lib/zlib/crc32.c

7  * Kadatch and Jenkins (2010). See doc/crc-doc.1.0.pdf in this distribution.
15   of the crc tables. Therefore, if you #define DYNAMIC_CRC_TABLE, you should
562  * -march=armv8-a+crc, or -march=native if the compile machine has the crc32
575 unsigned long ZEXPORT crc32_z(unsigned long crc, const unsigned char FAR *buf,
592     crc = (~crc) & 0xffffffff;
598         __asm__ volatile("crc32b %w0, %w0, %w1" : "+r"(crc) : "r"(val));
616             __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc) : "r"(val0));
622         crc = multmodp(Z_BATCH_ZEROS, crc) ^ crc1;
623         crc = multmodp(Z_BATCH_ZEROS, crc) ^ crc2;
637             __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc) : "r"(val0));
644         crc = multmodp(val, crc) ^ crc1;
645         crc = multmodp(val, crc) ^ crc2;
651         __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc) : "r"(val0));
660         __asm__ volatile("crc32b %w0, %w0, %w1" : "+r"(crc) : "r"(val));
664     return crc ^ 0xffffffff;
694 unsigned long ZEXPORT crc32_z(unsigned long crc, const unsigned char FAR *buf,
704     crc = (~crc) & 0xffffffff;
718             crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
758             crc0 = crc;
841             crc = crc_word(crc0 ^ words[0]);
843             crc = crc_word(crc1 ^ words[1] ^ crc);
845             crc = crc_word(crc2 ^ words[2] ^ crc);
847             crc = crc_word(crc3 ^ words[3] ^ crc);
849             crc = crc_word(crc4 ^ words[4] ^ crc);
851             crc = crc_word(crc5 ^ words[5] ^ crc);
880             crc0 = byte_swap(crc);
980             crc = byte_swap(comb);
994         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
995         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
996         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
997         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
998         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
999         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
1000         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
1001         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
1005         crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
1009     return crc ^ 0xffffffff;
1015 unsigned long ZEXPORT crc32(unsigned long crc, const unsigned char FAR *buf,
1017     return crc32_z(crc, buf, len);