1 files changed, 47 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_dsp/arm/idct4x4_1_add_neon.c b/media/libvpx/libvpx/vpx_dsp/arm/idct4x4_1_add_neon.c
new file mode 100644
index 0000000000..a14b895431
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_dsp/arm/idct4x4_1_add_neon.c
@@ -0,0 +1,47 @@
+/*
+ *  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/mem_neon.h"
+#include "vpx_dsp/inv_txfm.h"
+
+static INLINE void idct4x4_1_add_kernel(uint8_t **dest, const int stride,
+                                        const int16x8_t res,
+                                        uint32x2_t *const d) {
+  uint16x8_t a;
+  uint8x8_t b;
+  *d = vld1_lane_u32((const uint32_t *)*dest, *d, 0);
+  *d = vld1_lane_u32((const uint32_t *)(*dest + stride), *d, 1);
+  a = vaddw_u8(vreinterpretq_u16_s16(res), vreinterpret_u8_u32(*d));
+  b = vqmovun_s16(vreinterpretq_s16_u16(a));
+  vst1_lane_u32((uint32_t *)*dest, vreinterpret_u32_u8(b), 0);
+  *dest += stride;
+  vst1_lane_u32((uint32_t *)*dest, vreinterpret_u32_u8(b), 1);
+  *dest += stride;
+}
+
+void vpx_idct4x4_1_add_neon(const tran_low_t *input, uint8_t *dest,
+                            int stride) {
+  const int16_t out0 =
+      WRAPLOW(dct_const_round_shift((int16_t)input[0] * cospi_16_64));
+  const int16_t out1 = WRAPLOW(dct_const_round_shift(out0 * cospi_16_64));
+  const int16_t a1 = ROUND_POWER_OF_TWO(out1, 4);
+  const int16x8_t dc = vdupq_n_s16(a1);
+  uint32x2_t d = vdup_n_u32(0);
+
+  assert(!((intptr_t)dest % sizeof(uint32_t)));
+  assert(!(stride % sizeof(uint32_t)));
+
+  idct4x4_1_add_kernel(&dest, stride, dc, &d);
+  idct4x4_1_add_kernel(&dest, stride, dc, &d);
+}