1/*
2Copyright (c) 2009 Nick Clifton <nickc@redhat.com>
3 */
4	.file	"strcmp.S"
5
6	.section .text
7
8	.global  _strcmp
9	.type	 _strcmp,@function
10_strcmp:
11#ifdef __RX_DISALLOW_STRING_INSNS__
122:	mov.b	[r1+], r4
13	mov.b	[r2+], r5
14	cmp	#0, r4
15	beq	3f
16	cmp	#0, r5
17	beq	3f
18	cmp	r4, r5
19	beq	2b
20
213:	and	#0xff, r4	; We need to perform an unsigned comparison of the bytes.
22	and	#0xff, r5
23	sub	r5, r4, r1
24	rts
25#else
26	mov	#-1, r3		; Strictly speaking this is incorrect, but I doubt if anyone will ever know.
27	scmpu			; Perform the string comparison
28	bnc	1f		; If Carry is not set skip over
29	scne.L	r1		; Set result based on Z flag
30	rts			;
311:				;
32	mov	#-1,r1		; Carry not set, result should be negative
33	rts			;
34#endif
35	.size _strcmp, . - _strcmp
36
37