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78 lines
1.9 KiB
78 lines
1.9 KiB
/* crc32_acle.c -- compute the CRC-32 of a data stream |
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* Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler |
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* Copyright (C) 2016 Yang Zhang |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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* |
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*/ |
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#ifdef ARM_ACLE |
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#include "acle_intrins.h" |
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#include "../../zbuild.h" |
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Z_INTERNAL Z_TARGET_CRC uint32_t crc32_acle(uint32_t crc, const uint8_t *buf, size_t len) { |
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Z_REGISTER uint32_t c; |
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Z_REGISTER const uint16_t *buf2; |
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Z_REGISTER const uint32_t *buf4; |
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Z_REGISTER const uint64_t *buf8; |
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c = ~crc; |
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if (UNLIKELY(len == 1)) { |
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c = __crc32b(c, *buf); |
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c = ~c; |
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return c; |
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} |
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if ((ptrdiff_t)buf & (sizeof(uint64_t) - 1)) { |
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if (len && ((ptrdiff_t)buf & 1)) { |
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c = __crc32b(c, *buf++); |
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len--; |
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} |
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if ((len >= sizeof(uint16_t)) && ((ptrdiff_t)buf & sizeof(uint16_t))) { |
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buf2 = (const uint16_t *) buf; |
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c = __crc32h(c, *buf2++); |
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len -= sizeof(uint16_t); |
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buf4 = (const uint32_t *) buf2; |
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} else { |
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buf4 = (const uint32_t *) buf; |
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} |
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if ((len >= sizeof(uint32_t)) && ((ptrdiff_t)buf & sizeof(uint32_t))) { |
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c = __crc32w(c, *buf4++); |
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len -= sizeof(uint32_t); |
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} |
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buf8 = (const uint64_t *) buf4; |
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} else { |
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buf8 = (const uint64_t *) buf; |
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} |
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while (len >= sizeof(uint64_t)) { |
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c = __crc32d(c, *buf8++); |
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len -= sizeof(uint64_t); |
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} |
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if (len >= sizeof(uint32_t)) { |
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buf4 = (const uint32_t *) buf8; |
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c = __crc32w(c, *buf4++); |
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len -= sizeof(uint32_t); |
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buf2 = (const uint16_t *) buf4; |
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} else { |
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buf2 = (const uint16_t *) buf8; |
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} |
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if (len >= sizeof(uint16_t)) { |
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c = __crc32h(c, *buf2++); |
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len -= sizeof(uint16_t); |
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} |
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buf = (const unsigned char *) buf2; |
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if (len) { |
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c = __crc32b(c, *buf); |
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} |
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c = ~c; |
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return c; |
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} |
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#endif
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