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Unified Diff: third_party/zlib/crc_folding.c

Issue 671163003: Revert of Integrate SIMD optimisations for zlib (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 2 months ago
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Index: third_party/zlib/crc_folding.c
diff --git a/third_party/zlib/crc_folding.c b/third_party/zlib/crc_folding.c
deleted file mode 100644
index 8558f2aaa56e0182978e5024b6fa940c04b41e61..0000000000000000000000000000000000000000
--- a/third_party/zlib/crc_folding.c
+++ /dev/null
@@ -1,478 +0,0 @@
-/*
- * Compute the CRC32 using a parallelized folding approach with the PCLMULQDQ
- * instruction.
- *
- * A white paper describing this algorithm can be found at:
- * http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf
- *
- * Copyright (C) 2013 Intel Corporation. All rights reserved.
- * Authors:
- * Wajdi Feghali <wajdi.k.feghali@intel.com>
- * Jim Guilford <james.guilford@intel.com>
- * Vinodh Gopal <vinodh.gopal@intel.com>
- * Erdinc Ozturk <erdinc.ozturk@intel.com>
- * Jim Kukunas <james.t.kukunas@linux.intel.com>
- *
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "deflate.h"
-
-#include <inttypes.h>
-#include <immintrin.h>
-#include <wmmintrin.h>
-
-#define CRC_LOAD(s) \
- do { \
- __m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0);\
- __m128i xmm_crc1 = _mm_loadu_si128((__m128i *)s->crc0 + 1);\
- __m128i xmm_crc2 = _mm_loadu_si128((__m128i *)s->crc0 + 2);\
- __m128i xmm_crc3 = _mm_loadu_si128((__m128i *)s->crc0 + 3);\
- __m128i xmm_crc_part = _mm_loadu_si128((__m128i *)s->crc0 + 4);
-
-#define CRC_SAVE(s) \
- _mm_storeu_si128((__m128i *)s->crc0 + 0, xmm_crc0);\
- _mm_storeu_si128((__m128i *)s->crc0 + 1, xmm_crc1);\
- _mm_storeu_si128((__m128i *)s->crc0 + 2, xmm_crc2);\
- _mm_storeu_si128((__m128i *)s->crc0 + 3, xmm_crc3);\
- _mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part);\
- } while (0);
-
-ZLIB_INTERNAL void crc_fold_init(deflate_state *const s)
-{
- CRC_LOAD(s)
-
- xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
- xmm_crc1 = _mm_setzero_si128();
- xmm_crc2 = _mm_setzero_si128();
- xmm_crc3 = _mm_setzero_si128();
-
- CRC_SAVE(s)
-
- s->strm->adler = 0;
-}
-
-local void fold_1(deflate_state *const s,
- __m128i *xmm_crc0, __m128i *xmm_crc1,
- __m128i *xmm_crc2, __m128i *xmm_crc3)
-{
- const __m128i xmm_fold4 = _mm_set_epi32(
- 0x00000001, 0x54442bd4,
- 0x00000001, 0xc6e41596);
-
- __m128i x_tmp3;
- __m128 ps_crc0, ps_crc3, ps_res;
-
- x_tmp3 = *xmm_crc3;
-
- *xmm_crc3 = *xmm_crc0;
- *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
- *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
- ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
- ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
- ps_res = _mm_xor_ps(ps_crc0, ps_crc3);
-
- *xmm_crc0 = *xmm_crc1;
- *xmm_crc1 = *xmm_crc2;
- *xmm_crc2 = x_tmp3;
- *xmm_crc3 = _mm_castps_si128(ps_res);
-}
-
-local void fold_2(deflate_state *const s,
- __m128i *xmm_crc0, __m128i *xmm_crc1,
- __m128i *xmm_crc2, __m128i *xmm_crc3)
-{
- const __m128i xmm_fold4 = _mm_set_epi32(
- 0x00000001, 0x54442bd4,
- 0x00000001, 0xc6e41596);
-
- __m128i x_tmp3, x_tmp2;
- __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res31, ps_res20;
-
- x_tmp3 = *xmm_crc3;
- x_tmp2 = *xmm_crc2;
-
- *xmm_crc3 = *xmm_crc1;
- *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
- *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
- ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
- ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
- ps_res31= _mm_xor_ps(ps_crc3, ps_crc1);
-
- *xmm_crc2 = *xmm_crc0;
- *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
- *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
- ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
- ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
- ps_res20= _mm_xor_ps(ps_crc0, ps_crc2);
-
- *xmm_crc0 = x_tmp2;
- *xmm_crc1 = x_tmp3;
- *xmm_crc2 = _mm_castps_si128(ps_res20);
- *xmm_crc3 = _mm_castps_si128(ps_res31);
-}
-
-local void fold_3(deflate_state *const s,
- __m128i *xmm_crc0, __m128i *xmm_crc1,
- __m128i *xmm_crc2, __m128i *xmm_crc3)
-{
- const __m128i xmm_fold4 = _mm_set_epi32(
- 0x00000001, 0x54442bd4,
- 0x00000001, 0xc6e41596);
-
- __m128i x_tmp3;
- __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res32, ps_res21, ps_res10;
-
- x_tmp3 = *xmm_crc3;
-
- *xmm_crc3 = *xmm_crc2;
- *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
- *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
- ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
- ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
- ps_res32 = _mm_xor_ps(ps_crc2, ps_crc3);
-
- *xmm_crc2 = *xmm_crc1;
- *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
- *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
- ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
- ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
- ps_res21= _mm_xor_ps(ps_crc1, ps_crc2);
-
- *xmm_crc1 = *xmm_crc0;
- *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
- *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x10);
- ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
- ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
- ps_res10= _mm_xor_ps(ps_crc0, ps_crc1);
-
- *xmm_crc0 = x_tmp3;
- *xmm_crc1 = _mm_castps_si128(ps_res10);
- *xmm_crc2 = _mm_castps_si128(ps_res21);
- *xmm_crc3 = _mm_castps_si128(ps_res32);
-}
-
-local void fold_4(deflate_state *const s,
- __m128i *xmm_crc0, __m128i *xmm_crc1,
- __m128i *xmm_crc2, __m128i *xmm_crc3)
-{
- const __m128i xmm_fold4 = _mm_set_epi32(
- 0x00000001, 0x54442bd4,
- 0x00000001, 0xc6e41596);
-
- __m128i x_tmp0, x_tmp1, x_tmp2, x_tmp3;
- __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3;
- __m128 ps_t0, ps_t1, ps_t2, ps_t3;
- __m128 ps_res0, ps_res1, ps_res2, ps_res3;
-
- x_tmp0 = *xmm_crc0;
- x_tmp1 = *xmm_crc1;
- x_tmp2 = *xmm_crc2;
- x_tmp3 = *xmm_crc3;
-
- *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
- x_tmp0 = _mm_clmulepi64_si128(x_tmp0, xmm_fold4, 0x10);
- ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
- ps_t0 = _mm_castsi128_ps(x_tmp0);
- ps_res0 = _mm_xor_ps(ps_crc0, ps_t0);
-
- *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
- x_tmp1 = _mm_clmulepi64_si128(x_tmp1, xmm_fold4, 0x10);
- ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
- ps_t1 = _mm_castsi128_ps(x_tmp1);
- ps_res1 = _mm_xor_ps(ps_crc1, ps_t1);
-
- *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
- x_tmp2 = _mm_clmulepi64_si128(x_tmp2, xmm_fold4, 0x10);
- ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
- ps_t2 = _mm_castsi128_ps(x_tmp2);
- ps_res2 = _mm_xor_ps(ps_crc2, ps_t2);
-
- *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x01);
- x_tmp3 = _mm_clmulepi64_si128(x_tmp3, xmm_fold4, 0x10);
- ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
- ps_t3 = _mm_castsi128_ps(x_tmp3);
- ps_res3 = _mm_xor_ps(ps_crc3, ps_t3);
-
- *xmm_crc0 = _mm_castps_si128(ps_res0);
- *xmm_crc1 = _mm_castps_si128(ps_res1);
- *xmm_crc2 = _mm_castps_si128(ps_res2);
- *xmm_crc3 = _mm_castps_si128(ps_res3);
-}
-
-local const unsigned zalign(32) pshufb_shf_table[60] = {
- 0x84838281,0x88878685,0x8c8b8a89,0x008f8e8d, /* shl 15 (16 - 1)/shr1 */
- 0x85848382,0x89888786,0x8d8c8b8a,0x01008f8e, /* shl 14 (16 - 3)/shr2 */
- 0x86858483,0x8a898887,0x8e8d8c8b,0x0201008f, /* shl 13 (16 - 4)/shr3 */
- 0x87868584,0x8b8a8988,0x8f8e8d8c,0x03020100, /* shl 12 (16 - 4)/shr4 */
- 0x88878685,0x8c8b8a89,0x008f8e8d,0x04030201, /* shl 11 (16 - 5)/shr5 */
- 0x89888786,0x8d8c8b8a,0x01008f8e,0x05040302, /* shl 10 (16 - 6)/shr6 */
- 0x8a898887,0x8e8d8c8b,0x0201008f,0x06050403, /* shl 9 (16 - 7)/shr7 */
- 0x8b8a8988,0x8f8e8d8c,0x03020100,0x07060504, /* shl 8 (16 - 8)/shr8 */
- 0x8c8b8a89,0x008f8e8d,0x04030201,0x08070605, /* shl 7 (16 - 9)/shr9 */
- 0x8d8c8b8a,0x01008f8e,0x05040302,0x09080706, /* shl 6 (16 -10)/shr10*/
- 0x8e8d8c8b,0x0201008f,0x06050403,0x0a090807, /* shl 5 (16 -11)/shr11*/
- 0x8f8e8d8c,0x03020100,0x07060504,0x0b0a0908, /* shl 4 (16 -12)/shr12*/
- 0x008f8e8d,0x04030201,0x08070605,0x0c0b0a09, /* shl 3 (16 -13)/shr13*/
- 0x01008f8e,0x05040302,0x09080706,0x0d0c0b0a, /* shl 2 (16 -14)/shr14*/
- 0x0201008f,0x06050403,0x0a090807,0x0e0d0c0b /* shl 1 (16 -15)/shr15*/
-};
-
-local void partial_fold(deflate_state *const s, const size_t len,
- __m128i *xmm_crc0, __m128i *xmm_crc1,
- __m128i *xmm_crc2, __m128i *xmm_crc3,
- __m128i *xmm_crc_part)
-{
-
- const __m128i xmm_fold4 = _mm_set_epi32(
- 0x00000001, 0x54442bd4,
- 0x00000001, 0xc6e41596);
- const __m128i xmm_mask3 = _mm_set1_epi32(0x80808080);
-
- __m128i xmm_shl, xmm_shr, xmm_tmp1, xmm_tmp2, xmm_tmp3;
- __m128i xmm_a0_0, xmm_a0_1;
- __m128 ps_crc3, psa0_0, psa0_1, ps_res;
-
- xmm_shl = _mm_load_si128((__m128i *)pshufb_shf_table + (len - 1));
- xmm_shr = xmm_shl;
- xmm_shr = _mm_xor_si128(xmm_shr, xmm_mask3);
-
- xmm_a0_0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shl);
-
- *xmm_crc0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shr);
- xmm_tmp1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shl);
- *xmm_crc0 = _mm_or_si128(*xmm_crc0, xmm_tmp1);
-
- *xmm_crc1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shr);
- xmm_tmp2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shl);
- *xmm_crc1 = _mm_or_si128(*xmm_crc1, xmm_tmp2);
-
- *xmm_crc2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shr);
- xmm_tmp3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shl);
- *xmm_crc2 = _mm_or_si128(*xmm_crc2, xmm_tmp3);
-
- *xmm_crc3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shr);
- *xmm_crc_part = _mm_shuffle_epi8(*xmm_crc_part, xmm_shl);
- *xmm_crc3 = _mm_or_si128(*xmm_crc3, *xmm_crc_part);
-
- xmm_a0_1 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x10);
- xmm_a0_0 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x01);
-
- ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
- psa0_0 = _mm_castsi128_ps(xmm_a0_0);
- psa0_1 = _mm_castsi128_ps(xmm_a0_1);
-
- ps_res = _mm_xor_ps(ps_crc3, psa0_0);
- ps_res = _mm_xor_ps(ps_res, psa0_1);
-
- *xmm_crc3 = _mm_castps_si128(ps_res);
-}
-
-ZLIB_INTERNAL void crc_fold_copy(deflate_state *const s,
- unsigned char *dst, const unsigned char *src, long len)
-{
- unsigned long algn_diff;
- __m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;
-
- CRC_LOAD(s)
-
- if (len < 16) {
- if (len == 0)
- return;
- goto partial;
- }
-
- algn_diff = 0 - (unsigned long)src & 0xF;
- if (algn_diff) {
- xmm_crc_part = _mm_loadu_si128((__m128i *)src);
- _mm_storeu_si128((__m128i *)dst, xmm_crc_part);
-
- dst += algn_diff;
- src += algn_diff;
- len -= algn_diff;
-
- partial_fold(s, algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
- &xmm_crc_part);
- }
-
- while ((len -= 64) >= 0) {
- xmm_t0 = _mm_load_si128((__m128i *)src);
- xmm_t1 = _mm_load_si128((__m128i *)src + 1);
- xmm_t2 = _mm_load_si128((__m128i *)src + 2);
- xmm_t3 = _mm_load_si128((__m128i *)src + 3);
-
- fold_4(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);
- _mm_storeu_si128((__m128i *)dst + 3, xmm_t3);
-
- xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0);
- xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1);
- xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2);
- xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3);
-
- src += 64;
- dst += 64;
- }
-
- /*
- * len = num bytes left - 64
- */
- if (len + 16 >= 0) {
- len += 16;
-
- xmm_t0 = _mm_load_si128((__m128i *)src);
- xmm_t1 = _mm_load_si128((__m128i *)src + 1);
- xmm_t2 = _mm_load_si128((__m128i *)src + 2);
-
- 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:
- memcpy(&xmm_crc_part, src, len);
-
- _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)
-}
-
-local const unsigned zalign(16) crc_k[] = {
- 0xccaa009e, 0x00000000, /* rk1 */
- 0x751997d0, 0x00000001, /* rk2 */
- 0xccaa009e, 0x00000000, /* rk5 */
- 0x63cd6124, 0x00000001, /* rk6 */
- 0xf7011640, 0x00000001, /* rk7 */
- 0xdb710640, 0x00000001 /* rk8 */
-};
-
-local const unsigned zalign(16) crc_mask[4] = {
- 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000
-};
-
-local const unsigned zalign(16) crc_mask2[4] = {
- 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
-};
-
-unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s)
-{
- const __m128i xmm_mask = _mm_load_si128((__m128i *)crc_mask);
- const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2);
-
- unsigned crc;
- __m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;
-
- CRC_LOAD(s)
-
- /*
- * k1
- */
- crc_fold = _mm_load_si128((__m128i *)crc_k);
-
- 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 = _mm_load_si128((__m128i *)crc_k + 1);
-
- 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 = _mm_load_si128((__m128i *)crc_k + 2);
-
- 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)
-}
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