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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.
Note that in x86-compatible processors the stack pointer () is counted as an integer register, even though there are a limited number of instructions that may be used to operate on its contents. Although all of the above listed architectures are different, almost all are a basic arrangement known as the Von Neumann architecture, first proposed by the Hungarian-American mathematician John von Neumann.
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.
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.
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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 instruction sets, the registers can operate in various modes breaking down its storage memory into smaller ones (32-bit into four 8-bit one for instance) to which multiple data (vector, or one dimensional array of data) can be loaded and operated upon at the same time.