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v2fly/transport/internet/kcp/xor_amd64.s
Darien Raymond e0a2247a07
Revert "temporarily disable asm code"
This reverts commit 6e28b4f91d.
2018-07-29 03:15:14 +02:00

48 lines
752 B
ArmAsm

#include "textflag.h"
// func xorfwd(x []byte)
TEXT ·xorfwd(SB),NOSPLIT,$0
MOVQ x+0(FP), SI // x[i]
MOVQ x_len+8(FP), CX // x.len
MOVQ x+0(FP), DI
ADDQ $4, DI // x[i+4]
SUBQ $4, CX
xorfwdloop:
MOVL (SI), AX
XORL AX, (DI)
ADDQ $4, SI
ADDQ $4, DI
SUBQ $4, CX
CMPL CX, $0
JE xorfwddone
JMP xorfwdloop
xorfwddone:
RET
// func xorbkd(x []byte)
TEXT ·xorbkd(SB),NOSPLIT,$0
MOVQ x+0(FP), SI
MOVQ x_len+8(FP), CX // x.len
MOVQ x+0(FP), DI
ADDQ CX, SI // x[-8]
SUBQ $8, SI
ADDQ CX, DI // x[-4]
SUBQ $4, DI
SUBQ $4, CX
xorbkdloop:
MOVL (SI), AX
XORL AX, (DI)
SUBQ $4, SI
SUBQ $4, DI
SUBQ $4, CX
CMPL CX, $0
JE xorbkddone
JMP xorbkdloop
xorbkddone:
RET