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ref: 013b2cad191eef50fd4e69c38f1544c5083b640d
dir: /sys/src/libc/68020/strlen.s/

	TEXT	strlen(SB), $0
	MOVL	s+0(FP), A1

	TSTB	(A1)+
	BEQ	null
	MOVL	A1, A2

l1:
	TSTB	(A1)+
	BNE	l1

	SUBL	A2, A1
	MOVL	A1, R0
	RTS

null:
	MOVL	$0, R0
	RTS