480 lines
16 KiB
C
480 lines
16 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=4 sts=4 sw=4 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2013 Intel Corporation │
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│ Use of this source code is governed by the BSD-style licenses that can │
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│ be found in the third_party/zlib/LICENSE file. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/emmintrin.h"
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#include "libc/bits/smmintrin.h"
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#include "libc/bits/tmmintrin.h"
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#include "libc/bits/wmmintrin.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "third_party/zlib/deflate.h"
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#include "third_party/zlib/internal.h"
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asm(".ident\t\"\\n\\n\
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zlib » crc32 parallelized folding (zlib License)\\n\
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Copyright 2013 Intel Corporation\\n\
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Authors: Wajdi Feghali,Jim Guilford,Vinodh Gopal,Erdinc Ozturk,Jim Kukunas\"");
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asm(".include \"libc/disclaimer.inc\"");
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/**
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* CRC32 parallelized folding w/ PCLMULQDQ instruction.
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*
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* Authored by:
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* Wajdi Feghali <wajdi.k.feghali@intel.com>
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* Jim Guilford <james.guilford@intel.com>
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* Vinodh Gopal <vinodh.gopal@intel.com>
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* Erdinc Ozturk <erdinc.ozturk@intel.com>
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* Jim Kukunas <james.t.kukunas@linux.intel.com>
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*
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#define CRC_LOAD(s) \
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__m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0); \
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__m128i xmm_crc1 = _mm_loadu_si128((__m128i *)s->crc0 + 1); \
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__m128i xmm_crc2 = _mm_loadu_si128((__m128i *)s->crc0 + 2); \
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__m128i xmm_crc3 = _mm_loadu_si128((__m128i *)s->crc0 + 3); \
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__m128i xmm_crc_part = _mm_loadu_si128((__m128i *)s->crc0 + 4)
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#define CRC_SAVE(s) \
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_mm_storeu_si128((__m128i *)s->crc0 + 0, xmm_crc0); \
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_mm_storeu_si128((__m128i *)s->crc0 + 1, xmm_crc1); \
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_mm_storeu_si128((__m128i *)s->crc0 + 2, xmm_crc2); \
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_mm_storeu_si128((__m128i *)s->crc0 + 3, xmm_crc3); \
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_mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part)
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void crc_fold_init(struct DeflateState *const s) {
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CRC_LOAD(s);
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xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
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xmm_crc1 = _mm_setzero_si128();
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xmm_crc2 = _mm_setzero_si128();
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xmm_crc3 = _mm_setzero_si128();
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CRC_SAVE(s);
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s->strm->adler = 0;
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}
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static inline void fold_1(struct DeflateState *const s, __m128i *xmm_crc0,
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__m128i *xmm_crc1, __m128i *xmm_crc2,
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__m128i *xmm_crc3) {
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const __m128i xmm_fold4 =
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_mm_set_epi32(0x00000001, 0x54442bd4, 0x00000001, 0xc6e41596);
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__m128i x_tmp3;
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__m128 ps_crc0, ps_crc3, ps_res;
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x_tmp3 = *xmm_crc3;
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*xmm_crc3 = *xmm_crc0;
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*xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
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*xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
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ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
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ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
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ps_res = _mm_xor_ps(ps_crc0, ps_crc3);
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*xmm_crc0 = *xmm_crc1;
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*xmm_crc1 = *xmm_crc2;
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*xmm_crc2 = x_tmp3;
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*xmm_crc3 = _mm_castps_si128(ps_res);
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}
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static inline void fold_2(struct DeflateState *const s, __m128i *xmm_crc0,
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__m128i *xmm_crc1, __m128i *xmm_crc2,
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__m128i *xmm_crc3) {
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const __m128i xmm_fold4 =
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_mm_set_epi32(0x00000001, 0x54442bd4, 0x00000001, 0xc6e41596);
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__m128i x_tmp3, x_tmp2;
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__m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res31, ps_res20;
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x_tmp3 = *xmm_crc3;
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x_tmp2 = *xmm_crc2;
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*xmm_crc3 = *xmm_crc1;
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*xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
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*xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
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ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
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ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
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ps_res31 = _mm_xor_ps(ps_crc3, ps_crc1);
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*xmm_crc2 = *xmm_crc0;
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*xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
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*xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
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ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
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ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
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ps_res20 = _mm_xor_ps(ps_crc0, ps_crc2);
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*xmm_crc0 = x_tmp2;
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*xmm_crc1 = x_tmp3;
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*xmm_crc2 = _mm_castps_si128(ps_res20);
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*xmm_crc3 = _mm_castps_si128(ps_res31);
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}
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static inline void fold_3(struct DeflateState *const s, __m128i *xmm_crc0,
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__m128i *xmm_crc1, __m128i *xmm_crc2,
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__m128i *xmm_crc3) {
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const __m128i xmm_fold4 =
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_mm_set_epi32(0x00000001, 0x54442bd4, 0x00000001, 0xc6e41596);
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__m128i x_tmp3;
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__m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res32, ps_res21, ps_res10;
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x_tmp3 = *xmm_crc3;
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*xmm_crc3 = *xmm_crc2;
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*xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
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*xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
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ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
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ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
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ps_res32 = _mm_xor_ps(ps_crc2, ps_crc3);
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*xmm_crc2 = *xmm_crc1;
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*xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
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*xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
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ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
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ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
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ps_res21 = _mm_xor_ps(ps_crc1, ps_crc2);
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*xmm_crc1 = *xmm_crc0;
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*xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
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*xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x10);
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ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
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ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
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ps_res10 = _mm_xor_ps(ps_crc0, ps_crc1);
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*xmm_crc0 = x_tmp3;
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*xmm_crc1 = _mm_castps_si128(ps_res10);
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*xmm_crc2 = _mm_castps_si128(ps_res21);
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*xmm_crc3 = _mm_castps_si128(ps_res32);
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}
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static inline void fold_4(struct DeflateState *const s, __m128i *xmm_crc0,
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__m128i *xmm_crc1, __m128i *xmm_crc2,
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__m128i *xmm_crc3) {
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const __m128i xmm_fold4 =
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_mm_set_epi32(0x00000001, 0x54442bd4, 0x00000001, 0xc6e41596);
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__m128i x_tmp0, x_tmp1, x_tmp2, x_tmp3;
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__m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3;
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__m128 ps_t0, ps_t1, ps_t2, ps_t3;
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__m128 ps_res0, ps_res1, ps_res2, ps_res3;
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x_tmp0 = *xmm_crc0;
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x_tmp1 = *xmm_crc1;
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x_tmp2 = *xmm_crc2;
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x_tmp3 = *xmm_crc3;
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*xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
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x_tmp0 = _mm_clmulepi64_si128(x_tmp0, xmm_fold4, 0x10);
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ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
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ps_t0 = _mm_castsi128_ps(x_tmp0);
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ps_res0 = _mm_xor_ps(ps_crc0, ps_t0);
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*xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
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x_tmp1 = _mm_clmulepi64_si128(x_tmp1, xmm_fold4, 0x10);
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ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
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ps_t1 = _mm_castsi128_ps(x_tmp1);
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ps_res1 = _mm_xor_ps(ps_crc1, ps_t1);
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*xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
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x_tmp2 = _mm_clmulepi64_si128(x_tmp2, xmm_fold4, 0x10);
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ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
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ps_t2 = _mm_castsi128_ps(x_tmp2);
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ps_res2 = _mm_xor_ps(ps_crc2, ps_t2);
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*xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x01);
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x_tmp3 = _mm_clmulepi64_si128(x_tmp3, xmm_fold4, 0x10);
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ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
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ps_t3 = _mm_castsi128_ps(x_tmp3);
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ps_res3 = _mm_xor_ps(ps_crc3, ps_t3);
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*xmm_crc0 = _mm_castps_si128(ps_res0);
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*xmm_crc1 = _mm_castps_si128(ps_res1);
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*xmm_crc2 = _mm_castps_si128(ps_res2);
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*xmm_crc3 = _mm_castps_si128(ps_res3);
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}
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static const unsigned aligned(32) pshufb_shf_table[60] = {
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0x84838281, 0x88878685, 0x8c8b8a89, 0x008f8e8d, /* shl 15 (16 - 1)/shr1 */
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0x85848382, 0x89888786, 0x8d8c8b8a, 0x01008f8e, /* shl 14 (16 - 3)/shr2 */
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0x86858483, 0x8a898887, 0x8e8d8c8b, 0x0201008f, /* shl 13 (16 - 4)/shr3 */
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0x87868584, 0x8b8a8988, 0x8f8e8d8c, 0x03020100, /* shl 12 (16 - 4)/shr4 */
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0x88878685, 0x8c8b8a89, 0x008f8e8d, 0x04030201, /* shl 11 (16 - 5)/shr5 */
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0x89888786, 0x8d8c8b8a, 0x01008f8e, 0x05040302, /* shl 10 (16 - 6)/shr6 */
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0x8a898887, 0x8e8d8c8b, 0x0201008f, 0x06050403, /* shl 9 (16 - 7)/shr7 */
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0x8b8a8988, 0x8f8e8d8c, 0x03020100, 0x07060504, /* shl 8 (16 - 8)/shr8 */
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0x8c8b8a89, 0x008f8e8d, 0x04030201, 0x08070605, /* shl 7 (16 - 9)/shr9 */
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0x8d8c8b8a, 0x01008f8e, 0x05040302, 0x09080706, /* shl 6 (16 -10)/shr10*/
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0x8e8d8c8b, 0x0201008f, 0x06050403, 0x0a090807, /* shl 5 (16 -11)/shr11*/
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0x8f8e8d8c, 0x03020100, 0x07060504, 0x0b0a0908, /* shl 4 (16 -12)/shr12*/
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0x008f8e8d, 0x04030201, 0x08070605, 0x0c0b0a09, /* shl 3 (16 -13)/shr13*/
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0x01008f8e, 0x05040302, 0x09080706, 0x0d0c0b0a, /* shl 2 (16 -14)/shr14*/
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0x0201008f, 0x06050403, 0x0a090807, 0x0e0d0c0b /* shl 1 (16 -15)/shr15*/
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};
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static void partial_fold(struct DeflateState *const s, const size_t len,
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__m128i *xmm_crc0, __m128i *xmm_crc1,
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__m128i *xmm_crc2, __m128i *xmm_crc3,
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__m128i *xmm_crc_part) {
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const __m128i xmm_fold4 =
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_mm_set_epi32(0x00000001, 0x54442bd4, 0x00000001, 0xc6e41596);
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const __m128i xmm_mask3 = _mm_set1_epi32(0x80808080);
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__m128i xmm_shl, xmm_shr, xmm_tmp1, xmm_tmp2, xmm_tmp3;
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__m128i xmm_a0_0, xmm_a0_1;
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__m128 ps_crc3, psa0_0, psa0_1, ps_res;
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{
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__m128i *wut = (__m128i *)pshufb_shf_table + (len - 1);
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intptr_t huh = (intptr_t)wut;
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intptr_t tab = (intptr_t)pshufb_shf_table;
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if (huh < tab || huh + sizeof(*wut) >= tab + sizeof(pshufb_shf_table)) {
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abort();
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}
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xmm_shl = _mm_load_si128(wut);
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}
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xmm_shr = xmm_shl;
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xmm_shr = _mm_xor_si128(xmm_shr, xmm_mask3);
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xmm_a0_0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shl);
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*xmm_crc0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shr);
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xmm_tmp1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shl);
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*xmm_crc0 = _mm_or_si128(*xmm_crc0, xmm_tmp1);
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*xmm_crc1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shr);
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xmm_tmp2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shl);
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*xmm_crc1 = _mm_or_si128(*xmm_crc1, xmm_tmp2);
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*xmm_crc2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shr);
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xmm_tmp3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shl);
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*xmm_crc2 = _mm_or_si128(*xmm_crc2, xmm_tmp3);
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*xmm_crc3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shr);
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*xmm_crc_part = _mm_shuffle_epi8(*xmm_crc_part, xmm_shl);
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*xmm_crc3 = _mm_or_si128(*xmm_crc3, *xmm_crc_part);
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xmm_a0_1 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x10);
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xmm_a0_0 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x01);
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ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
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psa0_0 = _mm_castsi128_ps(xmm_a0_0);
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psa0_1 = _mm_castsi128_ps(xmm_a0_1);
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ps_res = _mm_xor_ps(ps_crc3, psa0_0);
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ps_res = _mm_xor_ps(ps_res, psa0_1);
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*xmm_crc3 = _mm_castps_si128(ps_res);
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}
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void crc_fold_copy(struct DeflateState *const s, unsigned char *dst,
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const unsigned char *src, long len) {
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unsigned long algn_diff;
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__m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;
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CRC_LOAD(s);
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if (len < 16) {
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if (len == 0) return;
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goto partial;
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}
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algn_diff = 0 - ((uintptr_t)src & 0xF);
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if (algn_diff) {
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xmm_crc_part = _mm_loadu_si128((__m128i *)src);
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_mm_storeu_si128((__m128i *)dst, xmm_crc_part);
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dst += algn_diff;
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src += algn_diff;
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len -= algn_diff;
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partial_fold(s, algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
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&xmm_crc_part);
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}
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while ((len -= 64) >= 0) {
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xmm_t0 = _mm_load_si128((__m128i *)src);
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xmm_t1 = _mm_load_si128((__m128i *)src + 1);
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xmm_t2 = _mm_load_si128((__m128i *)src + 2);
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xmm_t3 = _mm_load_si128((__m128i *)src + 3);
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fold_4(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
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_mm_storeu_si128((__m128i *)dst, xmm_t0);
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_mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
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_mm_storeu_si128((__m128i *)dst + 2, xmm_t2);
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_mm_storeu_si128((__m128i *)dst + 3, xmm_t3);
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xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0);
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xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1);
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xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2);
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xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3);
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src += 64;
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dst += 64;
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}
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/*
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* len = num bytes left - 64
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*/
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if (len + 16 >= 0) {
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len += 16;
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xmm_t0 = _mm_load_si128((__m128i *)src);
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xmm_t1 = _mm_load_si128((__m128i *)src + 1);
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xmm_t2 = _mm_load_si128((__m128i *)src + 2);
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fold_3(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
|
|
|
|
_mm_storeu_si128((__m128i *)dst, xmm_t0);
|
|
_mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
|
|
_mm_storeu_si128((__m128i *)dst + 2, xmm_t2);
|
|
|
|
xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t0);
|
|
xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t1);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t2);
|
|
|
|
if (len == 0) goto done;
|
|
|
|
dst += 48;
|
|
src += 48;
|
|
} else if (len + 32 >= 0) {
|
|
len += 32;
|
|
|
|
xmm_t0 = _mm_load_si128((__m128i *)src);
|
|
xmm_t1 = _mm_load_si128((__m128i *)src + 1);
|
|
|
|
fold_2(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
|
|
|
|
_mm_storeu_si128((__m128i *)dst, xmm_t0);
|
|
_mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
|
|
|
|
xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1);
|
|
|
|
if (len == 0) goto done;
|
|
|
|
dst += 32;
|
|
src += 32;
|
|
} else if (len + 48 >= 0) {
|
|
len += 48;
|
|
|
|
xmm_t0 = _mm_load_si128((__m128i *)src);
|
|
|
|
fold_1(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
|
|
|
|
_mm_storeu_si128((__m128i *)dst, xmm_t0);
|
|
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);
|
|
|
|
if (len == 0) goto done;
|
|
|
|
dst += 16;
|
|
src += 16;
|
|
} else {
|
|
len += 64;
|
|
if (len == 0) goto done;
|
|
}
|
|
|
|
partial:
|
|
|
|
#if defined(_MSC_VER)
|
|
/* VS does not permit the use of _mm_set_epi64x in 32-bit builds */
|
|
{
|
|
int32_t parts[4] = {0, 0, 0, 0};
|
|
memcpy(&parts, src, len);
|
|
xmm_crc_part = _mm_set_epi32(parts[3], parts[2], parts[1], parts[0]);
|
|
}
|
|
#else
|
|
{
|
|
int64_t parts[2] = {0, 0};
|
|
memcpy(&parts, src, len);
|
|
xmm_crc_part = _mm_set_epi64x(parts[1], parts[0]);
|
|
}
|
|
#endif
|
|
|
|
_mm_storeu_si128((__m128i *)dst, xmm_crc_part);
|
|
partial_fold(s, len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
|
|
&xmm_crc_part);
|
|
done:
|
|
CRC_SAVE(s);
|
|
}
|
|
|
|
static const __m128i kCrcFold512[] = {
|
|
{0xffffffffffffffffull, 0x0000000000000000ull},
|
|
{0xffffffff00000000ull, 0xffffffffffffffffull},
|
|
{0x00000000ccaa009eull, 0x00000001751997d0ull}, /* 2: k1 */
|
|
{0x00000000ccaa009eull, 0x0000000163cd6124ull}, /* 3: k5 */
|
|
{0x00000001f7011640ull, 0x00000001db710640ull} /* 4: k7 */
|
|
};
|
|
|
|
unsigned crc_fold_512to32(struct DeflateState *const s) {
|
|
const __m128i xmm_mask = kCrcFold512[0];
|
|
const __m128i xmm_mask2 = kCrcFold512[1];
|
|
|
|
unsigned crc;
|
|
__m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;
|
|
|
|
CRC_LOAD(s);
|
|
|
|
/*
|
|
* k1
|
|
*/
|
|
crc_fold = kCrcFold512[2];
|
|
|
|
x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10);
|
|
xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01);
|
|
xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0);
|
|
xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0);
|
|
|
|
x_tmp1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x10);
|
|
xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x01);
|
|
xmm_crc2 = _mm_xor_si128(xmm_crc2, x_tmp1);
|
|
xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_crc1);
|
|
|
|
x_tmp2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x10);
|
|
xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x01);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, x_tmp2);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
|
|
|
|
/*
|
|
* k5
|
|
*/
|
|
crc_fold = kCrcFold512[3];
|
|
|
|
xmm_crc0 = xmm_crc3;
|
|
xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
|
|
xmm_crc0 = _mm_srli_si128(xmm_crc0, 8);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
|
|
|
|
xmm_crc0 = xmm_crc3;
|
|
xmm_crc3 = _mm_slli_si128(xmm_crc3, 4);
|
|
xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
|
|
xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask2);
|
|
|
|
/*
|
|
* k7
|
|
*/
|
|
xmm_crc1 = xmm_crc3;
|
|
xmm_crc2 = xmm_crc3;
|
|
crc_fold = kCrcFold512[4];
|
|
|
|
xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
|
|
xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask);
|
|
|
|
xmm_crc2 = xmm_crc3;
|
|
xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
|
|
xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc1);
|
|
|
|
crc = _mm_extract_epi32(xmm_crc3, 2);
|
|
return ~crc;
|
|
CRC_SAVE(s); /* TODO(jart): wut? */
|
|
}
|