xref: /plan9/sys/src/libc/386/strcpy.s (revision 3e12c5d1bb89fc02707907988834ef147769ddaf)
1*3e12c5d1SDavid du Colombier	TEXT	strcpy(SB),$0
2*3e12c5d1SDavid du Colombier
3*3e12c5d1SDavid du Colombier	MOVL	$0, AX
4*3e12c5d1SDavid du Colombier	MOVL	$-1, CX
5*3e12c5d1SDavid du Colombier	CLD
6*3e12c5d1SDavid du Colombier/*
7*3e12c5d1SDavid du Colombier * find end of second string
8*3e12c5d1SDavid du Colombier */
9*3e12c5d1SDavid du Colombier
10*3e12c5d1SDavid du Colombier	MOVL	p2+4(FP), DI
11*3e12c5d1SDavid du Colombier	REPN;	SCASB
12*3e12c5d1SDavid du Colombier
13*3e12c5d1SDavid du Colombier	MOVL	DI, BX
14*3e12c5d1SDavid du Colombier	SUBL	p2+4(FP), BX
15*3e12c5d1SDavid du Colombier
16*3e12c5d1SDavid du Colombier/*
17*3e12c5d1SDavid du Colombier * copy the memory
18*3e12c5d1SDavid du Colombier */
19*3e12c5d1SDavid du Colombier	MOVL	p1+0(FP), DI
20*3e12c5d1SDavid du Colombier	MOVL	p2+4(FP), SI
21*3e12c5d1SDavid du Colombier/*
22*3e12c5d1SDavid du Colombier * copy whole longs
23*3e12c5d1SDavid du Colombier */
24*3e12c5d1SDavid du Colombier	MOVL	BX, CX
25*3e12c5d1SDavid du Colombier	SHRL	$2, CX
26*3e12c5d1SDavid du Colombier	REP;	MOVSL
27*3e12c5d1SDavid du Colombier/*
28*3e12c5d1SDavid du Colombier * copy the rest, by bytes
29*3e12c5d1SDavid du Colombier */
30*3e12c5d1SDavid du Colombier	ANDL	$3, BX
31*3e12c5d1SDavid du Colombier	MOVL	BX, CX
32*3e12c5d1SDavid du Colombier	REP;	MOVSB
33*3e12c5d1SDavid du Colombier
34*3e12c5d1SDavid du Colombier	MOVL	p1+0(FP), AX
35*3e12c5d1SDavid du Colombier	RET
36