| /* |
| * 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 <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 |
| */ |
| |
| #ifdef X86_PCLMULQDQ_CRC |
| #include "../../zbuild.h" |
| |
| #include <immintrin.h> |
| #include <wmmintrin.h> |
| #include <smmintrin.h> // _mm_extract_epi32 |
| |
| #include "x86_features.h" |
| #include "cpu_features.h" |
| |
| #include "../../crc32_fold.h" |
| #include "../../crc32_braid_p.h" |
| #include <assert.h> |
| |
| #ifdef X86_VPCLMULQDQ_CRC |
| extern uint64_t fold_16_vpclmulqdq(__m128i *xmm_crc0, __m128i *xmm_crc1, |
| __m128i *xmm_crc2, __m128i *xmm_crc3, const uint8_t *src, uint64_t len, __m128i init_crc, |
| int32_t first); |
| extern uint64_t fold_16_vpclmulqdq_copy(__m128i *xmm_crc0, __m128i *xmm_crc1, |
| __m128i *xmm_crc2, __m128i *xmm_crc3, uint8_t *dst, const uint8_t *src, uint64_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 uint64_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 + (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_pclmulqdq_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_INITIAL(where) ONCE(where = _mm_xor_si128(where, xmm_initial)) |
| |
| #include "crc32_fold_pclmulqdq_tpl.h" |
| #define COPY |
| #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_pclmulqdq_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 + 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->value = ~((uint32_t)_mm_extract_epi32(xmm_crc3, 2)); |
| |
| return crc->value; |
| } |
| |
| uint32_t crc32_pclmulqdq(uint32_t crc32, const uint8_t *buf, uint64_t len) { |
| /* For lens < 64, crc32_braid method is faster. The CRC32 instruction for |
| * these short lengths might also prove to be effective */ |
| if (len < 64) |
| return crc32_braid(crc32, buf, len); |
| |
| crc32_fold ALIGNED_(16) crc_state; |
| crc32_fold_pclmulqdq_reset(&crc_state); |
| crc32_fold_pclmulqdq(&crc_state, buf, len, crc32); |
| return crc32_fold_pclmulqdq_final(&crc_state); |
| } |
| #endif |
