1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/arm/neon/shift_neon.h b/third_party/aom/av1/encoder/arm/neon/shift_neon.h
new file mode 100644
index 0000000000..d73aef2f25
--- /dev/null
+++ b/third_party/aom/av1/encoder/arm/neon/shift_neon.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2023, 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_AV1_ENCODER_ARM_NEON_SHIFT_NEON_H_
+#define AOM_AV1_ENCODER_ARM_NEON_SHIFT_NEON_H_
+
+#include <arm_neon.h>
+
+#include "aom/aom_integer.h"  // For AOM_INLINE.
+
+#define SHIFT_LOOP_HELPER(name, type, intrinsic, arg)                \
+  static AOM_INLINE void name(const type *in, type *out, int size) { \
+    int i = 0;                                                       \
+    do {                                                             \
+      out[i] = intrinsic(in[i], arg);                                \
+    } while (++i < size);                                            \
+  }
+
+SHIFT_LOOP_HELPER(shift_left_2_s16_x4, int16x4_t, vshl_n_s16, 2)
+SHIFT_LOOP_HELPER(shift_left_2_s16_x8, int16x8_t, vshlq_n_s16, 2)
+SHIFT_LOOP_HELPER(shift_left_2_s32_x4, int32x4_t, vshlq_n_s32, 2)
+SHIFT_LOOP_HELPER(shift_right_2_round_s16_x8, int16x8_t, vrshrq_n_s16, 2)
+SHIFT_LOOP_HELPER(shift_right_2_round_s32_x4, int32x4_t, vrshrq_n_s32, 2)
+SHIFT_LOOP_HELPER(shift_right_4_round_s16_x8, int16x8_t, vrshrq_n_s16, 4)
+SHIFT_LOOP_HELPER(shift_right_4_round_s32_x4, int32x4_t, vrshrq_n_s32, 4)
+
+// Addition instructions have slightly better performance compared to shift
+// instructions on some micro-architectures, so use these for shifts by one.
+
+SHIFT_LOOP_HELPER(shift_left_1_s16_x4, int16x4_t, vadd_s16, in[i])
+SHIFT_LOOP_HELPER(shift_left_1_s16_x8, int16x8_t, vaddq_s16, in[i])
+SHIFT_LOOP_HELPER(shift_right_1_round_s16_x4, int16x4_t, vrhadd_s16,
+                  vdup_n_s16(0))
+SHIFT_LOOP_HELPER(shift_right_1_round_s16_x8, int16x8_t, vrhaddq_s16,
+                  vdupq_n_s16(0))
+SHIFT_LOOP_HELPER(shift_right_1_round_s32_x4, int32x4_t, vrhaddq_s32,
+                  vdupq_n_s32(0))
+
+#undef SHIFT_LOOP_HELPER
+
+#endif  // AOM_AV1_ENCODER_ARM_NEON_SHIFT_NEON_H_