The processor supports 59 different instructions and a register set consisting of 32 general purpose registers and three special purpose registers for the instruction �lter, the clock cycle counter and the program counter.
22.
Later computers generally had more than one general purpose register or RAM location which could be the source or destination or both for arithmetic and so later computers need some other addressing mode to specify the source and destination of arithmetic.
23.
However, the machine also extended the idea of multiple " General Purpose Registers " ( GPRs ), which gave the programmer flexibility to use these high-speed memory caches as they needed, potentially addressing the performance issues.
24.
By contrast, for a standard procedure call, only an address ( a few bits ) needs to be passed for each argument and may even be passed in a general purpose register requiring zero additional storage and zero transfer time.
25.
To reduce the number of ports required to provide data and receive results, the general purpose register file is duplicated so that there are two copies, the first supporting three integer execution units and the second supporting the two load / store units.
26.
In the x86 processor line, a typical pre-486 CPU did not have an individual register file, as all general purpose register were directly work with its decoder, and the x87 push stack was located within the floating-point unit itself.
27.
The competing early RISC design from Stanford University, the Stanford MIPS, also looked at this concept but decided that improved compilers could make more efficient use of general purpose registers than a hard-wired window, something that has proven true over the years.
28.
Once the control program's dispatcher selects a TCB to be dispatched, the context is determined and the general purpose registers are obtained from the appropriate control block, then the PSW is loaded from the appropriate control block thereby dispatching the unit of work.
29.
Unlike what happened when IA-32 was extended to x86-64, no new general purpose registers were added in 64-bit PowerPC, so any performance gained when using the 64-bit mode for applications making no use of the larger address space is minimal.
30.
Modern computer designs generally do not include dedicated index registers; instead they allow any general purpose register to contain an address, and allow a constant value and, on some machines, the contents of another register to be added to it as an offset to form the effective address.
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