.TITLE  COMPARES.  PLM RUNTIME LIBRARY: CMPB/CMPW.
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;  This document and/or portions of the material and data furnished
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        .PSECT  PLMRUN_CODE,RD,NOWRT,EXE,GBL,CON,LONG
 
;
;   W = CMPB(SOURCE1,SOURCE2,COUNT)
;
 
SOURCE1=4			; POINTER.
SOURCE2=8			; POINTER.
COUNT=12			; WORD.
 
	.ENTRY	CMPB.,^M<R2,R3>
	CMPC3	COUNT(AP),@SOURCE1(AP),@SOURCE2(AP)
	BNEQ	1$
        DECW    R0              ; STRINGS EQUAL: RETURN 0FFFFH.
	RET
1$:	SUBW3	R0,COUNT(AP),R0	; RETURN INDEX OF FIRST NON-COMPARE.
	RET
 
;
;   W = CMPW(SOURCE1,SOURCE2,COUNT)
;
 
	.ENTRY	CMPW.,^M<R3>
	MOVZWL	COUNT(AP),R0
	BEQL	3$
	MOVL	SOURCE1(AP),R1
	MOVL	SOURCE2(AP),R3
2$:	CMPW	(R1)+,(R3)+
	BNEQ	4$
	SOBGTR	R0,2$
3$:     DECW    R0              ; STRINGS EQUAL: RETURN 0FFFFH.
	RET
4$:	SUBW3	R0,COUNT(AP),R0	; RETURN INDEX OF FIRST NON-COMPARE.
	RET
	.END