1 files changed, 59 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/x86/avg_intrin_sse4.c b/third_party/aom/aom_dsp/x86/avg_intrin_sse4.c
new file mode 100644
index 0000000000..b83b43122a
--- /dev/null
+++ b/third_party/aom/aom_dsp/x86/avg_intrin_sse4.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2022, 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 <smmintrin.h>
+
+#include "config/aom_dsp_rtcd.h"
+
+// ref: [0 - 510]
+// src: [0 - 510]
+// bwl: {2, 3, 4, 5}
+int aom_vector_var_sse4_1(const int16_t *ref, const int16_t *src, int bwl) {
+  const int width = 4 << bwl;
+  assert(width % 16 == 0);
+
+  const __m128i k_one_epi16 = _mm_set1_epi16((int16_t)1);
+  __m128i mean = _mm_setzero_si128();
+  __m128i sse = _mm_setzero_si128();
+
+  for (int i = 0; i < width; i += 16) {
+    const __m128i src_line = _mm_loadu_si128((const __m128i *)src);
+    const __m128i ref_line = _mm_loadu_si128((const __m128i *)ref);
+    const __m128i src_line2 = _mm_loadu_si128((const __m128i *)(src + 8));
+    const __m128i ref_line2 = _mm_loadu_si128((const __m128i *)(ref + 8));
+    __m128i diff = _mm_sub_epi16(ref_line, src_line);
+    const __m128i diff2 = _mm_sub_epi16(ref_line2, src_line2);
+    __m128i diff_sqr = _mm_madd_epi16(diff, diff);
+    const __m128i diff_sqr2 = _mm_madd_epi16(diff2, diff2);
+
+    diff = _mm_add_epi16(diff, diff2);
+    diff_sqr = _mm_add_epi32(diff_sqr, diff_sqr2);
+    sse = _mm_add_epi32(sse, diff_sqr);
+    mean = _mm_add_epi16(mean, diff);
+
+    src += 16;
+    ref += 16;
+  }
+
+  // m0 m1 m2 m3
+  mean = _mm_madd_epi16(mean, k_one_epi16);
+  // m0+m1 m2+m3 s0+s1 s2+s3
+  __m128i result = _mm_hadd_epi32(mean, sse);
+  // m0+m1+m2+m3 s0+s1+s2+s3 x x
+  result = _mm_add_epi32(result, _mm_bsrli_si128(result, 4));
+
+  // (mean * mean): dynamic range 31 bits.
+  const int mean_int = _mm_extract_epi32(result, 0);
+  const int sse_int = _mm_extract_epi32(result, 2);
+  const unsigned int mean_abs = abs(mean_int);
+  const int var = sse_int - ((mean_abs * mean_abs) >> (bwl + 2));
+  return var;
+}