Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

2 files changed, 820 insertions, 0 deletions

diff --git a/third_party/aom/av1/common/arm/neon/iht4x4_add_neon.c b/third_party/aom/av1/common/arm/neon/iht4x4_add_neon.c
new file mode 100644
index 000000000..02572d405
--- /dev/null
+++ b/third_party/aom/av1/common/arm/neon/iht4x4_add_neon.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2016, 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 <arm_neon.h>
+#include <assert.h>
+
+#include "./aom_config.h"
+#include "./av1_rtcd.h"
+#include "aom_dsp/txfm_common.h"
+#include "av1/common/common.h"
+
+static INLINE void TRANSPOSE4X4(int16x8_t *q8s16, int16x8_t *q9s16) {
+  int32x4_t q8s32, q9s32;
+  int16x4x2_t d0x2s16, d1x2s16;
+  int32x4x2_t q0x2s32;
+
+  d0x2s16 = vtrn_s16(vget_low_s16(*q8s16), vget_high_s16(*q8s16));
+  d1x2s16 = vtrn_s16(vget_low_s16(*q9s16), vget_high_s16(*q9s16));
+
+  q8s32 = vreinterpretq_s32_s16(vcombine_s16(d0x2s16.val[0], d0x2s16.val[1]));
+  q9s32 = vreinterpretq_s32_s16(vcombine_s16(d1x2s16.val[0], d1x2s16.val[1]));
+  q0x2s32 = vtrnq_s32(q8s32, q9s32);
+
+  *q8s16 = vreinterpretq_s16_s32(q0x2s32.val[0]);
+  *q9s16 = vreinterpretq_s16_s32(q0x2s32.val[1]);
+  return;
+}
+
+static INLINE void GENERATE_COSINE_CONSTANTS(int16x4_t *d0s16, int16x4_t *d1s16,
+                                             int16x4_t *d2s16) {
+  *d0s16 = vdup_n_s16((int16_t)cospi_8_64);
+  *d1s16 = vdup_n_s16((int16_t)cospi_16_64);
+  *d2s16 = vdup_n_s16((int16_t)cospi_24_64);
+  return;
+}
+
+static INLINE void GENERATE_SINE_CONSTANTS(int16x4_t *d3s16, int16x4_t *d4s16,
+                                           int16x4_t *d5s16, int16x8_t *q3s16) {
+  *d3s16 = vdup_n_s16((int16_t)sinpi_1_9);
+  *d4s16 = vdup_n_s16((int16_t)sinpi_2_9);
+  *q3s16 = vdupq_n_s16((int16_t)sinpi_3_9);
+  *d5s16 = vdup_n_s16((int16_t)sinpi_4_9);
+  return;
+}
+
+static INLINE void IDCT4x4_1D(int16x4_t *d0s16, int16x4_t *d1s16,
+                              int16x4_t *d2s16, int16x8_t *q8s16,
+                              int16x8_t *q9s16) {
+  int16x4_t d16s16, d17s16, d18s16, d19s16, d23s16, d24s16;
+  int16x4_t d26s16, d27s16, d28s16, d29s16;
+  int32x4_t q10s32, q13s32, q14s32, q15s32;
+  int16x8_t q13s16, q14s16;
+
+  d16s16 = vget_low_s16(*q8s16);
+  d17s16 = vget_high_s16(*q8s16);
+  d18s16 = vget_low_s16(*q9s16);
+  d19s16 = vget_high_s16(*q9s16);
+
+  d23s16 = vadd_s16(d16s16, d18s16);
+  d24s16 = vsub_s16(d16s16, d18s16);
+
+  q15s32 = vmull_s16(d17s16, *d2s16);
+  q10s32 = vmull_s16(d17s16, *d0s16);
+  q13s32 = vmull_s16(d23s16, *d1s16);
+  q14s32 = vmull_s16(d24s16, *d1s16);
+  q15s32 = vmlsl_s16(q15s32, d19s16, *d0s16);
+  q10s32 = vmlal_s16(q10s32, d19s16, *d2s16);
+
+  d26s16 = vqrshrn_n_s32(q13s32, 14);
+  d27s16 = vqrshrn_n_s32(q14s32, 14);
+  d29s16 = vqrshrn_n_s32(q15s32, 14);
+  d28s16 = vqrshrn_n_s32(q10s32, 14);
+
+  q13s16 = vcombine_s16(d26s16, d27s16);
+  q14s16 = vcombine_s16(d28s16, d29s16);
+  *q8s16 = vaddq_s16(q13s16, q14s16);
+  *q9s16 = vsubq_s16(q13s16, q14s16);
+  *q9s16 = vcombine_s16(vget_high_s16(*q9s16), vget_low_s16(*q9s16));  // vswp
+  return;
+}
+
+static INLINE void IADST4x4_1D(int16x4_t *d3s16, int16x4_t *d4s16,
+                               int16x4_t *d5s16, int16x8_t *q3s16,
+                               int16x8_t *q8s16, int16x8_t *q9s16) {
+  int16x4_t d6s16, d16s16, d17s16, d18s16, d19s16;
+  int32x4_t q8s32, q9s32, q10s32, q11s32, q12s32, q13s32, q14s32, q15s32;
+
+  d6s16 = vget_low_s16(*q3s16);
+
+  d16s16 = vget_low_s16(*q8s16);
+  d17s16 = vget_high_s16(*q8s16);
+  d18s16 = vget_low_s16(*q9s16);
+  d19s16 = vget_high_s16(*q9s16);
+
+  q10s32 = vmull_s16(*d3s16, d16s16);
+  q11s32 = vmull_s16(*d4s16, d16s16);
+  q12s32 = vmull_s16(d6s16, d17s16);
+  q13s32 = vmull_s16(*d5s16, d18s16);
+  q14s32 = vmull_s16(*d3s16, d18s16);
+  q15s32 = vmovl_s16(d16s16);
+  q15s32 = vaddw_s16(q15s32, d19s16);
+  q8s32 = vmull_s16(*d4s16, d19s16);
+  q15s32 = vsubw_s16(q15s32, d18s16);
+  q9s32 = vmull_s16(*d5s16, d19s16);
+
+  q10s32 = vaddq_s32(q10s32, q13s32);
+  q10s32 = vaddq_s32(q10s32, q8s32);
+  q11s32 = vsubq_s32(q11s32, q14s32);
+  q8s32 = vdupq_n_s32((int32_t)sinpi_3_9);
+  q11s32 = vsubq_s32(q11s32, q9s32);
+  q15s32 = vmulq_s32(q15s32, q8s32);
+
+  q13s32 = vaddq_s32(q10s32, q12s32);
+  q10s32 = vaddq_s32(q10s32, q11s32);
+  q14s32 = vaddq_s32(q11s32, q12s32);
+  q10s32 = vsubq_s32(q10s32, q12s32);
+
+  d16s16 = vqrshrn_n_s32(q13s32, 14);
+  d17s16 = vqrshrn_n_s32(q14s32, 14);
+  d18s16 = vqrshrn_n_s32(q15s32, 14);
+  d19s16 = vqrshrn_n_s32(q10s32, 14);
+
+  *q8s16 = vcombine_s16(d16s16, d17s16);
+  *q9s16 = vcombine_s16(d18s16, d19s16);
+  return;
+}
+
+void av1_iht4x4_16_add_neon(const tran_low_t *input, uint8_t *dest,
+                            int dest_stride, int tx_type) {
+  uint8x8_t d26u8, d27u8;
+  int16x4_t d0s16, d1s16, d2s16, d3s16, d4s16, d5s16;
+  uint32x2_t d26u32, d27u32;
+  int16x8_t q3s16, q8s16, q9s16;
+  uint16x8_t q8u16, q9u16;
+
+  d26u32 = d27u32 = vdup_n_u32(0);
+
+  q8s16 = vld1q_s16(input);
+  q9s16 = vld1q_s16(input + 8);
+
+  TRANSPOSE4X4(&q8s16, &q9s16);
+
+  switch (tx_type) {
+    case 0:  // idct_idct is not supported. Fall back to C
+      av1_iht4x4_16_add_c(input, dest, dest_stride, tx_type);
+      return;
+      break;
+    case 1:  // iadst_idct
+      // generate constants
+      GENERATE_COSINE_CONSTANTS(&d0s16, &d1s16, &d2s16);
+      GENERATE_SINE_CONSTANTS(&d3s16, &d4s16, &d5s16, &q3s16);
+
+      // first transform rows
+      IDCT4x4_1D(&d0s16, &d1s16, &d2s16, &q8s16, &q9s16);
+
+      // transpose the matrix
+      TRANSPOSE4X4(&q8s16, &q9s16);
+
+      // then transform columns
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+      break;
+    case 2:  // idct_iadst
+      // generate constantsyy
+      GENERATE_COSINE_CONSTANTS(&d0s16, &d1s16, &d2s16);
+      GENERATE_SINE_CONSTANTS(&d3s16, &d4s16, &d5s16, &q3s16);
+
+      // first transform rows
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+
+      // transpose the matrix
+      TRANSPOSE4X4(&q8s16, &q9s16);
+
+      // then transform columns
+      IDCT4x4_1D(&d0s16, &d1s16, &d2s16, &q8s16, &q9s16);
+      break;
+    case 3:  // iadst_iadst
+      // generate constants
+      GENERATE_SINE_CONSTANTS(&d3s16, &d4s16, &d5s16, &q3s16);
+
+      // first transform rows
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+
+      // transpose the matrix
+      TRANSPOSE4X4(&q8s16, &q9s16);
+
+      // then transform columns
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+      break;
+    default:  // iadst_idct
+      assert(0);
+      break;
+  }
+
+  q8s16 = vrshrq_n_s16(q8s16, 4);
+  q9s16 = vrshrq_n_s16(q9s16, 4);
+
+  d26u32 = vld1_lane_u32((const uint32_t *)dest, d26u32, 0);
+  dest += dest_stride;
+  d26u32 = vld1_lane_u32((const uint32_t *)dest, d26u32, 1);
+  dest += dest_stride;
+  d27u32 = vld1_lane_u32((const uint32_t *)dest, d27u32, 0);
+  dest += dest_stride;
+  d27u32 = vld1_lane_u32((const uint32_t *)dest, d27u32, 1);
+
+  q8u16 = vaddw_u8(vreinterpretq_u16_s16(q8s16), vreinterpret_u8_u32(d26u32));
+  q9u16 = vaddw_u8(vreinterpretq_u16_s16(q9s16), vreinterpret_u8_u32(d27u32));
+
+  d26u8 = vqmovun_s16(vreinterpretq_s16_u16(q8u16));
+  d27u8 = vqmovun_s16(vreinterpretq_s16_u16(q9u16));
+
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d27u8), 1);
+  dest -= dest_stride;
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d27u8), 0);
+  dest -= dest_stride;
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d26u8), 1);
+  dest -= dest_stride;
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d26u8), 0);
+  return;
+}
diff --git a/third_party/aom/av1/common/arm/neon/iht8x8_add_neon.c b/third_party/aom/av1/common/arm/neon/iht8x8_add_neon.c
new file mode 100644
index 000000000..86798ccf1
--- /dev/null
+++ b/third_party/aom/av1/common/arm/neon/iht8x8_add_neon.c
@@ -0,0 +1,593 @@
+/*
+ * Copyright (c) 2016, 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 <arm_neon.h>
+#include <assert.h>
+
+#include "./aom_config.h"
+#include "./av1_rtcd.h"
+#include "aom_dsp/txfm_common.h"
+#include "av1/common/common.h"
+
+static INLINE void TRANSPOSE8X8(int16x8_t *q8s16, int16x8_t *q9s16,
+                                int16x8_t *q10s16, int16x8_t *q11s16,
+                                int16x8_t *q12s16, int16x8_t *q13s16,
+                                int16x8_t *q14s16, int16x8_t *q15s16) {
+  int16x4_t d16s16, d17s16, d18s16, d19s16, d20s16, d21s16, d22s16, d23s16;
+  int16x4_t d24s16, d25s16, d26s16, d27s16, d28s16, d29s16, d30s16, d31s16;
+  int32x4x2_t q0x2s32, q1x2s32, q2x2s32, q3x2s32;
+  int16x8x2_t q0x2s16, q1x2s16, q2x2s16, q3x2s16;
+
+  d16s16 = vget_low_s16(*q8s16);
+  d17s16 = vget_high_s16(*q8s16);
+  d18s16 = vget_low_s16(*q9s16);
+  d19s16 = vget_high_s16(*q9s16);
+  d20s16 = vget_low_s16(*q10s16);
+  d21s16 = vget_high_s16(*q10s16);
+  d22s16 = vget_low_s16(*q11s16);
+  d23s16 = vget_high_s16(*q11s16);
+  d24s16 = vget_low_s16(*q12s16);
+  d25s16 = vget_high_s16(*q12s16);
+  d26s16 = vget_low_s16(*q13s16);
+  d27s16 = vget_high_s16(*q13s16);
+  d28s16 = vget_low_s16(*q14s16);
+  d29s16 = vget_high_s16(*q14s16);
+  d30s16 = vget_low_s16(*q15s16);
+  d31s16 = vget_high_s16(*q15s16);
+
+  *q8s16 = vcombine_s16(d16s16, d24s16);   // vswp d17, d24
+  *q9s16 = vcombine_s16(d18s16, d26s16);   // vswp d19, d26
+  *q10s16 = vcombine_s16(d20s16, d28s16);  // vswp d21, d28
+  *q11s16 = vcombine_s16(d22s16, d30s16);  // vswp d23, d30
+  *q12s16 = vcombine_s16(d17s16, d25s16);
+  *q13s16 = vcombine_s16(d19s16, d27s16);
+  *q14s16 = vcombine_s16(d21s16, d29s16);
+  *q15s16 = vcombine_s16(d23s16, d31s16);
+
+  q0x2s32 =
+      vtrnq_s32(vreinterpretq_s32_s16(*q8s16), vreinterpretq_s32_s16(*q10s16));
+  q1x2s32 =
+      vtrnq_s32(vreinterpretq_s32_s16(*q9s16), vreinterpretq_s32_s16(*q11s16));
+  q2x2s32 =
+      vtrnq_s32(vreinterpretq_s32_s16(*q12s16), vreinterpretq_s32_s16(*q14s16));
+  q3x2s32 =
+      vtrnq_s32(vreinterpretq_s32_s16(*q13s16), vreinterpretq_s32_s16(*q15s16));
+
+  q0x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q0x2s32.val[0]),   // q8
+                      vreinterpretq_s16_s32(q1x2s32.val[0]));  // q9
+  q1x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q0x2s32.val[1]),   // q10
+                      vreinterpretq_s16_s32(q1x2s32.val[1]));  // q11
+  q2x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q2x2s32.val[0]),   // q12
+                      vreinterpretq_s16_s32(q3x2s32.val[0]));  // q13
+  q3x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q2x2s32.val[1]),   // q14
+                      vreinterpretq_s16_s32(q3x2s32.val[1]));  // q15
+
+  *q8s16 = q0x2s16.val[0];
+  *q9s16 = q0x2s16.val[1];
+  *q10s16 = q1x2s16.val[0];
+  *q11s16 = q1x2s16.val[1];
+  *q12s16 = q2x2s16.val[0];
+  *q13s16 = q2x2s16.val[1];
+  *q14s16 = q3x2s16.val[0];
+  *q15s16 = q3x2s16.val[1];
+  return;
+}
+
+static INLINE void IDCT8x8_1D(int16x8_t *q8s16, int16x8_t *q9s16,
+                              int16x8_t *q10s16, int16x8_t *q11s16,
+                              int16x8_t *q12s16, int16x8_t *q13s16,
+                              int16x8_t *q14s16, int16x8_t *q15s16) {
+  int16x4_t d0s16, d1s16, d2s16, d3s16;
+  int16x4_t d8s16, d9s16, d10s16, d11s16, d12s16, d13s16, d14s16, d15s16;
+  int16x4_t d16s16, d17s16, d18s16, d19s16, d20s16, d21s16, d22s16, d23s16;
+  int16x4_t d24s16, d25s16, d26s16, d27s16, d28s16, d29s16, d30s16, d31s16;
+  int16x8_t q0s16, q1s16, q2s16, q3s16, q4s16, q5s16, q6s16, q7s16;
+  int32x4_t q2s32, q3s32, q5s32, q6s32, q8s32, q9s32;
+  int32x4_t q10s32, q11s32, q12s32, q13s32, q15s32;
+
+  d0s16 = vdup_n_s16((int16_t)cospi_28_64);
+  d1s16 = vdup_n_s16((int16_t)cospi_4_64);
+  d2s16 = vdup_n_s16((int16_t)cospi_12_64);
+  d3s16 = vdup_n_s16((int16_t)cospi_20_64);
+
+  d16s16 = vget_low_s16(*q8s16);
+  d17s16 = vget_high_s16(*q8s16);
+  d18s16 = vget_low_s16(*q9s16);
+  d19s16 = vget_high_s16(*q9s16);
+  d20s16 = vget_low_s16(*q10s16);
+  d21s16 = vget_high_s16(*q10s16);
+  d22s16 = vget_low_s16(*q11s16);
+  d23s16 = vget_high_s16(*q11s16);
+  d24s16 = vget_low_s16(*q12s16);
+  d25s16 = vget_high_s16(*q12s16);
+  d26s16 = vget_low_s16(*q13s16);
+  d27s16 = vget_high_s16(*q13s16);
+  d28s16 = vget_low_s16(*q14s16);
+  d29s16 = vget_high_s16(*q14s16);
+  d30s16 = vget_low_s16(*q15s16);
+  d31s16 = vget_high_s16(*q15s16);
+
+  q2s32 = vmull_s16(d18s16, d0s16);
+  q3s32 = vmull_s16(d19s16, d0s16);
+  q5s32 = vmull_s16(d26s16, d2s16);
+  q6s32 = vmull_s16(d27s16, d2s16);
+
+  q2s32 = vmlsl_s16(q2s32, d30s16, d1s16);
+  q3s32 = vmlsl_s16(q3s32, d31s16, d1s16);
+  q5s32 = vmlsl_s16(q5s32, d22s16, d3s16);
+  q6s32 = vmlsl_s16(q6s32, d23s16, d3s16);
+
+  d8s16 = vqrshrn_n_s32(q2s32, 14);
+  d9s16 = vqrshrn_n_s32(q3s32, 14);
+  d10s16 = vqrshrn_n_s32(q5s32, 14);
+  d11s16 = vqrshrn_n_s32(q6s32, 14);
+  q4s16 = vcombine_s16(d8s16, d9s16);
+  q5s16 = vcombine_s16(d10s16, d11s16);
+
+  q2s32 = vmull_s16(d18s16, d1s16);
+  q3s32 = vmull_s16(d19s16, d1s16);
+  q9s32 = vmull_s16(d26s16, d3s16);
+  q13s32 = vmull_s16(d27s16, d3s16);
+
+  q2s32 = vmlal_s16(q2s32, d30s16, d0s16);
+  q3s32 = vmlal_s16(q3s32, d31s16, d0s16);
+  q9s32 = vmlal_s16(q9s32, d22s16, d2s16);
+  q13s32 = vmlal_s16(q13s32, d23s16, d2s16);
+
+  d14s16 = vqrshrn_n_s32(q2s32, 14);
+  d15s16 = vqrshrn_n_s32(q3s32, 14);
+  d12s16 = vqrshrn_n_s32(q9s32, 14);
+  d13s16 = vqrshrn_n_s32(q13s32, 14);
+  q6s16 = vcombine_s16(d12s16, d13s16);
+  q7s16 = vcombine_s16(d14s16, d15s16);
+
+  d0s16 = vdup_n_s16((int16_t)cospi_16_64);
+
+  q2s32 = vmull_s16(d16s16, d0s16);
+  q3s32 = vmull_s16(d17s16, d0s16);
+  q13s32 = vmull_s16(d16s16, d0s16);
+  q15s32 = vmull_s16(d17s16, d0s16);
+
+  q2s32 = vmlal_s16(q2s32, d24s16, d0s16);
+  q3s32 = vmlal_s16(q3s32, d25s16, d0s16);
+  q13s32 = vmlsl_s16(q13s32, d24s16, d0s16);
+  q15s32 = vmlsl_s16(q15s32, d25s16, d0s16);
+
+  d0s16 = vdup_n_s16((int16_t)cospi_24_64);
+  d1s16 = vdup_n_s16((int16_t)cospi_8_64);
+
+  d18s16 = vqrshrn_n_s32(q2s32, 14);
+  d19s16 = vqrshrn_n_s32(q3s32, 14);
+  d22s16 = vqrshrn_n_s32(q13s32, 14);
+  d23s16 = vqrshrn_n_s32(q15s32, 14);
+  *q9s16 = vcombine_s16(d18s16, d19s16);
+  *q11s16 = vcombine_s16(d22s16, d23s16);
+
+  q2s32 = vmull_s16(d20s16, d0s16);
+  q3s32 = vmull_s16(d21s16, d0s16);
+  q8s32 = vmull_s16(d20s16, d1s16);
+  q12s32 = vmull_s16(d21s16, d1s16);
+
+  q2s32 = vmlsl_s16(q2s32, d28s16, d1s16);
+  q3s32 = vmlsl_s16(q3s32, d29s16, d1s16);
+  q8s32 = vmlal_s16(q8s32, d28s16, d0s16);
+  q12s32 = vmlal_s16(q12s32, d29s16, d0s16);
+
+  d26s16 = vqrshrn_n_s32(q2s32, 14);
+  d27s16 = vqrshrn_n_s32(q3s32, 14);
+  d30s16 = vqrshrn_n_s32(q8s32, 14);
+  d31s16 = vqrshrn_n_s32(q12s32, 14);
+  *q13s16 = vcombine_s16(d26s16, d27s16);
+  *q15s16 = vcombine_s16(d30s16, d31s16);
+
+  q0s16 = vaddq_s16(*q9s16, *q15s16);
+  q1s16 = vaddq_s16(*q11s16, *q13s16);
+  q2s16 = vsubq_s16(*q11s16, *q13s16);
+  q3s16 = vsubq_s16(*q9s16, *q15s16);
+
+  *q13s16 = vsubq_s16(q4s16, q5s16);
+  q4s16 = vaddq_s16(q4s16, q5s16);
+  *q14s16 = vsubq_s16(q7s16, q6s16);
+  q7s16 = vaddq_s16(q7s16, q6s16);
+  d26s16 = vget_low_s16(*q13s16);
+  d27s16 = vget_high_s16(*q13s16);
+  d28s16 = vget_low_s16(*q14s16);
+  d29s16 = vget_high_s16(*q14s16);
+
+  d16s16 = vdup_n_s16((int16_t)cospi_16_64);
+
+  q9s32 = vmull_s16(d28s16, d16s16);
+  q10s32 = vmull_s16(d29s16, d16s16);
+  q11s32 = vmull_s16(d28s16, d16s16);
+  q12s32 = vmull_s16(d29s16, d16s16);
+
+  q9s32 = vmlsl_s16(q9s32, d26s16, d16s16);
+  q10s32 = vmlsl_s16(q10s32, d27s16, d16s16);
+  q11s32 = vmlal_s16(q11s32, d26s16, d16s16);
+  q12s32 = vmlal_s16(q12s32, d27s16, d16s16);
+
+  d10s16 = vqrshrn_n_s32(q9s32, 14);
+  d11s16 = vqrshrn_n_s32(q10s32, 14);
+  d12s16 = vqrshrn_n_s32(q11s32, 14);
+  d13s16 = vqrshrn_n_s32(q12s32, 14);
+  q5s16 = vcombine_s16(d10s16, d11s16);
+  q6s16 = vcombine_s16(d12s16, d13s16);
+
+  *q8s16 = vaddq_s16(q0s16, q7s16);
+  *q9s16 = vaddq_s16(q1s16, q6s16);
+  *q10s16 = vaddq_s16(q2s16, q5s16);
+  *q11s16 = vaddq_s16(q3s16, q4s16);
+  *q12s16 = vsubq_s16(q3s16, q4s16);
+  *q13s16 = vsubq_s16(q2s16, q5s16);
+  *q14s16 = vsubq_s16(q1s16, q6s16);
+  *q15s16 = vsubq_s16(q0s16, q7s16);
+  return;
+}
+
+static INLINE void IADST8X8_1D(int16x8_t *q8s16, int16x8_t *q9s16,
+                               int16x8_t *q10s16, int16x8_t *q11s16,
+                               int16x8_t *q12s16, int16x8_t *q13s16,
+                               int16x8_t *q14s16, int16x8_t *q15s16) {
+  int16x4_t d0s16, d1s16, d2s16, d3s16, d4s16, d5s16, d6s16, d7s16;
+  int16x4_t d8s16, d9s16, d10s16, d11s16, d12s16, d13s16, d14s16, d15s16;
+  int16x4_t d16s16, d17s16, d18s16, d19s16, d20s16, d21s16, d22s16, d23s16;
+  int16x4_t d24s16, d25s16, d26s16, d27s16, d28s16, d29s16, d30s16, d31s16;
+  int16x8_t q2s16, q4s16, q5s16, q6s16;
+  int32x4_t q0s32, q1s32, q2s32, q3s32, q4s32, q5s32, q6s32, q7s32, q8s32;
+  int32x4_t q9s32, q10s32, q11s32, q12s32, q13s32, q14s32, q15s32;
+
+  d16s16 = vget_low_s16(*q8s16);
+  d17s16 = vget_high_s16(*q8s16);
+  d18s16 = vget_low_s16(*q9s16);
+  d19s16 = vget_high_s16(*q9s16);
+  d20s16 = vget_low_s16(*q10s16);
+  d21s16 = vget_high_s16(*q10s16);
+  d22s16 = vget_low_s16(*q11s16);
+  d23s16 = vget_high_s16(*q11s16);
+  d24s16 = vget_low_s16(*q12s16);
+  d25s16 = vget_high_s16(*q12s16);
+  d26s16 = vget_low_s16(*q13s16);
+  d27s16 = vget_high_s16(*q13s16);
+  d28s16 = vget_low_s16(*q14s16);
+  d29s16 = vget_high_s16(*q14s16);
+  d30s16 = vget_low_s16(*q15s16);
+  d31s16 = vget_high_s16(*q15s16);
+
+  d14s16 = vdup_n_s16((int16_t)cospi_2_64);
+  d15s16 = vdup_n_s16((int16_t)cospi_30_64);
+
+  q1s32 = vmull_s16(d30s16, d14s16);
+  q2s32 = vmull_s16(d31s16, d14s16);
+  q3s32 = vmull_s16(d30s16, d15s16);
+  q4s32 = vmull_s16(d31s16, d15s16);
+
+  d30s16 = vdup_n_s16((int16_t)cospi_18_64);
+  d31s16 = vdup_n_s16((int16_t)cospi_14_64);
+
+  q1s32 = vmlal_s16(q1s32, d16s16, d15s16);
+  q2s32 = vmlal_s16(q2s32, d17s16, d15s16);
+  q3s32 = vmlsl_s16(q3s32, d16s16, d14s16);
+  q4s32 = vmlsl_s16(q4s32, d17s16, d14s16);
+
+  q5s32 = vmull_s16(d22s16, d30s16);
+  q6s32 = vmull_s16(d23s16, d30s16);
+  q7s32 = vmull_s16(d22s16, d31s16);
+  q8s32 = vmull_s16(d23s16, d31s16);
+
+  q5s32 = vmlal_s16(q5s32, d24s16, d31s16);
+  q6s32 = vmlal_s16(q6s32, d25s16, d31s16);
+  q7s32 = vmlsl_s16(q7s32, d24s16, d30s16);
+  q8s32 = vmlsl_s16(q8s32, d25s16, d30s16);
+
+  q11s32 = vaddq_s32(q1s32, q5s32);
+  q12s32 = vaddq_s32(q2s32, q6s32);
+  q1s32 = vsubq_s32(q1s32, q5s32);
+  q2s32 = vsubq_s32(q2s32, q6s32);
+
+  d22s16 = vqrshrn_n_s32(q11s32, 14);
+  d23s16 = vqrshrn_n_s32(q12s32, 14);
+  *q11s16 = vcombine_s16(d22s16, d23s16);
+
+  q12s32 = vaddq_s32(q3s32, q7s32);
+  q15s32 = vaddq_s32(q4s32, q8s32);
+  q3s32 = vsubq_s32(q3s32, q7s32);
+  q4s32 = vsubq_s32(q4s32, q8s32);
+
+  d2s16 = vqrshrn_n_s32(q1s32, 14);
+  d3s16 = vqrshrn_n_s32(q2s32, 14);
+  d24s16 = vqrshrn_n_s32(q12s32, 14);
+  d25s16 = vqrshrn_n_s32(q15s32, 14);
+  d6s16 = vqrshrn_n_s32(q3s32, 14);
+  d7s16 = vqrshrn_n_s32(q4s32, 14);
+  *q12s16 = vcombine_s16(d24s16, d25s16);
+
+  d0s16 = vdup_n_s16((int16_t)cospi_10_64);
+  d1s16 = vdup_n_s16((int16_t)cospi_22_64);
+  q4s32 = vmull_s16(d26s16, d0s16);
+  q5s32 = vmull_s16(d27s16, d0s16);
+  q2s32 = vmull_s16(d26s16, d1s16);
+  q6s32 = vmull_s16(d27s16, d1s16);
+
+  d30s16 = vdup_n_s16((int16_t)cospi_26_64);
+  d31s16 = vdup_n_s16((int16_t)cospi_6_64);
+
+  q4s32 = vmlal_s16(q4s32, d20s16, d1s16);
+  q5s32 = vmlal_s16(q5s32, d21s16, d1s16);
+  q2s32 = vmlsl_s16(q2s32, d20s16, d0s16);
+  q6s32 = vmlsl_s16(q6s32, d21s16, d0s16);
+
+  q0s32 = vmull_s16(d18s16, d30s16);
+  q13s32 = vmull_s16(d19s16, d30s16);
+
+  q0s32 = vmlal_s16(q0s32, d28s16, d31s16);
+  q13s32 = vmlal_s16(q13s32, d29s16, d31s16);
+
+  q10s32 = vmull_s16(d18s16, d31s16);
+  q9s32 = vmull_s16(d19s16, d31s16);
+
+  q10s32 = vmlsl_s16(q10s32, d28s16, d30s16);
+  q9s32 = vmlsl_s16(q9s32, d29s16, d30s16);
+
+  q14s32 = vaddq_s32(q2s32, q10s32);
+  q15s32 = vaddq_s32(q6s32, q9s32);
+  q2s32 = vsubq_s32(q2s32, q10s32);
+  q6s32 = vsubq_s32(q6s32, q9s32);
+
+  d28s16 = vqrshrn_n_s32(q14s32, 14);
+  d29s16 = vqrshrn_n_s32(q15s32, 14);
+  d4s16 = vqrshrn_n_s32(q2s32, 14);
+  d5s16 = vqrshrn_n_s32(q6s32, 14);
+  *q14s16 = vcombine_s16(d28s16, d29s16);
+
+  q9s32 = vaddq_s32(q4s32, q0s32);
+  q10s32 = vaddq_s32(q5s32, q13s32);
+  q4s32 = vsubq_s32(q4s32, q0s32);
+  q5s32 = vsubq_s32(q5s32, q13s32);
+
+  d30s16 = vdup_n_s16((int16_t)cospi_8_64);
+  d31s16 = vdup_n_s16((int16_t)cospi_24_64);
+
+  d18s16 = vqrshrn_n_s32(q9s32, 14);
+  d19s16 = vqrshrn_n_s32(q10s32, 14);
+  d8s16 = vqrshrn_n_s32(q4s32, 14);
+  d9s16 = vqrshrn_n_s32(q5s32, 14);
+  *q9s16 = vcombine_s16(d18s16, d19s16);
+
+  q5s32 = vmull_s16(d2s16, d30s16);
+  q6s32 = vmull_s16(d3s16, d30s16);
+  q7s32 = vmull_s16(d2s16, d31s16);
+  q0s32 = vmull_s16(d3s16, d31s16);
+
+  q5s32 = vmlal_s16(q5s32, d6s16, d31s16);
+  q6s32 = vmlal_s16(q6s32, d7s16, d31s16);
+  q7s32 = vmlsl_s16(q7s32, d6s16, d30s16);
+  q0s32 = vmlsl_s16(q0s32, d7s16, d30s16);
+
+  q1s32 = vmull_s16(d4s16, d30s16);
+  q3s32 = vmull_s16(d5s16, d30s16);
+  q10s32 = vmull_s16(d4s16, d31s16);
+  q2s32 = vmull_s16(d5s16, d31s16);
+
+  q1s32 = vmlsl_s16(q1s32, d8s16, d31s16);
+  q3s32 = vmlsl_s16(q3s32, d9s16, d31s16);
+  q10s32 = vmlal_s16(q10s32, d8s16, d30s16);
+  q2s32 = vmlal_s16(q2s32, d9s16, d30s16);
+
+  *q8s16 = vaddq_s16(*q11s16, *q9s16);
+  *q11s16 = vsubq_s16(*q11s16, *q9s16);
+  q4s16 = vaddq_s16(*q12s16, *q14s16);
+  *q12s16 = vsubq_s16(*q12s16, *q14s16);
+
+  q14s32 = vaddq_s32(q5s32, q1s32);
+  q15s32 = vaddq_s32(q6s32, q3s32);
+  q5s32 = vsubq_s32(q5s32, q1s32);
+  q6s32 = vsubq_s32(q6s32, q3s32);
+
+  d18s16 = vqrshrn_n_s32(q14s32, 14);
+  d19s16 = vqrshrn_n_s32(q15s32, 14);
+  d10s16 = vqrshrn_n_s32(q5s32, 14);
+  d11s16 = vqrshrn_n_s32(q6s32, 14);
+  *q9s16 = vcombine_s16(d18s16, d19s16);
+
+  q1s32 = vaddq_s32(q7s32, q10s32);
+  q3s32 = vaddq_s32(q0s32, q2s32);
+  q7s32 = vsubq_s32(q7s32, q10s32);
+  q0s32 = vsubq_s32(q0s32, q2s32);
+
+  d28s16 = vqrshrn_n_s32(q1s32, 14);
+  d29s16 = vqrshrn_n_s32(q3s32, 14);
+  d14s16 = vqrshrn_n_s32(q7s32, 14);
+  d15s16 = vqrshrn_n_s32(q0s32, 14);
+  *q14s16 = vcombine_s16(d28s16, d29s16);
+
+  d30s16 = vdup_n_s16((int16_t)cospi_16_64);
+
+  d22s16 = vget_low_s16(*q11s16);
+  d23s16 = vget_high_s16(*q11s16);
+  q2s32 = vmull_s16(d22s16, d30s16);
+  q3s32 = vmull_s16(d23s16, d30s16);
+  q13s32 = vmull_s16(d22s16, d30s16);
+  q1s32 = vmull_s16(d23s16, d30s16);
+
+  d24s16 = vget_low_s16(*q12s16);
+  d25s16 = vget_high_s16(*q12s16);
+  q2s32 = vmlal_s16(q2s32, d24s16, d30s16);
+  q3s32 = vmlal_s16(q3s32, d25s16, d30s16);
+  q13s32 = vmlsl_s16(q13s32, d24s16, d30s16);
+  q1s32 = vmlsl_s16(q1s32, d25s16, d30s16);
+
+  d4s16 = vqrshrn_n_s32(q2s32, 14);
+  d5s16 = vqrshrn_n_s32(q3s32, 14);
+  d24s16 = vqrshrn_n_s32(q13s32, 14);
+  d25s16 = vqrshrn_n_s32(q1s32, 14);
+  q2s16 = vcombine_s16(d4s16, d5s16);
+  *q12s16 = vcombine_s16(d24s16, d25s16);
+
+  q13s32 = vmull_s16(d10s16, d30s16);
+  q1s32 = vmull_s16(d11s16, d30s16);
+  q11s32 = vmull_s16(d10s16, d30s16);
+  q0s32 = vmull_s16(d11s16, d30s16);
+
+  q13s32 = vmlal_s16(q13s32, d14s16, d30s16);
+  q1s32 = vmlal_s16(q1s32, d15s16, d30s16);
+  q11s32 = vmlsl_s16(q11s32, d14s16, d30s16);
+  q0s32 = vmlsl_s16(q0s32, d15s16, d30s16);
+
+  d20s16 = vqrshrn_n_s32(q13s32, 14);
+  d21s16 = vqrshrn_n_s32(q1s32, 14);
+  d12s16 = vqrshrn_n_s32(q11s32, 14);
+  d13s16 = vqrshrn_n_s32(q0s32, 14);
+  *q10s16 = vcombine_s16(d20s16, d21s16);
+  q6s16 = vcombine_s16(d12s16, d13s16);
+
+  q5s16 = vdupq_n_s16(0);
+
+  *q9s16 = vsubq_s16(q5s16, *q9s16);
+  *q11s16 = vsubq_s16(q5s16, q2s16);
+  *q13s16 = vsubq_s16(q5s16, q6s16);
+  *q15s16 = vsubq_s16(q5s16, q4s16);
+  return;
+}
+
+void av1_iht8x8_64_add_neon(const tran_low_t *input, uint8_t *dest,
+                            int dest_stride, int tx_type) {
+  int i;
+  uint8_t *d1, *d2;
+  uint8x8_t d0u8, d1u8, d2u8, d3u8;
+  uint64x1_t d0u64, d1u64, d2u64, d3u64;
+  int16x8_t q8s16, q9s16, q10s16, q11s16, q12s16, q13s16, q14s16, q15s16;
+  uint16x8_t q8u16, q9u16, q10u16, q11u16;
+
+  q8s16 = vld1q_s16(input);
+  q9s16 = vld1q_s16(input + 8);
+  q10s16 = vld1q_s16(input + 8 * 2);
+  q11s16 = vld1q_s16(input + 8 * 3);
+  q12s16 = vld1q_s16(input + 8 * 4);
+  q13s16 = vld1q_s16(input + 8 * 5);
+  q14s16 = vld1q_s16(input + 8 * 6);
+  q15s16 = vld1q_s16(input + 8 * 7);
+
+  TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+               &q15s16);
+
+  switch (tx_type) {
+    case 0:  // idct_idct is not supported. Fall back to C
+      av1_iht8x8_64_add_c(input, dest, dest_stride, tx_type);
+      return;
+      break;
+    case 1:  // iadst_idct
+      // generate IDCT constants
+      // GENERATE_IDCT_CONSTANTS
+
+      // first transform rows
+      IDCT8x8_1D(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                 &q15s16);
+
+      // transpose the matrix
+      TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                   &q15s16);
+
+      // generate IADST constants
+      // GENERATE_IADST_CONSTANTS
+
+      // then transform columns
+      IADST8X8_1D(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                  &q15s16);
+      break;
+    case 2:  // idct_iadst
+      // generate IADST constants
+      // GENERATE_IADST_CONSTANTS
+
+      // first transform rows
+      IADST8X8_1D(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                  &q15s16);
+
+      // transpose the matrix
+      TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                   &q15s16);
+
+      // generate IDCT constants
+      // GENERATE_IDCT_CONSTANTS
+
+      // then transform columns
+      IDCT8x8_1D(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                 &q15s16);
+      break;
+    case 3:  // iadst_iadst
+      // generate IADST constants
+      // GENERATE_IADST_CONSTANTS
+
+      // first transform rows
+      IADST8X8_1D(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                  &q15s16);
+
+      // transpose the matrix
+      TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                   &q15s16);
+
+      // then transform columns
+      IADST8X8_1D(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
+                  &q15s16);
+      break;
+    default:  // iadst_idct
+      assert(0);
+      break;
+  }
+
+  q8s16 = vrshrq_n_s16(q8s16, 5);
+  q9s16 = vrshrq_n_s16(q9s16, 5);
+  q10s16 = vrshrq_n_s16(q10s16, 5);
+  q11s16 = vrshrq_n_s16(q11s16, 5);
+  q12s16 = vrshrq_n_s16(q12s16, 5);
+  q13s16 = vrshrq_n_s16(q13s16, 5);
+  q14s16 = vrshrq_n_s16(q14s16, 5);
+  q15s16 = vrshrq_n_s16(q15s16, 5);
+
+  for (d1 = d2 = dest, i = 0; i < 2; i++) {
+    if (i != 0) {
+      q8s16 = q12s16;
+      q9s16 = q13s16;
+      q10s16 = q14s16;
+      q11s16 = q15s16;
+    }
+
+    d0u64 = vld1_u64((uint64_t *)d1);
+    d1 += dest_stride;
+    d1u64 = vld1_u64((uint64_t *)d1);
+    d1 += dest_stride;
+    d2u64 = vld1_u64((uint64_t *)d1);
+    d1 += dest_stride;
+    d3u64 = vld1_u64((uint64_t *)d1);
+    d1 += dest_stride;
+
+    q8u16 = vaddw_u8(vreinterpretq_u16_s16(q8s16), vreinterpret_u8_u64(d0u64));
+    q9u16 = vaddw_u8(vreinterpretq_u16_s16(q9s16), vreinterpret_u8_u64(d1u64));
+    q10u16 =
+        vaddw_u8(vreinterpretq_u16_s16(q10s16), vreinterpret_u8_u64(d2u64));
+    q11u16 =
+        vaddw_u8(vreinterpretq_u16_s16(q11s16), vreinterpret_u8_u64(d3u64));
+
+    d0u8 = vqmovun_s16(vreinterpretq_s16_u16(q8u16));
+    d1u8 = vqmovun_s16(vreinterpretq_s16_u16(q9u16));
+    d2u8 = vqmovun_s16(vreinterpretq_s16_u16(q10u16));
+    d3u8 = vqmovun_s16(vreinterpretq_s16_u16(q11u16));
+
+    vst1_u64((uint64_t *)d2, vreinterpret_u64_u8(d0u8));
+    d2 += dest_stride;
+    vst1_u64((uint64_t *)d2, vreinterpret_u64_u8(d1u8));
+    d2 += dest_stride;
+    vst1_u64((uint64_t *)d2, vreinterpret_u64_u8(d2u8));
+    d2 += dest_stride;
+    vst1_u64((uint64_t *)d2, vreinterpret_u64_u8(d3u8));
+    d2 += dest_stride;
+  }
+  return;
+}