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Digital-Research-Source-Code/ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmudi/compares.mar
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2020-11-06 18:50:37 +01:00

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.TITLE COMPARES. PLM RUNTIME LIBRARY: CMPB/CMPW.
;-----------------------------------------------------------------------
;
; D I S C L A I M E R N O T I C E
; ------------------- -----------
;
; This document and/or portions of the material and data furnished
; herewith, was developed under sponsorship of the U. S. Government.
; Neither the U.S. nor the U.S.D.O.E., nor the Leland Stanford Junior
; University, nor their employees, nor their respective contractors,
; subcontractors, or their employees, makes any warranty, express or
; implied, or assumes any liability or responsibility for accuracy,
; completeness or usefulness of any information, apparatus, product
; or process disclosed, or represents that its use will not infringe
; privately-owned rights. Mention of any product, its manufacturer,
; or suppliers shall not, nor is it intended to, imply approval, dis-
; approval, or fitness for any particular use. The U. S. and the
; University at all times retain the right to use and disseminate same
; for any purpose whatsoever. Such distribution shall be made by the
; National Energy Software Center at the Argonne National Laboratory
; and only subject to the distributee furnishing satisfactory proof
; that he has a valid license from the Intel Corporation in effect.
;
;-----------------------------------------------------------------------
.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