2 adjacent elements with the filter and add the result
+  const __m128i k_64 = _mm_set1_epi16(1 << 6);
+  const __m128i x0 = _mm_maddubs_epi16(s[0], f[0]);
+  const __m128i x1 = _mm_maddubs_epi16(s[1], f[1]);
+  const __m128i x2 = _mm_maddubs_epi16(s[2], f[2]);
+  const __m128i x3 = _mm_maddubs_epi16(s[3], f[3]);
+  __m128i sum1, sum2;
+
+  // sum the results together, saturating only on the final step
+  // adding x0 with x2 and x1 with x3 is the only order that prevents
+  // outranges for all filters
+  sum1 = _mm_add_epi16(x0, x2);
+  sum2 = _mm_add_epi16(x1, x3);
+  // add the rounding offset early to avoid another saturated add
+  sum1 = _mm_add_epi16(sum1, k_64);
+  sum1 = _mm_adds_epi16(sum1, sum2);
+  // shift by 7 bit each 16 bit
+  sum1 = _mm_srai_epi16(sum1, 7);
+  return sum1;
+}
+
+#endif  // AOM_AOM_DSP_X86_CONVOLVE_SSSE3_H_