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; XzCrc64Opt.asm -- CRC64 calculation : optimized version
; 2021-02-06 : Igor Pavlov : Public domain
include 7zAsm.asm
MY_ASM_START
ifdef x64
rD equ r9
rN equ r10
rT equ r5
num_VAR equ r8
SRCDAT4 equ dword ptr [rD + rN * 1]
CRC_XOR macro dest:req, src:req, t:req
xor dest, QWORD PTR [rT + src * 8 + 0800h * t]
endm
CRC1b macro
movzx x6, BYTE PTR [rD]
inc rD
movzx x3, x0_L
xor x6, x3
shr r0, 8
CRC_XOR r0, r6, 0
dec rN
endm
MY_PROLOG macro crc_end:req
ifdef ABI_LINUX
MY_PUSH_2_REGS
else
MY_PUSH_4_REGS
endif
mov r0, REG_ABI_PARAM_0
mov rN, REG_ABI_PARAM_2
mov rT, REG_ABI_PARAM_3
mov rD, REG_ABI_PARAM_1
test rN, rN
jz crc_end
@@:
test rD, 3
jz @F
CRC1b
jnz @B
@@:
cmp rN, 8
jb crc_end
add rN, rD
mov num_VAR, rN
sub rN, 4
and rN, NOT 3
sub rD, rN
mov x1, SRCDAT4
xor r0, r1
add rN, 4
endm
MY_EPILOG macro crc_end:req
sub rN, 4
mov x1, SRCDAT4
xor r0, r1
mov rD, rN
mov rN, num_VAR
sub rN, rD
crc_end:
test rN, rN
jz @F
CRC1b
jmp crc_end
@@:
ifdef ABI_LINUX
MY_POP_2_REGS
else
MY_POP_4_REGS
endif
endm
MY_PROC XzCrc64UpdateT4, 4
MY_PROLOG crc_end_4
align 16
main_loop_4:
mov x1, SRCDAT4
movzx x2, x0_L
movzx x3, x0_H
shr r0, 16
movzx x6, x0_L
movzx x7, x0_H
shr r0, 16
CRC_XOR r1, r2, 3
CRC_XOR r0, r3, 2
CRC_XOR r1, r6, 1
CRC_XOR r0, r7, 0
xor r0, r1
add rD, 4
jnz main_loop_4
MY_EPILOG crc_end_4
MY_ENDP
else
; x86 (32-bit)
rD equ r1
rN equ r7
rT equ r5
crc_OFFS equ (REG_SIZE * 5)
if (IS_CDECL gt 0) or (IS_LINUX gt 0)
; cdecl or (GNU fastcall) stack:
; (UInt32 *) table
; size_t size
; void * data
; (UInt64) crc
; ret-ip <-(r4)
data_OFFS equ (8 + crc_OFFS)
size_OFFS equ (REG_SIZE + data_OFFS)
table_OFFS equ (REG_SIZE + size_OFFS)
num_VAR equ [r4 + size_OFFS]
table_VAR equ [r4 + table_OFFS]
else
; Windows fastcall:
; r1 = data, r2 = size
; stack:
; (UInt32 *) table
; (UInt64) crc
; ret-ip <-(r4)
table_OFFS equ (8 + crc_OFFS)
table_VAR equ [r4 + table_OFFS]
num_VAR equ table_VAR
endif
SRCDAT4 equ dword ptr [rD + rN * 1]
CRC macro op0:req, op1:req, dest0:req, dest1:req, src:req, t:req
op0 dest0, DWORD PTR [rT + src * 8 + 0800h * t]
op1 dest1, DWORD PTR [rT + src * 8 + 0800h * t + 4]
endm
CRC_XOR macro dest0:req, dest1:req, src:req, t:req
CRC xor, xor, dest0, dest1, src, t
endm
CRC1b macro
movzx x6, BYTE PTR [rD]
inc rD
movzx x3, x0_L
xor x6, x3
shrd r0, r2, 8
shr r2, 8
CRC_XOR r0, r2, r6, 0
dec rN
endm
MY_PROLOG macro crc_end:req
MY_PUSH_4_REGS
if (IS_CDECL gt 0) or (IS_LINUX gt 0)
proc_numParams = proc_numParams + 2 ; for ABI_LINUX
mov rN, [r4 + size_OFFS]
mov rD, [r4 + data_OFFS]
else
mov rN, r2
endif
mov x0, [r4 + crc_OFFS]
mov x2, [r4 + crc_OFFS + 4]
mov rT, table_VAR
test rN, rN
jz crc_end
@@:
test rD, 3
jz @F
CRC1b
jnz @B
@@:
cmp rN, 8
jb crc_end
add rN, rD
mov num_VAR, rN
sub rN, 4
and rN, NOT 3
sub rD, rN
xor r0, SRCDAT4
add rN, 4
endm
MY_EPILOG macro crc_end:req
sub rN, 4
xor r0, SRCDAT4
mov rD, rN
mov rN, num_VAR
sub rN, rD
crc_end:
test rN, rN
jz @F
CRC1b
jmp crc_end
@@:
MY_POP_4_REGS
endm
MY_PROC XzCrc64UpdateT4, 5
MY_PROLOG crc_end_4
movzx x6, x0_L
align 16
main_loop_4:
mov r3, SRCDAT4
xor r3, r2
CRC xor, mov, r3, r2, r6, 3
movzx x6, x0_H
shr r0, 16
CRC_XOR r3, r2, r6, 2
movzx x6, x0_L
movzx x0, x0_H
CRC_XOR r3, r2, r6, 1
CRC_XOR r3, r2, r0, 0
movzx x6, x3_L
mov r0, r3
add rD, 4
jnz main_loop_4
MY_EPILOG crc_end_4
MY_ENDP
endif ; ! x64
end
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