Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Suppose that you are working with a CISC machine using a 2.5 GHz clock (i.e., the clock ticks 2.5
billion times per second). This particular computer uses MASM-like instructions with the following
timings:
ADD reg, mem ; 7 clock cycles (i.e., the ADD micro-program has 7 instructions)
ADD reg, immed ; 4 clock cycles
LOOP Label Name ; 6 clock cycles
Suppose that the following code fragment is used to sum elements of a numeric array. For this
problem, assume that memory limitations are non-existent and that there is no limit to the size of the
array.
MOV
BX, 0
ECX, MAX SIZE
MOV
MOV ESI, OFFSET list
_ProcessArray:
ADD
AD
LOOP
BX, [ESI]
ESI,
_ProcessArray
;initialize sum
; initialize LOOP counter
; initialize array pointer
;Add current list element
; Move array pointer
next element
; auto-decrement ECX, jump to more if ECX = 0
After initialization, how many array elements can be processed in 3.1 millisecond (ms)? Round your
answer to the nearest integer. Note that 1 ms = 0.001 second.
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Transcribed Image Text:Suppose that you are working with a CISC machine using a 2.5 GHz clock (i.e., the clock ticks 2.5 billion times per second). This particular computer uses MASM-like instructions with the following timings: ADD reg, mem ; 7 clock cycles (i.e., the ADD micro-program has 7 instructions) ADD reg, immed ; 4 clock cycles LOOP Label Name ; 6 clock cycles Suppose that the following code fragment is used to sum elements of a numeric array. For this problem, assume that memory limitations are non-existent and that there is no limit to the size of the array. MOV BX, 0 ECX, MAX SIZE MOV MOV ESI, OFFSET list _ProcessArray: ADD AD LOOP BX, [ESI] ESI, _ProcessArray ;initialize sum ; initialize LOOP counter ; initialize array pointer ;Add current list element ; Move array pointer next element ; auto-decrement ECX, jump to more if ECX = 0 After initialization, how many array elements can be processed in 3.1 millisecond (ms)? Round your answer to the nearest integer. Note that 1 ms = 0.001 second.
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