diff options
Diffstat (limited to 'src/third_party/wiredtiger/src/checksum/zseries/crc32-s390x.c')
| -rw-r--r-- | src/third_party/wiredtiger/src/checksum/zseries/crc32-s390x.c | 102 |
1 files changed, 52 insertions, 50 deletions
diff --git a/src/third_party/wiredtiger/src/checksum/zseries/crc32-s390x.c b/src/third_party/wiredtiger/src/checksum/zseries/crc32-s390x.c index 5edd5775478..3fcfcf69887 100644 --- a/src/third_party/wiredtiger/src/checksum/zseries/crc32-s390x.c +++ b/src/third_party/wiredtiger/src/checksum/zseries/crc32-s390x.c @@ -18,26 +18,31 @@ /* RHEL 7 has kernel support, but does not define this constant in the lib c headers. */ #ifndef HWCAP_S390_VX -#define HWCAP_S390_VX 2048 +#define HWCAP_S390_VX 2048 #endif #include "crc32-s390x.h" #include "slicing-consts.h" -#define VX_MIN_LEN 64 -#define VX_ALIGNMENT 16UL -#define VX_ALIGN_MASK (VX_ALIGNMENT - 1) +#define VX_MIN_LEN 64 +#define VX_ALIGNMENT 16UL +#define VX_ALIGN_MASK (VX_ALIGNMENT - 1) /* Prototypes for functions in assembly files */ unsigned int __wt_crc32c_le_vgfm_16(unsigned int crc, const unsigned char *buf, size_t size); -/* Pure C implementations of CRC, one byte at a time */ -unsigned int __wt_crc32c_le(unsigned int crc, const unsigned char *buf, size_t len){ - crc = htole32(crc); - while (len--) - crc = crc32ctable_le[0][((crc >> 24) ^ *buf++) & 0xFF] ^ (crc << 8); - crc = le32toh(crc); - return crc; +/* + * __wt_crc32c_le -- + * Pure C implementations of CRC, one byte at a time + */ +unsigned int +__wt_crc32c_le(unsigned int crc, const unsigned char *buf, size_t len) +{ + crc = htole32(crc); + while (len--) + crc = crc32ctable_le[0][((crc >> 24) ^ *buf++) & 0xFF] ^ (crc << 8); + crc = le32toh(crc); + return crc; } /* @@ -49,72 +54,69 @@ unsigned int __wt_crc32c_le(unsigned int crc, const unsigned char *buf, size_t l * operations of VECTOR LOAD MULTIPLE instructions. * */ -#define DEFINE_CRC32_VX(___fname, ___crc32_vx, ___crc32_sw) \ - unsigned int ___fname(unsigned int crc, \ - const unsigned char *data, \ - size_t datalen) \ - { \ - unsigned long prealign, aligned, remaining; \ - \ - if ((unsigned long)data & VX_ALIGN_MASK) { \ - prealign = VX_ALIGNMENT - \ - ((unsigned long)data & VX_ALIGN_MASK); \ - datalen -= prealign; \ - crc = ___crc32_sw(crc, data, prealign); \ - data = data + prealign; \ - } \ - \ - if (datalen < VX_MIN_LEN) \ - return ___crc32_sw(crc, data, datalen); \ - \ - aligned = datalen & ~VX_ALIGN_MASK; \ - remaining = datalen & VX_ALIGN_MASK; \ - \ - crc = ___crc32_vx(crc, data, aligned); \ - data = data + aligned; \ - \ - if (remaining) \ - crc = ___crc32_sw(crc, data, remaining); \ - \ - return crc; \ - } +#define DEFINE_CRC32_VX(___fname, ___crc32_vx, ___crc32_sw) \ + unsigned int ___fname(unsigned int crc, const unsigned char *data, size_t datalen) \ + { \ + unsigned long prealign, aligned, remaining; \ + \ + if ((unsigned long)data & VX_ALIGN_MASK) { \ + prealign = VX_ALIGNMENT - ((unsigned long)data & VX_ALIGN_MASK); \ + datalen -= prealign; \ + crc = ___crc32_sw(crc, data, prealign); \ + data = data + prealign; \ + } \ + \ + if (datalen < VX_MIN_LEN) \ + return ___crc32_sw(crc, data, datalen); \ + \ + aligned = datalen & ~VX_ALIGN_MASK; \ + remaining = datalen & VX_ALIGN_MASK; \ + \ + crc = ___crc32_vx(crc, data, aligned); \ + data = data + aligned; \ + \ + if (remaining) \ + crc = ___crc32_sw(crc, data, remaining); \ + \ + return crc; \ + } /* Main CRC-32 functions */ DEFINE_CRC32_VX(__wt_crc32c_le_vx, __wt_crc32c_le_vgfm_16, __wt_crc32c_le) /* * __wt_checksum_hw -- - * WiredTiger: return a checksum for a chunk of memory. + * WiredTiger: return a checksum for a chunk of memory. */ static uint32_t __wt_checksum_hw(const void *chunk, size_t len) { - return (~__wt_crc32c_le_vx(0xffffffff, chunk, len)); + return (~__wt_crc32c_le_vx(0xffffffff, chunk, len)); } #endif extern uint32_t __wt_checksum_sw(const void *chunk, size_t len); #if defined(__GNUC__) extern uint32_t (*wiredtiger_crc32c_func(void))(const void *, size_t) - __attribute__((visibility("default"))); + __attribute__((visibility("default"))); #else extern uint32_t (*wiredtiger_crc32c_func(void))(const void *, size_t); #endif /* * wiredtiger_crc32c_func -- - * WiredTiger: detect CRC hardware and return the checksum function. + * WiredTiger: detect CRC hardware and return the checksum function. */ uint32_t (*wiredtiger_crc32c_func(void))(const void *, size_t) { #if defined(__linux__) && !defined(HAVE_NO_CRC32_HARDWARE) - unsigned long caps = getauxval(AT_HWCAP); + unsigned long caps = getauxval(AT_HWCAP); - if (caps & HWCAP_S390_VX) - return (__wt_checksum_hw); - else - return (__wt_checksum_sw); + if (caps & HWCAP_S390_VX) + return (__wt_checksum_hw); + else + return (__wt_checksum_sw); #else - return (__wt_checksum_sw); + return (__wt_checksum_sw); #endif } |