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crc_folding.c
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crc_folding.c
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/*
* 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"
#ifdef CRC32_SIMD_SSE42_PCLMUL
#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 - (uintptr_t)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)
}
#endif /* CRC32_SIMD_SSE42_PCLMUL */