Move libyuv/files/ directly under libyuv

Test: TreeHugger
Merged-In: I773d1ae01539cc5d200768b526f10b2922567f72
Change-Id: I4ba1f1e781d7fd3ad96639dfdc08f654e45ae3d3

1 files changed, 96 insertions, 0 deletions

diff --git a/source/compare_neon.cc b/source/compare_neon.cc
new file mode 100644
index 00000000..afdd6012
--- /dev/null
+++ b/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