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// Copyright 2010 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Implements 64-bit multiword CRC using MMX built-in functions.
#include "generic_crc.h"
#if CRCUTIL_USE_ASM && HAVE_I386 && HAVE_MMX
namespace crcutil {
template<> uint64 GenericCrc<uint64, uint64, uint64, 4>::CrcMultiwordI386Mmx(
const void *data, size_t bytes, const uint64 &start)
const GCC_OMIT_FRAME_POINTER;
#if !defined(_MSC_VER)
template<> uint64 GenericCrc<uint64, uint64, uint64, 4>::CrcMultiword(
const void *data,
size_t bytes,
const uint64 &start) const {
if (bytes <= 7) {
const uint8 *src = static_cast<const uint8 *>(data);
uint64 crc = start ^ Base().Canonize();
for (const uint8 *end = src + bytes; src < end; ++src) {
CRC_BYTE(this, crc, *src);
}
return (crc ^ Base().Canonize());
}
return CrcMultiwordI386Mmx(data, bytes, start);
}
#else
#pragma warning(push)
// CL: uninitialized local variable 'crc1' used
// Wrong: crc1 = XOR(crc1, crc1) sets it to 0.
#pragma warning(disable: 4700)
#pragma warning(disable: 4619) // there is no warning number '592'
// ICL: variable "crc1" is used before its value is set
// Wrong: crc1 = XOR(crc1, crc1) sets it to 0.
#pragma warning(disable: 592)
#endif // !defined(_MSC_VER)
#define MM64(adr) reinterpret_cast<const __m64 *>(adr)
#define MM64_TABLE(byte) MM64(crc_word_interleaved_[byte])
#define CRC_WORD_MMX(this, crc, buf) do { \
buf = _mm_xor_si64(buf, crc); \
uint32 tmp = static_cast<uint32>(_mm_cvtsi64_si32(buf)); \
buf = _mm_srli_si64(buf, 32); \
crc = MM64(crc_word_[0])[TO_BYTE(tmp)]; \
tmp >>= 8; \
crc = _mm_xor_si64(crc, MM64(crc_word_[1])[TO_BYTE(tmp)]); \
tmp >>= 8; \
crc = _mm_xor_si64(crc, MM64(crc_word_[2])[TO_BYTE(tmp)]); \
tmp >>= 8; \
crc = _mm_xor_si64(crc, MM64(crc_word_[3])[tmp]); \
tmp = static_cast<uint32>(_mm_cvtsi64_si32(buf)); \
crc = _mm_xor_si64(crc, MM64(crc_word_[4])[TO_BYTE(tmp)]); \
tmp >>= 8; \
crc = _mm_xor_si64(crc, MM64(crc_word_[5])[TO_BYTE(tmp)]); \
tmp >>= 8; \
crc = _mm_xor_si64(crc, MM64(crc_word_[6])[TO_BYTE(tmp)]); \
tmp >>= 8; \
crc = _mm_xor_si64(crc, MM64(crc_word_[7])[tmp]); \
} while (0)
template<> uint64 GenericCrc<uint64, uint64, uint64, 4>::CrcMultiwordI386Mmx(
const void *data, size_t bytes, const uint64 &start) const {
const uint8 *src = static_cast<const uint8 *>(data);
const uint8 *end = src + bytes;
uint64 crc = start ^ Base().Canonize();
ALIGN_ON_WORD_BOUNDARY_IF_NEEDED(bytes, this, src, end, crc, uint64);
if (src >= end) {
return (crc ^ Base().Canonize());
}
// Process 4 registers of sizeof(uint64) bytes at once.
bytes = static_cast<size_t>(end - src) & ~(4*8 - 1);
if (bytes > 4*8) {
const uint8 *stop = src + bytes - 4*8;
union {
__m64 m64;
uint64 u64;
} temp;
__m64 crc0;
__m64 crc1;
__m64 crc2;
__m64 crc3;
__m64 buf0 = MM64(src)[0];
__m64 buf1 = MM64(src)[1];
__m64 buf2 = MM64(src)[2];
__m64 buf3 = MM64(src)[3];
temp.u64 = crc;
crc0 = temp.m64;
#if defined(__GNUC__) && !GCC_VERSION_AVAILABLE(4, 4)
// There is no way to suppress a warning in GCC;
// generate extra assignments.
temp.u64 = 0;
crc1 = temp.m64;
crc2 = temp.m64;
crc3 = temp.m64;
#else
crc1 = _mm_xor_si64(crc1, crc1);
crc2 = _mm_xor_si64(crc2, crc2);
crc3 = _mm_xor_si64(crc3, crc3);
#endif // defined(__GNUC__) && !GCC_VERSION_AVAILABLE(4, 4)
do {
PREFETCH(src);
src += 4*8;
buf0 = _mm_xor_si64(buf0, crc0);
buf1 = _mm_xor_si64(buf1, crc1);
buf2 = _mm_xor_si64(buf2, crc2);
buf3 = _mm_xor_si64(buf3, crc3);
uint32 tmp0 = static_cast<uint32>(_mm_cvtsi64_si32(buf0));
uint32 tmp1 = static_cast<uint32>(_mm_cvtsi64_si32(buf1));
uint32 tmp2 = static_cast<uint32>(_mm_cvtsi64_si32(buf2));
uint32 tmp3 = static_cast<uint32>(_mm_cvtsi64_si32(buf3));
buf0 = _mm_srli_si64(buf0, 32);
buf1 = _mm_srli_si64(buf1, 32);
buf2 = _mm_srli_si64(buf2, 32);
buf3 = _mm_srli_si64(buf3, 32);
crc0 = MM64_TABLE(0)[TO_BYTE(tmp0)];
tmp0 >>= 8;
crc1 = MM64_TABLE(0)[TO_BYTE(tmp1)];
tmp1 >>= 8;
crc2 = MM64_TABLE(0)[TO_BYTE(tmp2)];
tmp2 >>= 8;
crc3 = MM64_TABLE(0)[TO_BYTE(tmp3)];
tmp3 >>= 8;
#define XOR(byte) do { \
crc0 = _mm_xor_si64(crc0, MM64_TABLE(byte)[TO_BYTE(tmp0)]); \
tmp0 >>= 8; \
crc1 = _mm_xor_si64(crc1, MM64_TABLE(byte)[TO_BYTE(tmp1)]); \
tmp1 >>= 8; \
crc2 = _mm_xor_si64(crc2, MM64_TABLE(byte)[TO_BYTE(tmp2)]); \
tmp2 >>= 8; \
crc3 = _mm_xor_si64(crc3, MM64_TABLE(byte)[TO_BYTE(tmp3)]); \
tmp3 >>= 8; \
} while (0)
XOR(1);
XOR(2);
crc0 = _mm_xor_si64(crc0, MM64_TABLE(3)[tmp0]);
tmp0 = static_cast<uint32>(_mm_cvtsi64_si32(buf0));
crc1 = _mm_xor_si64(crc1, MM64_TABLE(3)[tmp1]);
tmp1 = static_cast<uint32>(_mm_cvtsi64_si32(buf1));
crc2 = _mm_xor_si64(crc2, MM64_TABLE(3)[tmp2]);
tmp2 = static_cast<uint32>(_mm_cvtsi64_si32(buf2));
crc3 = _mm_xor_si64(crc3, MM64_TABLE(3)[tmp3]);
tmp3 = static_cast<uint32>(_mm_cvtsi64_si32(buf3));
XOR(4);
XOR(5);
XOR(6);
#undef XOR
crc0 = _mm_xor_si64(crc0, MM64_TABLE(sizeof(uint64) - 1)[tmp0]);
buf0 = MM64(src)[0];
crc1 = _mm_xor_si64(crc1, MM64_TABLE(sizeof(uint64) - 1)[tmp1]);
buf1 = MM64(src)[1];
crc2 = _mm_xor_si64(crc2, MM64_TABLE(sizeof(uint64) - 1)[tmp2]);
buf2 = MM64(src)[2];
crc3 = _mm_xor_si64(crc3, MM64_TABLE(sizeof(uint64) - 1)[tmp3]);
buf3 = MM64(src)[3];
}
while (src < stop);
CRC_WORD_MMX(this, crc0, buf0);
buf1 = _mm_xor_si64(buf1, crc1);
CRC_WORD_MMX(this, crc0, buf1);
buf2 = _mm_xor_si64(buf2, crc2);
CRC_WORD_MMX(this, crc0, buf2);
buf3 = _mm_xor_si64(buf3, crc3);
CRC_WORD_MMX(this, crc0, buf3);
temp.m64 = crc0;
crc = temp.u64;
_mm_empty();
src += 4*8;
}
// Process sizeof(uint64) bytes at once.
bytes = static_cast<size_t>(end - src) & ~(sizeof(uint64) - 1);
if (bytes > 0) {
union {
__m64 m64;
uint64 u64;
} temp;
__m64 crc0;
temp.u64 = crc;
crc0 = temp.m64;
for (const uint8 *stop = src + bytes; src < stop; src += sizeof(uint64)) {
__m64 buf0 = MM64(src)[0];
CRC_WORD_MMX(this, crc0, buf0);
}
temp.m64 = crc0;
crc = temp.u64;
_mm_empty();
}
// Compute CRC of remaining bytes.
for (;src < end; ++src) {
CRC_BYTE(this, crc, *src);
}
return (crc ^ Base().Canonize());
}
#if defined(_MSC_VER)
#pragma warning(pop)
#endif // defined(_MSC_VER)
} // namespace crcutil
#endif // CRCUTIL_USE_ASM && HAVE_I386 && HAVE_MMX
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