Zlib ng

2026-05-31 04:56:20 +00:00 · 2019-06-30 18:13:46 -07:00
parent d7c110041a
commit e086f53b97
116 changed files with 30587 additions and 13 deletions
@@ -0,0 +1,115 @@
+/* crc32_acle.c -- compute the CRC-32 of a data stream
+ * Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
+ * Copyright (C) 2016 Yang Zhang
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+*/
+
+#ifdef __ARM_FEATURE_CRC32
+# include <arm_acle.h>
+# ifdef ZLIB_COMPAT
+#  include <zconf.h>
+# else
+#  include <zconf-ng.h>
+# endif
+# ifdef __linux__
+#  include <stddef.h>
+# endif
+
+uint32_t crc32_acle(uint32_t crc, const unsigned char *buf, uint64_t len) {
+    register uint32_t c;
+    register const uint16_t *buf2;
+    register const uint32_t *buf4;
+
+    c = ~crc;
+    if (len && ((ptrdiff_t)buf & 1)) {
+        c = __crc32b(c, *buf++);
+        len--;
+    }
+
+    if ((len > sizeof(uint16_t)) && ((ptrdiff_t)buf & sizeof(uint16_t))) {
+        buf2 = (const uint16_t *) buf;
+        c = __crc32h(c, *buf2++);
+        len -= sizeof(uint16_t);
+        buf4 = (const uint32_t *) buf2;
+    } else {
+        buf4 = (const uint32_t *) buf;
+    }
+
+# if defined(__aarch64__)
+    if ((len > sizeof(uint32_t)) && ((ptrdiff_t)buf & sizeof(uint32_t))) {
+        c = __crc32w(c, *buf4++);
+        len -= sizeof(uint32_t);
+    }
+
+    const uint64_t *buf8 = (const uint64_t *) buf4;
+
+#  ifdef UNROLL_MORE
+    while (len >= 4 * sizeof(uint64_t)) {
+        c = __crc32d(c, *buf8++);
+        c = __crc32d(c, *buf8++);
+        c = __crc32d(c, *buf8++);
+        c = __crc32d(c, *buf8++);
+        len -= 4 * sizeof(uint64_t);
+    }
+#  endif
+
+    while (len >= sizeof(uint64_t)) {
+        c = __crc32d(c, *buf8++);
+        len -= sizeof(uint64_t);
+    }
+
+    if (len >= sizeof(uint32_t)) {
+        buf4 = (const uint32_t *) buf8;
+        c = __crc32w(c, *buf4++);
+        len -= sizeof(uint32_t);
+        buf2 = (const uint16_t *) buf4;
+    } else {
+        buf2 = (const uint16_t *) buf8;
+    }
+
+    if (len >= sizeof(uint16_t)) {
+        c = __crc32h(c, *buf2++);
+        len -= sizeof(uint16_t);
+    }
+
+    buf = (const unsigned char *) buf2;
+# else /* __aarch64__ */
+
+#  ifdef UNROLL_MORE
+    while (len >= 8 * sizeof(uint32_t)) {
+        c = __crc32w(c, *buf4++);
+        c = __crc32w(c, *buf4++);
+        c = __crc32w(c, *buf4++);
+        c = __crc32w(c, *buf4++);
+        c = __crc32w(c, *buf4++);
+        c = __crc32w(c, *buf4++);
+        c = __crc32w(c, *buf4++);
+        c = __crc32w(c, *buf4++);
+        len -= 8 * sizeof(uint32_t);
+    }
+#  endif
+
+    while (len >= sizeof(uint32_t)) {
+        c = __crc32w(c, *buf4++);
+        len -= sizeof(uint32_t);
+    }
+
+    if (len >= sizeof(uint16_t)) {
+        buf2 = (const uint16_t *) buf4;
+        c = __crc32h(c, *buf2++);
+        len -= sizeof(uint16_t);
+        buf = (const unsigned char *) buf2;
+    } else {
+        buf = (const unsigned char *) buf4;
+    }
+# endif /* __aarch64__ */
+
+    if (len) {
+        c = __crc32b(c, *buf);
+    }
+
+    c = ~c;
+    return c;
+}
+#endif /* __ARM_FEATURE_CRC32 */