From 5e45211a64149b3c659b90ff2de6fa982a5a93ed Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 14:17:33 +0200 Subject: Adding upstream version 15.5. Signed-off-by: Daniel Baumann --- src/port/pg_crc32c_armv8.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 src/port/pg_crc32c_armv8.c (limited to 'src/port/pg_crc32c_armv8.c') diff --git a/src/port/pg_crc32c_armv8.c b/src/port/pg_crc32c_armv8.c new file mode 100644 index 0000000..9e301f9 --- /dev/null +++ b/src/port/pg_crc32c_armv8.c @@ -0,0 +1,75 @@ +/*------------------------------------------------------------------------- + * + * pg_crc32c_armv8.c + * Compute CRC-32C checksum using ARMv8 CRC Extension instructions + * + * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * src/port/pg_crc32c_armv8.c + * + *------------------------------------------------------------------------- + */ +#include "c.h" + +#include + +#include "port/pg_crc32c.h" + +pg_crc32c +pg_comp_crc32c_armv8(pg_crc32c crc, const void *data, size_t len) +{ + const unsigned char *p = data; + const unsigned char *pend = p + len; + + /* + * ARMv8 doesn't require alignment, but aligned memory access is + * significantly faster. Process leading bytes so that the loop below + * starts with a pointer aligned to eight bytes. + */ + if (!PointerIsAligned(p, uint16) && + p + 1 <= pend) + { + crc = __crc32cb(crc, *p); + p += 1; + } + if (!PointerIsAligned(p, uint32) && + p + 2 <= pend) + { + crc = __crc32ch(crc, *(uint16 *) p); + p += 2; + } + if (!PointerIsAligned(p, uint64) && + p + 4 <= pend) + { + crc = __crc32cw(crc, *(uint32 *) p); + p += 4; + } + + /* Process eight bytes at a time, as far as we can. */ + while (p + 8 <= pend) + { + crc = __crc32cd(crc, *(uint64 *) p); + p += 8; + } + + /* Process remaining 0-7 bytes. */ + if (p + 4 <= pend) + { + crc = __crc32cw(crc, *(uint32 *) p); + p += 4; + } + if (p + 2 <= pend) + { + crc = __crc32ch(crc, *(uint16 *) p); + p += 2; + } + if (p < pend) + { + crc = __crc32cb(crc, *p); + } + + return crc; +} -- cgit v1.2.3