1 files changed, 59 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_dsp/arm/idct4x4_add_neon.c b/media/libvpx/libvpx/vpx_dsp/arm/idct4x4_add_neon.c
new file mode 100644
index 0000000000..8192ee4cf8
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_dsp/arm/idct4x4_add_neon.c
@@ -0,0 +1,59 @@
+/*
+ *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <arm_neon.h>
+#include <assert.h>
+
+#include "./vpx_dsp_rtcd.h"
+#include "vpx_dsp/arm/idct_neon.h"
+#include "vpx_dsp/arm/mem_neon.h"
+#include "vpx_dsp/txfm_common.h"
+
+void vpx_idct4x4_16_add_neon(const tran_low_t *input, uint8_t *dest,
+                             int stride) {
+  const uint8_t *dst = dest;
+  uint32x2_t s32 = vdup_n_u32(0);
+  int16x8_t a[2];
+  uint8x8_t s, d[2];
+  uint16x8_t sum[2];
+
+  assert(!((intptr_t)dest % sizeof(uint32_t)));
+  assert(!(stride % sizeof(uint32_t)));
+
+  // Rows
+  a[0] = load_tran_low_to_s16q(input);
+  a[1] = load_tran_low_to_s16q(input + 8);
+  transpose_idct4x4_16_bd8(a);
+
+  // Columns
+  a[1] = vcombine_s16(vget_high_s16(a[1]), vget_low_s16(a[1]));
+  transpose_idct4x4_16_bd8(a);
+  a[0] = vrshrq_n_s16(a[0], 4);
+  a[1] = vrshrq_n_s16(a[1], 4);
+
+  s = load_u8(dst, stride);
+  dst += 2 * stride;
+  // The elements are loaded in reverse order.
+  s32 = vld1_lane_u32((const uint32_t *)dst, s32, 1);
+  dst += stride;
+  s32 = vld1_lane_u32((const uint32_t *)dst, s32, 0);
+
+  sum[0] = vaddw_u8(vreinterpretq_u16_s16(a[0]), s);
+  sum[1] = vaddw_u8(vreinterpretq_u16_s16(a[1]), vreinterpret_u8_u32(s32));
+  d[0] = vqmovun_s16(vreinterpretq_s16_u16(sum[0]));
+  d[1] = vqmovun_s16(vreinterpretq_s16_u16(sum[1]));
+
+  store_u8(dest, stride, d[0]);
+  dest += 2 * stride;
+  // The elements are stored in reverse order.
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d[1]), 1);
+  dest += stride;
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d[1]), 0);
+}