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In computer architecture, a processor register is a quickly accessible location available to a computer's central processing unit (CPU).
Registers usually consist of a small amount of fast storage, although some registers have specific hardware functions, and may be read-only or write-only.
They were also readily usable with the Z80 and similar processors.
8086/8088, 80186/80188, 80286, with 8087, 80187 or 80287 for floating-point, with an 80-bit wide, 8 deep register stack with some instructions able to use registers relative to the top of the stack as operands; without 8087/80187/80287, no floating-point registers 80386 required 80387 for floating-point, later processors had built-in floating point, with both having an 80-bit wide, 8 deep register stack with some instructions able to use registers relative to the top of the stack as operands.
In some architectures (such as SPARC and MIPS), the first or last register in the integer register file is a pseudo-register in a way that it is hardwired to always return zero when read (mostly to simplify indexing modes), and it cannot be overwritten.
In Alpha this is also done for the floating-point register file.
Allocating frequently used variables to registers can be critical to a program's performance; this register allocation is performed either by a compiler in the code generation phase, or manually by an assembly language programmer.
However, modern high-performance CPUs often have duplicates of these "architectural registers" in order to improve performance via register renaming, allowing parallel and speculative execution.As a result of this, register files are commonly quoted as having one register more than how many of them are actually usable; for example, 32 registers are quoted when only 31 of them fit within the above definition of a register.The following table shows the number of registers in several mainstream CPU architectures.the unified cache can be divided as 8 128-bit vector register or 32 32bit SIMD scalar register through bank renaming, no integer register found in this architecture.The Emotion Engine's main core (VU0) is a heavily modified DSP general core that's for general background task and it contains one 64 bit accumulator, two general data registers and one 32 bit program counter.
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A 16-bit wide, 32-bit address space stack machine processor from the Taiwanese company Sunplus Technology, it can be found on Vtech's V.