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POWER2.ASM
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Assembly Source File
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1987-07-31
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2KB
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64 lines
; Default command line for BASIC: MASM /Dmodel=medium /DBASIC power2;
; Default command line for C: MASM /MX /Dmodel=small /DcLang power2;
; Default command line for FORTRAN: MASM /Dmodel=large /DFORTRAN power2;
; Default command line for Pascal: MASM /Dmodel=large /DPascal power2;
INCLUDE mixed.inc
setModel %model
IFDEF BASIC
reference EQU 1
ENDIF
IFDEF FORTRAN
reference EQU 1
ENDIF
.CODE
; Function for C, FORTRAN, Pascal, Version 4 of QuickBASIC, and
; future versions of Microsoft and IBM BASIC Compilers
IFDEF reference ; Pass by reference for BASIC or FORTRAN
hProc Power2, Value:PTR, Count:PTR
pLes bx,Value ; Load arguments passed by reference
mov ax,FP[bx]
pLes bx,Count
mov cx,FP[bx]
ELSE ; Pass by value for C or Pascal
hProc Power2, Value, Count
mov ax,Value ; Load arguments passed by value
mov cx,Count
ENDIF
shl ax,cl ; AX = AX * (2 to power of CL)
; Return result in AX
hRet
hEndp
IFDEF BASIC
; Subprogram for QuickBASIC, Versions 1, 2, and 3;
; for the Microsoft BASIC Compiler through Version 5.36
; for the IBM BASIC Compiler through Version 2.02
hProc Power2S, Value, Count, RetVal
pLes bx,Value ; Load BASIC arguments
mov ax,FP[bx] ; passed by reference
pLes bx,Count
mov cx,FP[bx]
shl ax,cl ; AX = AX * (2 to power of CL)
pLes bx,RetVal ; Load return address
mov FP[bx],ax ; and store result in it
hRet
hEndp
ENDIF ; BASIC
END