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・ amd 29027
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AMD 29000 : FOLDOC
AMD 29000
A RISC microprocessor descended from the {Berkley RISC} design. Like the SPARC design that was introduced shortly afterward, the 29000 has a large register set split into local and global sets. But though it was introduced before the SPARC, it has a more elegant method of register management.
The 29000 has 64 global registers, in comparison to the SPARC's eight. In addition, the 29000 allows variable sized windows allocated from the 128 register stack cache. The current window or stack frame is indicated by a stack pointer, a pointer to the caller's frame is stored in the current frame, like in an ordinary stack (directly supporting stack languages like C, a CISC-like philosophy). Spills and fills occur only at the ends of the cache, and registers are saved/loaded from the memory stack. This allows variable window sizes, from 1 to 128 registers. This flexibility, plus the large set of global registers, makes register allocation easi


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