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In a computer's central processing unit (CPU), the accumulator is a register in which intermediate arithmetic logic unit results are stored.. Without a register like an accumulator, it would be necessary to write the result of each calculation (addition, multiplication, shift, etc.) to cache or main memory, perhaps only to be read right back again for use in the next operation.
If accumulator (AL/AX/EAX/RAX) compares equal to first operand, [c] then EFLAGS.ZF is set to 1 and the first operand is overwritten with the second operand. Otherwise, EFLAGS.ZF is set to 0, and first operand is copied into the accumulator. Instruction atomic only if used with LOCK prefix. CMPXCHG r/m,r16 CMPXCHG r/m,r32: 0F B1 /r [b] XADD r/m ...
More practical accumulators use a quasi-commutative hash function, so that the size of the accumulator does not grow with the number of members. For example, Benaloh and de Mare propose a cryptographic accumulator inspired by RSA : the quasi-commutative function h ( x , y ) := x y ( mod n ) {\displaystyle h(x,y):=x^{y}{\pmod {n}}} for some ...
The hardware unit that performs the operation is known as a multiplier–accumulator (MAC unit); the operation itself is also often called a MAC or a MAD operation. The MAC operation modifies an accumulator a : a ← a + ( b × c ) {\displaystyle a\gets a+(b\times c)}
Where these two bits are equal, the product accumulator P is left unchanged. Where y i = 0 and y i−1 = 1, the multiplicand times 2 i is added to P; and where y i = 1 and y i−1 = 0, the multiplicand times 2 i is subtracted from P. The final value of P is the signed product.
It is possible to create a logical circuit using multiple full adders to add N-bit numbers. Each full adder inputs a C i n {\displaystyle C_{in}} , which is the C o u t {\displaystyle C_{out}} of the previous adder.
Little Man Computer simulator. The Little Man Computer (LMC) is an instructional model of a computer, created by Dr. Stuart Madnick in 1965. [1] The LMC is generally used to teach students, because it models a simple von Neumann architecture computer—which has all of the basic features of a modern computer.
hyperaccumulators and contaminants : Al, Ag, As, Be, Cr, Cu, Mn, Hg, Mo, naphthalene, Pb, Se, Zn – accumulation rates ; Contaminant Accumulation rates (in mg/kg dry ...