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62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*
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* crc32_vec_template.h - template for vectorized CRC-32 implementations
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*
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* Copyright 2016 Eric Biggers
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#define CRC32_SLICE1 1
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static u32 crc32_slice1(u32, const u8 *, size_t);
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/*
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* Template for vectorized CRC-32 implementations.
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*
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* Note: on unaligned ends of the buffer, we fall back to crc32_slice1() instead
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* of crc32_slice8() because only a few bytes need to be processed, so a smaller
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* table is preferable.
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*/
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static u32 ATTRIBUTES
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FUNCNAME(u32 remainder, const u8 *p, size_t size)
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{
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if ((uintptr_t)p % IMPL_ALIGNMENT) {
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size_t n = MIN(size, -(uintptr_t)p % IMPL_ALIGNMENT);
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remainder = crc32_slice1(remainder, p, n);
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p += n;
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size -= n;
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}
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if (size >= IMPL_SEGMENT_SIZE) {
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remainder = FUNCNAME_ALIGNED(remainder, (const void *)p,
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size / IMPL_SEGMENT_SIZE);
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p += size - (size % IMPL_SEGMENT_SIZE);
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size %= IMPL_SEGMENT_SIZE;
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}
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return crc32_slice1(remainder, p, size);
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}
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#undef FUNCNAME
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#undef FUNCNAME_ALIGNED
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#undef ATTRIBUTES
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#undef IMPL_ALIGNMENT
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#undef IMPL_SEGMENT_SIZE
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