The art of ISA design is the fine balance between gaining performance advantages and enhanced usability
The topic of RISC-V custom instructions is growing in importance. This article explains why this subject is becoming so significant, and outlines some of the previous approaches to processor hardware and software optimization to illustrate the techniques that are now possible with RISC-V.
RISC-V is an open ISA (Instruction Set Architecture) that defines the boundary between hardware of the processor design and the software that it will execute, such as operating systems and application programs. In traditional or closed source ISAs the structure and future roadmap is tightly controlled and guided in a particular direction…
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