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ncompare.lib
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1984-04-29
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; MACRO LIBRARY FOR 8-BIT COMPARISON OPERATION
;
TEST? MACRO X,Y
;; UTILTITY MACRO TO GENERATE CONDITION CODES
IF NOT NUL X ;;THEN LOAD X
LDA X ;;X ASSUMED TO BE IN MEMORY
ENDIF
IRPC ?Y,Y ;;Y MAY BE CONSTANT OPERAND
TDIG? SET '&?Y'-'0' ;;FIRST CHAR DIGIT?
EXITM ;;STOP IRPC AFTER FIRST CHAR
ENDM
IF TDIG? <= 9 ;;Y NUMERIC?
SUI Y ;;YES, SO SUB IMMEDIATE
ELSE
LXI H,Y ;;Y NOT NUMERIC
SUB M ;;SO SUB FROM MEMORY
ENDM
;
LSS MACRO X,Y,TL,FL
;; X LSS THAN Y TEST,
;; IF TL IS PRESENT, ASSUME TRUE TEST
;; IF TL IS ABSENT, THEN INVERT TEST
IF NUL TL
GEQ X,Y,FL
ELSE
TEST? X,Y ;;SET CONDITION CODES
JC TL
ENDM
;
LEQ MACRO X,Y,TL,FL
;; X LESS THAN OR EQUAL TO Y TEST
IF NUL TL
GTR X,Y,FL
ELSE
LSS X,Y,TL
JZ TL
ENDM
;
EQL MACRO X,Y,TL,FL
;; X EQUAL TO Y TEST
IF NUL TL
NEQ X,Y,FL
ELSE
TEST? X,Y
JZ TL
ENDM
;
NEQ MACRO X,Y,TL,FL
;; X NOT EQUAL TO Y TEST
IF NUL TL
EQL X,Y,FL
ELSE
TEST? X,Y
JNZ TL
ENDM
;
GEQ MACRO X,Y,TL,FL
;; X GREATER THAN OR EQUAL TO Y TEST
IF NUL TL
LSS X,Y,FL
ELSE
TEST? X,Y
JNC TL
ENDM
;
GTR MACRO X,Y,TL,FL
;; X GREATER THAN Y TEST
IF NUL TL
LEQ X,Y,FL
ELSE
LOCAL GFL ;;FALSE LABEL
TEST? X,Y
JC GFL
DCR A
JNC TL
GFL: ENDM