leff@smu.edu (Laurence Leff) (12/19/89)
This item is extracted from IBM PC Assembly Language: A Guide for Programmers Page 43 Leo J. Scanlon The EXITM Pseudo-Op The EXITM pseudo-op makes the macro expansion terminate early, based on the outcome of a preceding test. For instance, recall the ALLOCATE macro that we defined with the REPT pseudo-op. You might like to redefine this macro so that the assembler only allocates the table space if the LENGTH parameter is less than 50. A macro that makes this determination is: ALL_LT_50 MACRO LENGTH LOCAL OKAY VALUE = 0 MOV AX,LENGTH CMP AX,50 ;Is LENGTH < 50 JB OKAY EXITM ; If not, exit OKAY: REPT LENGTH ; If so, allocate the table VALUE = VALUE+1 DB VALUE ENDM Laurence Leff, Ph.D |A job is like sex, when you do it for money CS,SMU, Dallas, Texas 75275-0122, |You take away all the fun. Phone: 214-692-3459 Moderator comp.doc.techreports/TRLIST, Symbolic Math List convex!smu!leff leff%smu.uucp@uunet E1AR0002 at SMUVM1 (BITNET)