mariadb/extra/crc32-vpmsum/crc32_wrapper.c

#ifdef __powerpc__

#define CRC_TABLE
#include "crc32_constants.h"

#define VMX_ALIGN		 16
#define VMX_ALIGN_MASK		 (VMX_ALIGN-1)

#ifdef REFLECT
static unsigned int crc32_align(unsigned int crc, unsigned char *p,
		 		 		        unsigned long len)
{
		 while (len--)
		 		 crc = crc_table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
		 return crc;
}
#else
static unsigned int crc32_align(unsigned int crc, unsigned char *p,
		 		 		 		 unsigned long len)
{
		 while (len--)
		 		 crc = crc_table[((crc >> 24) ^ *p++) & 0xff] ^ (crc << 8);
		 return crc;
}
#endif

unsigned int __crc32_vpmsum(unsigned int crc, unsigned char *p,
		 		 		     unsigned long len);

unsigned int crc32_vpmsum(unsigned int crc, unsigned char *p,
		 		 		   unsigned long len)
{
		 unsigned int prealign;
		 unsigned int tail;

#ifdef CRC_XOR
		 crc ^= 0xffffffff;
#endif

		 if (len < VMX_ALIGN + VMX_ALIGN_MASK) {
		 		 crc = crc32_align(crc, p, len);
		 		 goto out;
		 }

		 if ((unsigned long)p & VMX_ALIGN_MASK) {
		 		 prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
		 		 crc = crc32_align(crc, p, prealign);
		 		 len -= prealign;
		 		 p += prealign;
		 }

		 crc = __crc32_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);

		 tail = len & VMX_ALIGN_MASK;
		 if (tail) {
		 		 p += len & ~VMX_ALIGN_MASK;
		 		 crc = crc32_align(crc, p, tail);
		 }

out:
#ifdef CRC_XOR
		 crc ^= 0xffffffff;
#endif

		 return crc;
}

#endif /* __powerpc__ */