third_party/zlib/crc_folding.c - Issue 665203006: Revert of Reland "Integrate SIMD optimisations for zlib"

Unified Diff: third_party/zlib/crc_folding.c

Issue 665203006: Revert of Reland "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 98c559cee39cc422f4b04b5e937dea818c1feba1..0000000000000000000000000000000000000000

--- a/third_party/zlib/crc_folding.c

+++ /dev/null

@@ -1,493 +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

- *

- * 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 <emmintrin.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:

-#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)

-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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