/* * Compute the CRC32 using a parallelized folding approach with the PCLMULQDQ * instruction. * * A white paper describing this algorithm can be found at: * doc/crc-pclmulqdq.pdf * * Copyright (C) 2013 Intel Corporation. All rights reserved. * Copyright (C) 2016 Marian Beermann (support for initial value) * Authors: * Wajdi Feghali * Jim Guilford * Vinodh Gopal * Erdinc Ozturk * Jim Kukunas * * For conditions of distribution and use, see copyright notice in zlib.h */ #include "zbuild.h" #include #include #include // _mm_extract_epi32 #ifdef X86_VPCLMULQDQ # include #endif #include "crc32.h" #include "crc32_braid_p.h" #include "crc32_braid_tbl.h" #include "x86_intrins.h" #include #ifdef X86_VPCLMULQDQ static size_t fold_16_vpclmulqdq(__m128i *xmm_crc0, __m128i *xmm_crc1, __m128i *xmm_crc2, __m128i *xmm_crc3, const uint8_t *src, size_t len, __m128i init_crc, int32_t first); static size_t fold_16_vpclmulqdq_copy(__m128i *xmm_crc0, __m128i *xmm_crc1, __m128i *xmm_crc2, __m128i *xmm_crc3, uint8_t *dst, const uint8_t *src, size_t len); #endif static void fold_1(__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); } static void fold_2(__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); } static void fold_3(__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); } static void fold_4(__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); } static const unsigned ALIGNED_(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*/ }; static void partial_fold(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((int32_t)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 + (4 * (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); } static inline void crc32_fold_load(__m128i *fold, __m128i *fold0, __m128i *fold1, __m128i *fold2, __m128i *fold3) { *fold0 = _mm_load_si128(fold + 0); *fold1 = _mm_load_si128(fold + 1); *fold2 = _mm_load_si128(fold + 2); *fold3 = _mm_load_si128(fold + 3); } static inline void crc32_fold_save(__m128i *fold, const __m128i *fold0, const __m128i *fold1, const __m128i *fold2, const __m128i *fold3) { _mm_storeu_si128(fold + 0, *fold0); _mm_storeu_si128(fold + 1, *fold1); _mm_storeu_si128(fold + 2, *fold2); _mm_storeu_si128(fold + 3, *fold3); } Z_INTERNAL uint32_t CRC32_FOLD_RESET(crc32_fold *crc) { __m128i xmm_crc0 = _mm_cvtsi32_si128(0x9db42487); __m128i xmm_zero = _mm_setzero_si128(); crc32_fold_save((__m128i *)crc->fold, &xmm_crc0, &xmm_zero, &xmm_zero, &xmm_zero); return 0; } #define ONCE(op) if (first) { first = 0; op; } #define XOR_INITIAL128(where) ONCE(where = _mm_xor_si128(where, xmm_initial)) #ifdef X86_VPCLMULQDQ # define XOR_INITIAL512(where) ONCE(where = _mm512_xor_si512(where, zmm_initial)) #endif #ifdef X86_VPCLMULQDQ # include "crc32_fold_vpclmulqdq_tpl.h" #endif #include "crc32_fold_pclmulqdq_tpl.h" #define COPY #ifdef X86_VPCLMULQDQ # include "crc32_fold_vpclmulqdq_tpl.h" #endif #include "crc32_fold_pclmulqdq_tpl.h" static const unsigned ALIGNED_(16) crc_k[] = { 0xccaa009e, 0x00000000, /* rk1 */ 0x751997d0, 0x00000001, /* rk2 */ 0xccaa009e, 0x00000000, /* rk5 */ 0x63cd6124, 0x00000001, /* rk6 */ 0xf7011640, 0x00000001, /* rk7 */ 0xdb710640, 0x00000001 /* rk8 */ }; static const unsigned ALIGNED_(16) crc_mask[4] = { 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000 }; static const unsigned ALIGNED_(16) crc_mask2[4] = { 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; Z_INTERNAL uint32_t CRC32_FOLD_FINAL(crc32_fold *crc) { const __m128i xmm_mask = _mm_load_si128((__m128i *)crc_mask); const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2); __m128i xmm_crc0, xmm_crc1, xmm_crc2, xmm_crc3; __m128i x_tmp0, x_tmp1, x_tmp2, crc_fold; crc32_fold_load((__m128i *)crc->fold, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3); /* * 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 + 4)); 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 + 8)); 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->value = ~((uint32_t)_mm_extract_epi32(xmm_crc3, 2)); return crc->value; } static inline uint32_t crc32_small(uint32_t crc, const uint8_t *buf, size_t len) { uint32_t c = (~crc) & 0xffffffff; while (len) { len--; DO1; } return c ^ 0xffffffff; } Z_INTERNAL uint32_t CRC32(uint32_t crc32, const uint8_t *buf, size_t len) { /* For lens smaller than ~12, crc32_small method is faster. * But there are also minimum requirements for the pclmul functions due to alignment */ if (len < 16) return crc32_small(crc32, buf, len); crc32_fold ALIGNED_(16) crc_state; CRC32_FOLD_RESET(&crc_state); CRC32_FOLD(&crc_state, buf, len, crc32); return CRC32_FOLD_FINAL(&crc_state); }