1 files changed, 102 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/common/arm/neon/iwalsh_neon.c b/media/libvpx/libvpx/vp8/common/arm/neon/iwalsh_neon.c
new file mode 100644
index 0000000000..91600bfc00
--- /dev/null
+++ b/media/libvpx/libvpx/vp8/common/arm/neon/iwalsh_neon.c
@@ -0,0 +1,102 @@
+/*
+ *  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 "./vp8_rtcd.h"
+
+void vp8_short_inv_walsh4x4_neon(int16_t *input, int16_t *mb_dqcoeff) {
+  int16x8_t q0s16, q1s16, q2s16, q3s16;
+  int16x4_t d4s16, d5s16, d6s16, d7s16;
+  int16x4x2_t v2tmp0, v2tmp1;
+  int32x2x2_t v2tmp2, v2tmp3;
+  int16x8_t qAdd3;
+
+  q0s16 = vld1q_s16(input);
+  q1s16 = vld1q_s16(input + 8);
+
+  // 1st for loop
+  d4s16 = vadd_s16(vget_low_s16(q0s16), vget_high_s16(q1s16));
+  d6s16 = vadd_s16(vget_high_s16(q0s16), vget_low_s16(q1s16));
+  d5s16 = vsub_s16(vget_low_s16(q0s16), vget_high_s16(q1s16));
+  d7s16 = vsub_s16(vget_high_s16(q0s16), vget_low_s16(q1s16));
+
+  q2s16 = vcombine_s16(d4s16, d5s16);
+  q3s16 = vcombine_s16(d6s16, d7s16);
+
+  q0s16 = vaddq_s16(q2s16, q3s16);
+  q1s16 = vsubq_s16(q2s16, q3s16);
+
+  v2tmp2 = vtrn_s32(vreinterpret_s32_s16(vget_low_s16(q0s16)),
+                    vreinterpret_s32_s16(vget_low_s16(q1s16)));
+  v2tmp3 = vtrn_s32(vreinterpret_s32_s16(vget_high_s16(q0s16)),
+                    vreinterpret_s32_s16(vget_high_s16(q1s16)));
+  v2tmp0 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[0]),
+                    vreinterpret_s16_s32(v2tmp3.val[0]));
+  v2tmp1 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[1]),
+                    vreinterpret_s16_s32(v2tmp3.val[1]));
+
+  // 2nd for loop
+  d4s16 = vadd_s16(v2tmp0.val[0], v2tmp1.val[1]);
+  d6s16 = vadd_s16(v2tmp0.val[1], v2tmp1.val[0]);
+  d5s16 = vsub_s16(v2tmp0.val[0], v2tmp1.val[1]);
+  d7s16 = vsub_s16(v2tmp0.val[1], v2tmp1.val[0]);
+  q2s16 = vcombine_s16(d4s16, d5s16);
+  q3s16 = vcombine_s16(d6s16, d7s16);
+
+  qAdd3 = vdupq_n_s16(3);
+
+  q0s16 = vaddq_s16(q2s16, q3s16);
+  q1s16 = vsubq_s16(q2s16, q3s16);
+
+  q0s16 = vaddq_s16(q0s16, qAdd3);
+  q1s16 = vaddq_s16(q1s16, qAdd3);
+
+  q0s16 = vshrq_n_s16(q0s16, 3);
+  q1s16 = vshrq_n_s16(q1s16, 3);
+
+  // store
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q0s16), 0);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q0s16), 0);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q1s16), 0);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q1s16), 0);
+  mb_dqcoeff += 16;
+
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q0s16), 1);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q0s16), 1);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q1s16), 1);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q1s16), 1);
+  mb_dqcoeff += 16;
+
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q0s16), 2);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q0s16), 2);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q1s16), 2);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q1s16), 2);
+  mb_dqcoeff += 16;
+
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q0s16), 3);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q0s16), 3);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_low_s16(q1s16), 3);
+  mb_dqcoeff += 16;
+  vst1_lane_s16(mb_dqcoeff, vget_high_s16(q1s16), 3);
+  mb_dqcoeff += 16;
+  return;
+}