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Power-Programmierung
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CD1.mdf
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assemblr
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library
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zenlib
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lst7_20.asm
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Assembly Source File
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1990-02-15
|
385b
|
20 lines
;
; *** Listing 7-20 ***
;
; Measures the performance of multiplying by 80 with
; shifts and adds.
;
sub ax,ax
call ZTimerOn
rept 1000
mov ax,10 ;so we have a constant value to
; multiply by
mov cl,4
shl ax,cl ;times 16
mov cx,ax ;set aside times 16
shl ax,1 ;times 32
shl ax,1 ;times 64
add ax,cx ;times 80 (times 64 + times 16)
endm
call ZTimerOff