fix: breakpad use miniz

third_party/zlib-ng/arch/generic/compare256_p.h

@@ -0,0 +1,123 @@
+/* compare256_p.h -- 256 byte memory comparison with match length return
+ * Copyright (C) 2020 Nathan Moinvaziri
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zmemory.h"
+#include "deflate.h"
+#include "fallback_builtins.h"
+
+/* 8-bit integer comparison */
+static inline uint32_t compare256_8(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t len = 0;
+
+    do {
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+        if (*src0 != *src1)
+            return len;
+        src0 += 1, src1 += 1, len += 1;
+    } while (len < 256);
+
+    return 256;
+}
+
+/* 16-bit integer comparison */
+static inline uint32_t compare256_16(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t len = 0;
+
+    do {
+        if (zng_memcmp_2(src0, src1) != 0)
+            return len + (*src0 == *src1);
+        src0 += 2, src1 += 2, len += 2;
+
+        if (zng_memcmp_2(src0, src1) != 0)
+            return len + (*src0 == *src1);
+        src0 += 2, src1 += 2, len += 2;
+
+        if (zng_memcmp_2(src0, src1) != 0)
+            return len + (*src0 == *src1);
+        src0 += 2, src1 += 2, len += 2;
+
+        if (zng_memcmp_2(src0, src1) != 0)
+            return len + (*src0 == *src1);
+        src0 += 2, src1 += 2, len += 2;
+    } while (len < 256);
+
+    return 256;
+}
+
+#ifdef HAVE_BUILTIN_CTZ
+/* 32-bit integer comparison */
+static inline uint32_t compare256_32(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t len = 0;
+
+    do {
+        uint32_t sv, mv, diff;
+
+        sv = zng_memread_4(src0);
+        mv = zng_memread_4(src1);
+
+        diff = sv ^ mv;
+        if (diff) {
+#  if BYTE_ORDER == LITTLE_ENDIAN
+            uint32_t match_byte = __builtin_ctz(diff) / 8;
+#  else
+            uint32_t match_byte = __builtin_clz(diff) / 8;
+#  endif
+            return len + match_byte;
+        }
+
+        src0 += 4, src1 += 4, len += 4;
+    } while (len < 256);
+
+    return 256;
+}
+#endif
+
+#ifdef HAVE_BUILTIN_CTZLL
+/* 64-bit integer comparison */
+static inline uint32_t compare256_64(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t len = 0;
+
+    do {
+        uint64_t sv, mv, diff;
+
+        sv = zng_memread_8(src0);
+        mv = zng_memread_8(src1);
+
+        diff = sv ^ mv;
+        if (diff) {
+#  if BYTE_ORDER == LITTLE_ENDIAN
+            uint64_t match_byte = __builtin_ctzll(diff) / 8;
+#  else
+            uint64_t match_byte = __builtin_clzll(diff) / 8;
+#  endif
+            return len + (uint32_t)match_byte;
+        }
+
+        src0 += 8, src1 += 8, len += 8;
+    } while (len < 256);
+
+    return 256;
+}
+#endif