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28 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
31 ; UINT32 crc32_ieee_by4(
32 ; UINT32 init_crc, //initial CRC value, 32 bits
33 ; const unsigned char *buf, //buffer pointer to calculate CRC on
34 ; UINT64 len //buffer length in bytes (64-bit data)
42 ; Reference paper titled "Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction"
43 ; URL: http://download.intel.com/design/intarch/papers/323102.pdf
46 %include "reg_sizes.asm"
48 %define fetch_dist 1024
55 %ifidn __OUTPUT_FORMAT__, win64
60 %xdefine arg1_low32 ecx
66 %xdefine arg1_low32 edi
69 %ifidn __OUTPUT_FORMAT__, win64
71 %define VARIABLE_OFFSET 16*4+8
73 %define VARIABLE_OFFSET 16*2+8
77 global crc32_ieee_by4:function
82 sub rsp,VARIABLE_OFFSET
84 %ifidn __OUTPUT_FORMAT__, win64
85 ; push the xmm registers into the stack to maintain
86 movdqa [rsp + XMM_SAVE + 16*0],xmm6
87 movdqa [rsp + XMM_SAVE + 16*1],xmm7
90 ; check if smaller than 128B
96 ; load the initial crc value
97 movd xmm6, arg1_low32 ; initial crc
98 ; crc value does not need to be byte-reflected, but it needs to be
99 ; moved to the high part of the register.
100 ; because data will be byte-reflected and will align with initial
101 ; crc at correct place.
106 movdqa xmm7, [SHUF_MASK]
107 ; receive the initial 64B data, xor the initial crc value
109 movdqu xmm1, [arg2+16]
110 movdqu xmm2, [arg2+32]
111 movdqu xmm3, [arg2+48]
116 ; XOR the initial_crc value
122 movdqa xmm6, [rk3] ; k3=2^480 mod POLY << 32
123 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
124 ;we subtract 128 instead of 64 to save one instruction from the loop
127 ; at this section of the code, there is 64*x+y (0<=y<64) bytes of
128 ; buffer. The _fold_64_B_loop loop will fold 64B at a time until we
129 ; have 64+y Bytes of buffer
132 ; fold 64B at a time. This section of the code folds 4 xmm registers in parallel
135 ;update the buffer pointer
138 prefetchnta [arg2+fetch_dist+0]
142 pclmulqdq xmm0, xmm6 , 0x11
143 pclmulqdq xmm1, xmm6 , 0x11
145 pclmulqdq xmm4, xmm6, 0x0
146 pclmulqdq xmm5, xmm6, 0x0
151 prefetchnta [arg2+fetch_dist+32]
155 pclmulqdq xmm2, xmm6, 0x11
156 pclmulqdq xmm3, xmm6, 0x11
158 pclmulqdq xmm4, xmm6, 0x0
159 pclmulqdq xmm5, xmm6, 0x0
165 movdqu xmm5, [arg2+16]
171 movdqu xmm4, [arg2+32]
172 movdqu xmm5, [arg2+48]
181 ; check if there is another 64B in the buffer to be able to fold
183 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
187 ;at this point, the arg2 is pointing at the last y Bytes of the buffer
188 ; the 64B of data is in 4 of the xmm registers: xmm0, xmm1, xmm2, xmm3
191 movdqa xmm6, [rk1] ;k1
193 ; fold the 4 xmm registers to 1 xmm register with different constants
195 pclmulqdq xmm0, xmm6, 0x11
196 pclmulqdq xmm4, xmm6, 0x0
201 pclmulqdq xmm1, xmm6, 0x11
202 pclmulqdq xmm4, xmm6, 0x0
207 pclmulqdq xmm2, xmm6, 0x11
208 pclmulqdq xmm4, xmm6, 0x0
213 ;instead of 64, we add 48 to the loop counter to save 1 instruction from the loop
214 ; instead of a cmp instruction, we use the negative flag with the jl instruction
216 jl _final_reduction_for_128
218 ; now we have 16+y bytes left to reduce. 16 Bytes is in register xmm3 and the rest is in memory
219 ; we can fold 16 bytes at a time if y>=16
220 ; continue folding 16B at a time
224 pclmulqdq xmm3, xmm6, 0x11
225 pclmulqdq xmm4, xmm6, 0x0
232 ; instead of a cmp instruction, we utilize the flags with the jge instruction
233 ; equivalent of: cmp arg3, 16-16
234 ; check if there is any more 16B in the buffer to be able to fold
235 jge _16B_reduction_loop
237 ;now we have 16+z bytes left to reduce, where 0<= z < 16.
238 ;first, we reduce the data in the xmm3 register
242 _final_reduction_for_128:
243 ; check if any more data to fold. If not, compute the CRC of the final 128 bits
247 ; here we are getting data that is less than 16 bytes.
248 ; since we know that there was data before the pointer, we can offset
249 ; the input pointer before the actual point, to receive exactly 16 bytes.
250 ; after that the registers need to be adjusted.
254 movdqu xmm1, [arg2 - 16 + arg3]
258 lea rax, [pshufb_shf_table + 15*16]
268 pblendvb xmm1, xmm2 ;xmm0 is implicit
273 pclmulqdq xmm3, xmm6, 0x11
275 pclmulqdq xmm4, xmm6, 0x0
285 pclmulqdq xmm3, xmm6, 0x1
295 pclmulqdq xmm3, xmm6, 0x10
302 pclmulqdq xmm3, xmm6, 0x01
304 pclmulqdq xmm3, xmm6, 0x11
312 %ifidn __OUTPUT_FORMAT__, win64
313 movdqa xmm6, [rsp + XMM_SAVE + 16*0]
314 movdqa xmm7, [rsp + XMM_SAVE + 16*1]
316 add rsp,VARIABLE_OFFSET
327 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
328 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
329 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
330 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
335 ;check if there is enough buffer to be able to fold 16B at a time
338 movdqa xmm7, [SHUF_MASK]
340 ;if there is, load the constants
341 movdqa xmm6, [rk1] ;k1
343 movd xmm0, arg1_low32
350 ;update the buffer pointer
353 ;update the counter. subtract 32 instead of 16 to save one instruction from the loop
356 jmp _16B_reduction_loop
365 movdqa xmm7, [SHUF_MASK]
367 movd xmm0, arg1_low32
372 jl _less_than_16_left
373 movd xmm0, arg1_low32
380 movdqa xmm6, [rk1] ;k1
381 jmp _get_last_two_xmms
386 ; use stack space to load data less than 16 bytes, zero-out the 16B in memory first.
438 lea rax, [pshufb_shf_table + 15*16]
500 ; precomputed constants
505 DQ 0xf200aa6600000000
507 DQ 0x17d3315d00000000
509 DQ 0xd3504ec700000000
511 DQ 0x57a8445500000000
513 DQ 0xf200aa6600000000
515 DQ 0x490d678d00000000
517 DQ 0x0000000104d101df
519 DQ 0x0000000104c11db7
521 dq 0xFFFFFFFFFFFFFFFF, 0x0000000000000000
523 dq 0xFFFFFFFF00000000, 0xFFFFFFFFFFFFFFFF
525 dq 0x8080808080808080, 0x8080808080808080
527 dq 0xFFFFFFFFFFFFFFFF, 0x00000000FFFFFFFF
531 dq 0x8887868584838281, 0x008f8e8d8c8b8a89 ; shl 15 (16-1) / shr1
533 dq 0x8988878685848382, 0x01008f8e8d8c8b8a ; shl 14 (16-3) / shr2
535 dq 0x8a89888786858483, 0x0201008f8e8d8c8b ; shl 13 (16-4) / shr3
537 dq 0x8b8a898887868584, 0x030201008f8e8d8c ; shl 12 (16-4) / shr4
539 dq 0x8c8b8a8988878685, 0x04030201008f8e8d ; shl 11 (16-5) / shr5
541 dq 0x8d8c8b8a89888786, 0x0504030201008f8e ; shl 10 (16-6) / shr6
543 dq 0x8e8d8c8b8a898887, 0x060504030201008f ; shl 9 (16-7) / shr7
545 dq 0x8f8e8d8c8b8a8988, 0x0706050403020100 ; shl 8 (16-8) / shr8
547 dq 0x008f8e8d8c8b8a89, 0x0807060504030201 ; shl 7 (16-9) / shr9
549 dq 0x01008f8e8d8c8b8a, 0x0908070605040302 ; shl 6 (16-10) / shr10
551 dq 0x0201008f8e8d8c8b, 0x0a09080706050403 ; shl 5 (16-11) / shr11
553 dq 0x030201008f8e8d8c, 0x0b0a090807060504 ; shl 4 (16-12) / shr12
555 dq 0x04030201008f8e8d, 0x0c0b0a0908070605 ; shl 3 (16-13) / shr13
557 dq 0x0504030201008f8e, 0x0d0c0b0a09080706 ; shl 2 (16-14) / shr14
559 dq 0x060504030201008f, 0x0e0d0c0b0a090807 ; shl 1 (16-15) / shr15
562 SHUF_MASK dq 0x08090A0B0C0D0E0F, 0x0001020304050607
564 ;;; func core, ver, snum
565 slversion crc32_ieee_by4, 05, 02, 0017