File: strcmp.S

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avr-libc 20020203-2
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#include "macros.inc"

#define s1_hi r25
#define s1_lo r24
#define s2_hi r23
#define s2_lo r22

#define ret_hi r25
#define ret_lo r24

; int strcmp(const char *s1, const char *s2)

	.text
	.global	_U(strcmp)
	.type	_U(strcmp), @function
_U(strcmp):
	LOAD_Z(s2_lo, s2_hi)
	LOAD_X(s1_lo, s1_hi)
.strcmp_loop:
	ld	ret_lo, X+
	ld	__tmp_reg__, Z+
	sub	ret_lo, __tmp_reg__
	brne	.strcmp_done
	tst	__tmp_reg__
	brne	.strcmp_loop
.strcmp_done:
; ret_hi = SREG.C ? 0xFF : 0
	sbc	ret_hi, ret_hi
	ret
.strcmp_end:
	.size	_U(strcmp), .strcmp_end - _U(strcmp)