1 files changed, 96 insertions, 0 deletions
diff --git a/media/libyuv/libyuv/source/compare_neon.cc b/media/libyuv/libyuv/source/compare_neon.cc
new file mode 100644
index 0000000000..2a2181e0cb
--- /dev/null
+++ b/media/libyuv/libyuv/source/compare_neon.cc
@@ -0,0 +1,96 @@
+/*
+ *  Copyright 2012 The LibYuv 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 "libyuv/basic_types.h"
+
+#include "libyuv/compare_row.h"
+#include "libyuv/row.h"
+
+#ifdef __cplusplus
+namespace libyuv {
+extern "C" {
+#endif
+
+#if !defined(LIBYUV_DISABLE_NEON) && defined(__ARM_NEON__) && \
+    !defined(__aarch64__)
+
+// 256 bits at a time
+// uses short accumulator which restricts count to 131 KB
+uint32_t HammingDistance_NEON(const uint8_t* src_a,
+                              const uint8_t* src_b,
+                              int count) {
+  uint32_t diff;
+
+  asm volatile(
+      "vmov.u16   q4, #0                         \n"  // accumulator
+
+      "1:                                        \n"
+      "vld1.8     {q0, q1}, [%0]!                \n"
+      "vld1.8     {q2, q3}, [%1]!                \n"
+      "veor.32    q0, q0, q2                     \n"
+      "veor.32    q1, q1, q3                     \n"
+      "vcnt.i8    q0, q0                         \n"
+      "vcnt.i8    q1, q1                         \n"
+      "subs       %2, %2, #32                    \n"
+      "vadd.u8    q0, q0, q1                     \n"  // 16 byte counts
+      "vpadal.u8  q4, q0                         \n"  // 8 shorts
+      "bgt        1b                             \n"
+
+      "vpaddl.u16 q0, q4                         \n"  // 4 ints
+      "vpadd.u32  d0, d0, d1                     \n"
+      "vpadd.u32  d0, d0, d0                     \n"
+      "vmov.32    %3, d0[0]                      \n"
+
+      : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(diff)
+      :
+      : "cc", "q0", "q1", "q2", "q3", "q4");
+  return diff;
+}
+
+uint32_t SumSquareError_NEON(const uint8_t* src_a,
+                             const uint8_t* src_b,
+                             int count) {
+  uint32_t sse;
+  asm volatile(
+      "vmov.u8    q8, #0                         \n"
+      "vmov.u8    q10, #0                        \n"
+      "vmov.u8    q9, #0                         \n"
+      "vmov.u8    q11, #0                        \n"
+
+      "1:                                        \n"
+      "vld1.8     {q0}, [%0]!                    \n"
+      "vld1.8     {q1}, [%1]!                    \n"
+      "subs       %2, %2, #16                    \n"
+      "vsubl.u8   q2, d0, d2                     \n"
+      "vsubl.u8   q3, d1, d3                     \n"
+      "vmlal.s16  q8, d4, d4                     \n"
+      "vmlal.s16  q9, d6, d6                     \n"
+      "vmlal.s16  q10, d5, d5                    \n"
+      "vmlal.s16  q11, d7, d7                    \n"
+      "bgt        1b                             \n"
+
+      "vadd.u32   q8, q8, q9                     \n"
+      "vadd.u32   q10, q10, q11                  \n"
+      "vadd.u32   q11, q8, q10                   \n"
+      "vpaddl.u32 q1, q11                        \n"
+      "vadd.u64   d0, d2, d3                     \n"
+      "vmov.32    %3, d0[0]                      \n"
+      : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(sse)
+      :
+      : "memory", "cc", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11");
+  return sse;
+}
+
+#endif  // defined(__ARM_NEON__) && !defined(__aarch64__)
+
+#ifdef __cplusplus
+}  // extern "C"
+}  // namespace libyuv
+#endif