Changeset 5633 for pjproject/trunk/third_party/yuv/source/compare_neon64.cc

Timestamp:

Jul 28, 2017 2:51:44 AM (7 years ago)

Author:

nanang

Message:

Re #2004: Update libyuv version from libyuv git master repo dated 27 July 2017, the compile errors on old gcc versions issue persists though.

File:

• pjproject/trunk/third_party/yuv/source/compare_neon64.cc (modified) (2 diffs)

pjproject/trunk/third_party/yuv/source/compare_neon64.cc

@@ -21 +21 @@
 #if !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
 
+// 256 bits at a time
+// uses short accumulator which restricts count to 131 KB
+uint32 HammingDistance_NEON(const uint8* src_a, const uint8* src_b, int count) {
+  uint32 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"
+    "eor        v1.16b, v1.16b, v3.16b         \n" 
+    "cnt        v0.16b, v0.16b                 \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 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count) {
-  volatile uint32 sse;
+  uint32 sse;
   asm volatile (
     "eor        v16.16b, v16.16b, v16.16b      \n"
@@ -30 +60 @@
 
   "1:                                          \n"
-    MEMACCESS(0)
     "ld1        {v0.16b}, [%0], #16            \n"
-    MEMACCESS(1)
     "ld1        {v1.16b}, [%1], #16            \n"
     "subs       %w2, %w2, #16                  \n"