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diff --git a/src/dsp/arm/intrapred_smooth_neon.h b/src/dsp/arm/intrapred_smooth_neon.h
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+++ b/src/dsp/arm/intrapred_smooth_neon.h
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+/*
+ * Copyright 2021 The libgav1 Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBGAV1_SRC_DSP_ARM_INTRAPRED_SMOOTH_NEON_H_
+#define LIBGAV1_SRC_DSP_ARM_INTRAPRED_SMOOTH_NEON_H_
+
+#include "src/dsp/dsp.h"
+#include "src/utils/cpu.h"
+
+namespace libgav1 {
+namespace dsp {
+
+// Initializes Dsp::intra_predictors[][kIntraPredictorSmooth.*].
+// This function is not thread-safe.
+void IntraPredSmoothInit_NEON();
+
+}  // namespace dsp
+}  // namespace libgav1
+
+#if LIBGAV1_ENABLE_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize4x4_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize4x4_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize4x4_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize4x8_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize4x8_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize4x8_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize4x16_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize4x16_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize4x16_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize8x4_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x4_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x4_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize8x8_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x8_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x8_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize8x16_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x16_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x16_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize8x32_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x32_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize8x32_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize16x4_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x4_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x4_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize16x8_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x8_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x8_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize16x16_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x16_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x16_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize16x32_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x32_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x32_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize16x64_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x64_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize16x64_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize32x8_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x8_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x8_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize32x16_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x16_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x16_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize32x32_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x32_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x32_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize32x64_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x64_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize32x64_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize64x16_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize64x16_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize64x16_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize64x32_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize64x32_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize64x32_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+
+#define LIBGAV1_Dsp8bpp_TransformSize64x64_IntraPredictorSmooth LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize64x64_IntraPredictorSmoothVertical \
+  LIBGAV1_CPU_NEON
+#define LIBGAV1_Dsp8bpp_TransformSize64x64_IntraPredictorSmoothHorizontal \
+  LIBGAV1_CPU_NEON
+#endif  // LIBGAV1_ENABLE_NEON
+
+#endif  // LIBGAV1_SRC_DSP_ARM_INTRAPRED_SMOOTH_NEON_H_