Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/mysys/crc32ieee.cc b/mysys/crc32ieee.cc
new file mode 100644
index 00000000..bbafa123
--- /dev/null
+++ b/mysys/crc32ieee.cc
@@ -0,0 +1,61 @@
+/* Copyright (c) 2020, 2021, MariaDB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+
+#include <my_global.h>
+#include <my_sys.h>
+#include <zlib.h>
+
+/* TODO: remove this once zlib adds inherent support for hardware accelerated
+crc32 for all architectures. */
+static unsigned int my_crc32_zlib(unsigned int crc, const void *data,
+                                  size_t len)
+{
+  return (unsigned int) crc32(crc, (const Bytef *)data, (unsigned int) len);
+}
+
+#ifdef HAVE_PCLMUL
+extern "C" int crc32_pclmul_enabled();
+extern "C" unsigned int crc32_pclmul(unsigned int, const void *, size_t);
+#elif defined(__GNUC__) && defined(HAVE_ARMV8_CRC)
+extern "C" int crc32_aarch64_available();
+extern "C" unsigned int crc32_aarch64(unsigned int, const void *, size_t);
+#endif
+
+
+typedef unsigned int (*my_crc32_t)(unsigned int, const void *, size_t);
+
+static my_crc32_t init_crc32()
+{
+#ifdef HAVE_PCLMUL
+  if (crc32_pclmul_enabled())
+    return crc32_pclmul;
+#elif defined(__GNUC__) && defined(HAVE_ARMV8_CRC)
+  if (crc32_aarch64_available())
+    return crc32_aarch64;
+#endif
+  return my_crc32_zlib;
+}
+
+static const my_crc32_t my_checksum_func= init_crc32();
+
+#ifdef __powerpc64__
+# error "my_checksum() is defined in mysys/crc32/crc32_ppc64.c"
+#endif
+extern "C"
+unsigned int my_checksum(unsigned int crc, const void *data, size_t len)
+{
+  return my_checksum_func(crc, data, len);
+}