From 678702573531f19ae36847a6a07257aaae623fbe Mon Sep 17 00:00:00 2001
From: Sadaf Ebrahimi <sadafebrahimi@google.com>
Date: Fri, 25 Aug 2023 16:27:50 +0000
Subject: Move libyuv/files/ directly under libyuv

Test: TreeHugger
Merged-In: I773d1ae01539cc5d200768b526f10b2922567f72
Change-Id: I4ba1f1e781d7fd3ad96639dfdc08f654e45ae3d3
---
 source/compare_neon64.cc | 94 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 source/compare_neon64.cc

(limited to 'source/compare_neon64.cc')

diff --git a/source/compare_neon64.cc b/source/compare_neon64.cc
new file mode 100644
index 00000000..70fb9b91
--- /dev/null
+++ b/source/compare_neon64.cc
@@ -0,0 +1,94 @@
+/*
+ *  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(__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(
+      "movi        v4.8h, #0                     \n"
+
+      "1:                                        \n"
+      "ld1         {v0.16b, v1.16b}, [%0], #32   \n"
+      "ld1         {v2.16b, v3.16b}, [%1], #32   \n"
+      "eor         v0.16b, v0.16b, v2.16b        \n"
+      "prfm        pldl1keep, [%0, 448]          \n"  // prefetch 7 lines ahead
+      "eor         v1.16b, v1.16b, v3.16b        \n"
+      "cnt         v0.16b, v0.16b                \n"
+      "prfm        pldl1keep, [%1, 448]          \n"
+      "cnt         v1.16b, v1.16b                \n"
+      "subs        %w2, %w2, #32                 \n"
+      "add         v0.16b, v0.16b, v1.16b        \n"
+      "uadalp      v4.8h, v0.16b                 \n"
+      "b.gt        1b                            \n"
+
+      "uaddlv      s4, v4.8h                     \n"
+      "fmov        %w3, s4                       \n"
+      : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(diff)
+      :
+      : "cc", "v0", "v1", "v2", "v3", "v4");
+  return diff;
+}
+
+uint32_t SumSquareError_NEON(const uint8_t* src_a,
+                             const uint8_t* src_b,
+                             int count) {
+  uint32_t sse;
+  asm volatile(
+      "eor         v16.16b, v16.16b, v16.16b     \n"
+      "eor         v18.16b, v18.16b, v18.16b     \n"
+      "eor         v17.16b, v17.16b, v17.16b     \n"
+      "eor         v19.16b, v19.16b, v19.16b     \n"
+
+      "1:                                        \n"
+      "ld1         {v0.16b}, [%0], #16           \n"
+      "ld1         {v1.16b}, [%1], #16           \n"
+      "subs        %w2, %w2, #16                 \n"
+      "usubl       v2.8h, v0.8b, v1.8b           \n"
+      "usubl2      v3.8h, v0.16b, v1.16b         \n"
+      "prfm        pldl1keep, [%0, 448]          \n"  // prefetch 7 lines ahead
+      "smlal       v16.4s, v2.4h, v2.4h          \n"
+      "smlal       v17.4s, v3.4h, v3.4h          \n"
+      "prfm        pldl1keep, [%1, 448]          \n"
+      "smlal2      v18.4s, v2.8h, v2.8h          \n"
+      "smlal2      v19.4s, v3.8h, v3.8h          \n"
+      "b.gt        1b                            \n"
+
+      "add         v16.4s, v16.4s, v17.4s        \n"
+      "add         v18.4s, v18.4s, v19.4s        \n"
+      "add         v19.4s, v16.4s, v18.4s        \n"
+      "addv        s0, v19.4s                    \n"
+      "fmov        %w3, s0                       \n"
+      : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(sse)
+      :
+      : "cc", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19");
+  return sse;
+}
+
+#endif  // !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
+
+#ifdef __cplusplus
+}  // extern "C"
+}  // namespace libyuv
+#endif
-- 
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