mirror of
https://github.com/claunia/findcrcs.git
synced 2025-12-16 10:44:25 +00:00
292 lines
8.0 KiB
C++
292 lines
8.0 KiB
C++
// Copyright 2010 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Implements multiword CRC for GCC on i386.
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//
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// Small comment: the trick described in
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// http://software.intel.com/en-us/articles/fast-simd-integer-move-for-the-intel-pentiumr-4-processor
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// (replace "movdqa dst, src" with "pshufd $0xE4, src, dst")
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// did not work: execution time increased from
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// 1.8 CPU cycles/byte to 2.1 CPU cycles/byte.
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// So it may be good idea on P4 but it's not on newer CPUs.
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//
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// movaps/xorps vs. movdqa/pxor did not make any difference.
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#include "generic_crc.h"
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#include "uint128_sse2.h"
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#if defined(__GNUC__) && CRCUTIL_USE_ASM && HAVE_AMD64 && HAVE_SSE2
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namespace crcutil {
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template<> uint128_sse2
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GenericCrc<uint128_sse2, uint128_sse2, uint64, 4>::CrcMultiwordGccAmd64Sse2(
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const uint8 *src, const uint8 *end, const uint128_sse2 &start) const;
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template<>
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uint128_sse2 GenericCrc<uint128_sse2, uint128_sse2, uint64, 4>::CrcMultiword(
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const void *data, size_t bytes, const uint128_sse2 &start) const {
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const uint8 *src = static_cast<const uint8 *>(data);
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uint128_sse2 crc = start ^ this->Base().Canonize();
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const uint8 *end = src + bytes;
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if (bytes <= 7) {
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for (; src < end; ++src) {
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CRC_BYTE(this, crc, *src);
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}
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return (crc ^ this->Base().Canonize());
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}
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ALIGN_ON_WORD_BOUNDARY_IF_NEEDED(bytes, this, src, end, crc, uint64);
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if (src >= end) {
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return (crc ^ this->Base().Canonize());
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}
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return CrcMultiwordGccAmd64Sse2(src, end, crc);
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}
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#define CRC_WORD_ASM() \
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SSE2_MOVQ " %[crc0], %[tmp0]\n" \
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"xorq %[tmp0], %[buf0]\n" \
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"psrldq $8, %[crc0]\n" \
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"movzbq %b[buf0], %[tmp0]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp0], %[tmp0]\n" \
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"pxor (%[table_word], %[tmp0], 8), %[crc0]\n" \
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"movzbq %b[buf0], %[tmp1]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp1], %[tmp1]\n" \
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"pxor 1*256*16(%[table_word], %[tmp1], 8), %[crc0]\n" \
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"movzbq %b[buf0], %[tmp0]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp0], %[tmp0]\n" \
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"pxor 2*256*16(%[table_word], %[tmp0], 8), %[crc0]\n" \
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"movzbq %b[buf0], %[tmp1]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp1], %[tmp1]\n" \
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"pxor 3*256*16(%[table_word], %[tmp1], 8), %[crc0]\n" \
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"movzbq %b[buf0], %[tmp0]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp0], %[tmp0]\n" \
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"pxor 4*256*16(%[table_word], %[tmp0], 8), %[crc0]\n" \
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"movzbq %b[buf0], %[tmp1]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp1], %[tmp1]\n" \
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"pxor 5*256*16(%[table_word], %[tmp1], 8), %[crc0]\n" \
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"movzbq %b[buf0], %[tmp0]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp0], %[tmp0]\n" \
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"pxor 6*256*16(%[table_word], %[tmp0], 8), %[crc0]\n" \
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"addq %[buf0], %[buf0]\n" \
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"pxor 7*256*16(%[table_word], %[buf0], 8), %[crc0]\n"
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template<> uint128_sse2
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GenericCrc<uint128_sse2, uint128_sse2, uint64, 4>::CrcMultiwordGccAmd64Sse2(
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const uint8 *src, const uint8 *end, const uint128_sse2 &start) const {
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__m128i crc0 = start;
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__m128i crc1;
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__m128i crc2;
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__m128i crc3;
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__m128i crc_carryover;
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uint64 buf0;
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uint64 buf1;
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uint64 buf2;
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uint64 buf3;
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uint64 tmp0;
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uint64 tmp1;
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asm(
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"sub $2*4*8 - 1, %[end]\n"
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"cmpq %[src], %[end]\n"
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"jbe 2f\n"
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"pxor %[crc1], %[crc1]\n"
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"pxor %[crc2], %[crc2]\n"
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"pxor %[crc3], %[crc3]\n"
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"pxor %[crc_carryover], %[crc_carryover]\n"
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"movq (%[src]), %[buf0]\n"
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"movq 1*8(%[src]), %[buf1]\n"
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"movq 2*8(%[src]), %[buf2]\n"
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"movq 3*8(%[src]), %[buf3]\n"
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"1:\n"
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#if HAVE_SSE && CRCUTIL_PREFETCH_WIDTH > 0
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"prefetcht0 " TO_STRING(CRCUTIL_PREFETCH_WIDTH) "(%[src])\n"
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#endif
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#if GCC_VERSION_AVAILABLE(4, 5)
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// Bug in GCC 4.2.4?
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"add $4*8, %[src]\n"
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#else
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"lea 4*8(%[src]), %[src]\n"
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#endif
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"pxor %[crc_carryover], %[crc0]\n"
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SSE2_MOVQ " %[crc0], %[tmp0]\n"
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"psrldq $8, %[crc0]\n"
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"xorq %[tmp0], %[buf0]\n"
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"movzbq %b[buf0], %[tmp0]\n"
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"pxor %[crc0], %[crc1]\n"
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"addq %[tmp0], %[tmp0]\n"
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"shrq $8, %[buf0]\n"
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"movdqa (%[table], %[tmp0], 8), %[crc0]\n"
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SSE2_MOVQ " %[crc1], %[tmp1]\n"
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"psrldq $8, %[crc1]\n"
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"xorq %[tmp1], %[buf1]\n"
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"movzbq %b[buf1], %[tmp1]\n"
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"pxor %[crc1], %[crc2]\n"
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"addq %[tmp1], %[tmp1]\n"
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"shrq $8, %[buf1]\n"
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"movdqa (%[table], %[tmp1], 8), %[crc1]\n"
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SSE2_MOVQ " %[crc2], %[tmp0]\n"
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"psrldq $8, %[crc2]\n"
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"xorq %[tmp0], %[buf2]\n"
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"movzbq %b[buf2], %[tmp0]\n"
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"pxor %[crc2], %[crc3]\n"
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"addq %[tmp0], %[tmp0]\n"
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"shrq $8, %[buf2]\n"
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"movdqa (%[table], %[tmp0], 8), %[crc2]\n"
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SSE2_MOVQ " %[crc3], %[tmp1]\n"
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"psrldq $8, %[crc3]\n"
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"xorq %[tmp1], %[buf3]\n"
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"movzbq %b[buf3], %[tmp1]\n"
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"movdqa %[crc3], %[crc_carryover]\n"
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"addq %[tmp1], %[tmp1]\n"
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"shrq $8, %[buf3]\n"
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"movdqa (%[table], %[tmp1], 8), %[crc3]\n"
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#define XOR(byte) \
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"movzbq %b[buf0], %[tmp0]\n" \
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"shrq $8, %[buf0]\n" \
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"addq %[tmp0], %[tmp0]\n" \
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"pxor " #byte "*256*16(%[table], %[tmp0], 8), %[crc0]\n" \
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"movzbq %b[buf1], %[tmp1]\n" \
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"shrq $8, %[buf1]\n" \
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"addq %[tmp1], %[tmp1]\n" \
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"pxor " #byte "*256*16(%[table], %[tmp1], 8), %[crc1]\n" \
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"movzbq %b[buf2], %[tmp0]\n" \
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"shrq $8, %[buf2]\n" \
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"addq %[tmp0], %[tmp0]\n" \
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"pxor " #byte "*256*16(%[table], %[tmp0], 8), %[crc2]\n" \
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"movzbq %b[buf3], %[tmp1]\n" \
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"shrq $8, %[buf3]\n" \
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"addq %[tmp1], %[tmp1]\n" \
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"pxor " #byte "*256*16(%[table], %[tmp1], 8), %[crc3]\n"
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XOR(1)
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XOR(2)
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XOR(3)
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XOR(4)
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XOR(5)
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XOR(6)
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#undef XOR
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"addq %[buf0], %[buf0]\n"
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"pxor 7*256*16(%[table], %[buf0], 8), %[crc0]\n"
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"movq (%[src]), %[buf0]\n"
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"addq %[buf1], %[buf1]\n"
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"pxor 7*256*16(%[table], %[buf1], 8), %[crc1]\n"
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"movq 1*8(%[src]), %[buf1]\n"
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"addq %[buf2], %[buf2]\n"
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"pxor 7*256*16(%[table], %[buf2], 8), %[crc2]\n"
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"movq 2*8(%[src]), %[buf2]\n"
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"addq %[buf3], %[buf3]\n"
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"pxor 7*256*16(%[table], %[buf3], 8), %[crc3]\n"
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"movq 3*8(%[src]), %[buf3]\n"
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"cmpq %[src], %[end]\n"
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"ja 1b\n"
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"pxor %[crc_carryover], %[crc0]\n"
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CRC_WORD_ASM()
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"pxor %[crc1], %[crc0]\n"
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"movq %[buf1], %[buf0]\n"
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CRC_WORD_ASM()
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"pxor %[crc2], %[crc0]\n"
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"movq %[buf2], %[buf0]\n"
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CRC_WORD_ASM()
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"pxor %[crc3], %[crc0]\n"
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"movq %[buf3], %[buf0]\n"
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CRC_WORD_ASM()
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"add $4*8, %[src]\n"
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"2:\n"
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"add $2*4*8 - 8, %[end]\n"
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"cmpq %[src], %[end]\n"
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"jbe 4f\n"
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"3:\n"
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"movq (%[src]), %[buf0]\n"
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"addq $8, %[src]\n"
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CRC_WORD_ASM()
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"cmpq %[src], %[end]\n"
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"ja 3b\n"
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"4:\n"
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"add $7, %[end]\n"
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"cmpq %[src], %[end]\n"
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"jbe 6f\n"
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"5:\n"
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"movzbq (%[src]), %[buf0]\n"
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"add $1, %[src]\n"
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SSE2_MOVQ " %[crc0], %[tmp0]\n"
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"movzx %b[tmp0], %[tmp0]\n"
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"psrldq $1, %[crc0]\n"
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"xor %[buf0], %[tmp0]\n"
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"addq %[tmp0], %[tmp0]\n"
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"pxor 7*256*16(%[table_word], %[tmp0], 8), %[crc0]\n"
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"cmpq %[src], %[end]\n"
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"ja 5b\n"
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"6:\n"
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: // outputs
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[src] "+r" (src),
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[end] "+r" (end),
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[crc0] "+x" (crc0),
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[crc1] "=&x" (crc1),
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[crc2] "=&x" (crc2),
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[crc3] "=&x" (crc3),
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[crc_carryover] "=&x" (crc_carryover),
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[buf0] "=&r" (buf0),
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[buf1] "=&r" (buf1),
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[buf2] "=&r" (buf2),
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[buf3] "=&r" (buf3),
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[tmp0] "=&r" (tmp0),
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[tmp1] "=&r" (tmp1)
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: // inputs
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[table_word] "r" (this->crc_word_),
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[table] "r" (this->crc_word_interleaved_));
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return (this->Base().Canonize() ^ crc0);
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}
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} // namespace crcutil
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#endif // defined(__GNUC__) && CRCUTIL_USE_ASM && HAVE_AMD64 && HAVE_SSE2
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