accumulator 音标拼音: [əkj'umjəl
, etɚ]
n . 积聚者,蓄能器,蓄电池
积聚者,蓄能器,蓄电池
accumulator 累积器; 累加器
AC
accumulator 累积器
accumulator 累积器 累加器
accumulator n 1 :
a person who is employed to collect payments (
as for rent or taxes ) [
synonym : {
collector }, {
gatherer }, {
accumulator }]
2 :
a voltaic battery that stores electric charge [
synonym : {
storage battery }, {
accumulator }]
3 : (
computer science )
a register that has a built -
in adder that adds an input number to the contents of the register [
synonym :
{
accumulator }, {
accumulator register }]
Accumulator \
Ac *
cu "
mu *
la `
tor \,
n . [
L .]
1 .
One who ,
or that which ,
accumulates ,
collects ,
or amasses .
[
1913 Webster ]
2 . (
Mech .)
An apparatus by means of which energy or power can be stored ,
such as the cylinder or tank for storing water for hydraulic elevators ,
the secondary or storage battery used for accumulating the energy of electrical charges ,
etc .
[
1913 Webster ]
3 .
A system of elastic springs for relieving the strain upon a rope ,
as in deep -
sea dredging .
[
1913 Webster ]
In a {central processing unit }, a {register } in
which intermediate results are stored . Without an
accumulator , it would be necessary to write the result of each
calculation (addition , multiplication , {shift }, etc .) to {main
memory } and read them back . Access to main memory is slower
than access to the accumulator which usually has direct paths
to and from the {arithmetic and logic unit } (ALU ).
The {canonical } example is summing a list of numbers . The
accumulator is set to zero initially , each number in turn is
added to the value in the accumulator and only when all
numbers have been added is the result written to main memory .
Modern CPUs usually have many registers , all or many of which
can be used as accumulators . For this reason , the term
accumulator " is somewhat archaic . Use of it as a synonym for
register " is a fairly reliable indication that the user has
been around for quite a while and /or that the architecture
under discussion is quite old . The term in full is almost
never used of microprocessor registers , for example , though
symbolic names for arithmetic registers beginning in "A "
derive from historical use of the term "accumulator " (and not ,
actually , from "arithmetic "). Confusingly , though , an "A "
register name prefix may also stand for "address ", as for
example on the {Motorola } {680x0 } family .
2 . A register , memory location or variable being
used for arithmetic or logic (as opposed to addressing or a
loop index ), especially one being used to accumulate a sum or
count of many items . This use is in context of a particular
routine or stretch of code . "The FOOBAZ routine uses A3 as an
accumulator ."
Jargon File }]
1999 -04 -20 )
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