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diff --git a/third_party/aom/aom_dsp/x86/synonyms_avx2.h b/third_party/aom/aom_dsp/x86/synonyms_avx2.h
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+/*
+ * 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.
+ */
+
+#ifndef AOM_AOM_DSP_X86_SYNONYMS_AVX2_H_
+#define AOM_AOM_DSP_X86_SYNONYMS_AVX2_H_
+
+#include <immintrin.h>
+
+#include "config/aom_config.h"
+
+#include "aom/aom_integer.h"
+
+/**
+ * Various reusable shorthands for x86 SIMD intrinsics.
+ *
+ * Intrinsics prefixed with xx_ operate on or return 128bit XMM registers.
+ * Intrinsics prefixed with yy_ operate on or return 256bit YMM registers.
+ */
+
+// Loads and stores to do away with the tedium of casting the address
+// to the right type.
+static INLINE __m256i yy_load_256(const void *a) {
+  return _mm256_load_si256((const __m256i *)a);
+}
+
+static INLINE __m256i yy_loadu_256(const void *a) {
+  return _mm256_loadu_si256((const __m256i *)a);
+}
+
+static INLINE void yy_store_256(void *const a, const __m256i v) {
+  _mm256_store_si256((__m256i *)a, v);
+}
+
+static INLINE void yy_storeu_256(void *const a, const __m256i v) {
+  _mm256_storeu_si256((__m256i *)a, v);
+}
+
+// The _mm256_set1_epi64x() intrinsic is undefined for some Visual Studio
+// compilers. The following function is equivalent to _mm256_set1_epi64x()
+// acting on a 32-bit integer.
+static INLINE __m256i yy_set1_64_from_32i(int32_t a) {
+#if defined(_MSC_VER) && defined(_M_IX86) && _MSC_VER < 1900
+  return _mm256_set_epi32(0, a, 0, a, 0, a, 0, a);
+#else
+  return _mm256_set1_epi64x((uint32_t)a);
+#endif
+}
+
+// Some compilers don't have _mm256_set_m128i defined in immintrin.h. We
+// therefore define an equivalent function using a different intrinsic.
+// ([ hi ], [ lo ]) -> [ hi ][ lo ]
+static INLINE __m256i yy_set_m128i(__m128i hi, __m128i lo) {
+  return _mm256_insertf128_si256(_mm256_castsi128_si256(lo), hi, 1);
+}
+
+static INLINE __m256i yy_loadu2_128(const void *hi, const void *lo) {
+  __m128i mhi = _mm_loadu_si128((__m128i *)(hi));
+  __m128i mlo = _mm_loadu_si128((__m128i *)(lo));
+  return yy_set_m128i(mhi, mlo);
+}
+
+static INLINE __m256i yy_roundn_epu16(__m256i v_val_w, int bits) {
+  const __m256i v_s_w = _mm256_srli_epi16(v_val_w, bits - 1);
+  return _mm256_avg_epu16(v_s_w, _mm256_setzero_si256());
+}
+#endif  // AOM_AOM_DSP_X86_SYNONYMS_AVX2_H_