libvpx: Pull from upstream

source/libvpx/vp9/common/arm/neon/vp9_idct32x32_neon.c

Index: source/libvpx/vp9/common/arm/neon/vp9_idct32x32_neon.c
===================================================================
--- source/libvpx/vp9/common/arm/neon/vp9_idct32x32_neon.c	(revision 0)
+++ source/libvpx/vp9/common/arm/neon/vp9_idct32x32_neon.c	(revision 0)
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2013 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 "vp9/common/vp9_common.h"
+
+// defined in vp9/common/arm/neon/vp9_short_idct32x32_add_neon.asm
+extern void idct32_transpose_and_transform(int16_t *transpose_buffer,
+                                           int16_t *output, int16_t *input);
+extern void idct32_combine_add(uint8_t *dest, int16_t *out, int dest_stride);
+
+
+// defined in vp9/common/arm/neon/vp9_short_idct16x16_add_neon.asm
+extern void save_neon_registers();
+extern void restore_neon_registers();
+
+void vp9_short_idct32x32_add_neon(int16_t *input, uint8_t *dest,
+                                  int dest_stride) {
+  // TODO(cd): move the creation of these buffers within the ASM file
+  // internal buffer used to transpose 8 lines into before transforming them
+  int16_t transpose_buffer[32 * 8];
+  // results of the first pass (transpose and transform rows)
+  int16_t pass1[32 * 32];
+  // results of the second pass (transpose and transform columns)
+  int16_t pass2[32 * 32];
+
+  // save register we need to preserve
+  save_neon_registers();
+  // process rows
+  idct32_transpose_and_transform(transpose_buffer, pass1, input);
+  // process columns
+  // TODO(cd): do these two steps/passes within the ASM file
+  idct32_transpose_and_transform(transpose_buffer, pass2, pass1);
+  // combine and add to dest
+  // TODO(cd): integrate this within the last storage step of the second pass
+  idct32_combine_add(dest, pass2, dest_stride);
+  // restore register we need to preserve
+  restore_neon_registers();
+}
+
+// TODO(cd): Eliminate this file altogether when everything is in ASM file