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48 lines
696 B
ArmAsm
48 lines
696 B
ArmAsm
#include "textflag.h"
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// func xorfwd(x []byte)
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TEXT ·xorfwd(SB),NOSPLIT,$0
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MOVQ x+0(FP), SI // x[i]
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MOVL x+8(FP), CX // x.len
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MOVQ x+0(FP), DI
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ADDQ $4, DI // x[i+4]
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SUBQ $4, CX
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loop:
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MOVL (SI), AX
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XORL AX, (DI)
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ADDQ $4, SI
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ADDQ $4, DI
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SUBQ $4, CX
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CMPL CX, $0
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JE done
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JMP loop
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done:
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RET
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// func xorbkd(x []byte)
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TEXT ·xorbkd(SB),NOSPLIT,$0
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MOVQ x+0(FP), SI
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MOVL x+8(FP), CX // x.len
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MOVQ x+0(FP), DI
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ADDQ CX, SI // x[-8]
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SUBQ $8, SI
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ADDQ CX, DI // x[-4]
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SUBQ $4, DI
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SUBQ $4, CX
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loop:
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MOVL (SI), AX
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XORL AX, (DI)
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SUBQ $4, SI
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SUBQ $4, DI
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SUBQ $4, CX
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CMPL CX, $0
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JE done
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JMP loop
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done:
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RET
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