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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)

accumulator: n. obs. 1. Archaic term for a register. On-line 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.

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