vendor: OpenCV 5.0.0 snapshot at 40738fb16ceddb5fb3fea747585f7ce6abb0605b

2026-08-22 00:10:33 +08:00
commit f7f077da11
6933 changed files with 2335208 additions and 0 deletions
@@ -0,0 +1,134 @@
+/* compare256_rle.h -- 256 byte run-length encoding comparison
+ * Copyright (C) 2022 Nathan Moinvaziri
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zbuild.h"
+#include "fallback_builtins.h"
+
+typedef uint32_t (*compare256_rle_func)(const uint8_t* src0, const uint8_t* src1);
+
+/* ALIGNED, byte comparison */
+static inline uint32_t compare256_rle_c(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t len = 0;
+
+    do {
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src1 += 1, len += 1;
+    } while (len < 256);
+
+    return 256;
+}
+
+#ifdef UNALIGNED_OK
+/* 16-bit unaligned integer comparison */
+static inline uint32_t compare256_rle_unaligned_16(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t len = 0;
+    uint16_t src0_cmp, src1_cmp;
+
+    memcpy(&src0_cmp, src0, sizeof(src0_cmp));
+
+    do {
+        memcpy(&src1_cmp, src1, sizeof(src1_cmp));
+        if (src0_cmp != src1_cmp)
+            return len + (*src0 == *src1);
+        src1 += 2, len += 2;
+        memcpy(&src1_cmp, src1, sizeof(src1_cmp));
+        if (src0_cmp != src1_cmp)
+            return len + (*src0 == *src1);
+        src1 += 2, len += 2;
+        memcpy(&src1_cmp, src1, sizeof(src1_cmp));
+        if (src0_cmp != src1_cmp)
+            return len + (*src0 == *src1);
+        src1 += 2, len += 2;
+        memcpy(&src1_cmp, src1, sizeof(src1_cmp));
+        if (src0_cmp != src1_cmp)
+            return len + (*src0 == *src1);
+        src1 += 2, len += 2;
+    } while (len < 256);
+
+    return 256;
+}
+
+#ifdef HAVE_BUILTIN_CTZ
+/* 32-bit unaligned integer comparison */
+static inline uint32_t compare256_rle_unaligned_32(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t sv, len = 0;
+    uint16_t src0_cmp;
+
+    memcpy(&src0_cmp, src0, sizeof(src0_cmp));
+    sv = ((uint32_t)src0_cmp << 16) | src0_cmp;
+
+    do {
+        uint32_t mv, diff;
+
+        memcpy(&mv, src1, sizeof(mv));
+
+        diff = sv ^ mv;
+        if (diff) {
+            uint32_t match_byte = __builtin_ctz(diff) / 8;
+            return len + match_byte;
+        }
+
+        src1 += 4, len += 4;
+    } while (len < 256);
+
+    return 256;
+}
+
+#endif
+
+#if defined(UNALIGNED64_OK) && defined(HAVE_BUILTIN_CTZLL)
+/* 64-bit unaligned integer comparison */
+static inline uint32_t compare256_rle_unaligned_64(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t src0_cmp32, len = 0;
+    uint16_t src0_cmp;
+    uint64_t sv;
+
+    memcpy(&src0_cmp, src0, sizeof(src0_cmp));
+    src0_cmp32 = ((uint32_t)src0_cmp << 16) | src0_cmp;
+    sv = ((uint64_t)src0_cmp32 << 32) | src0_cmp32;
+
+    do {
+        uint64_t mv, diff;
+
+        memcpy(&mv, src1, sizeof(mv));
+
+        diff = sv ^ mv;
+        if (diff) {
+            uint64_t match_byte = __builtin_ctzll(diff) / 8;
+            return len + (uint32_t)match_byte;
+        }
+
+        src1 += 8, len += 8;
+    } while (len < 256);
+
+    return 256;
+}
+
+#endif
+
+#endif
+