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RISC-V Instruction Formats

RISC-V Instruction FormatsInstructor: Steven HoWe__are__ Great Idea #1: Levels of Representation/Interpretation6/27/2018CS 61C Su18 - Lecture 72lw t0, 0(x2)lw t1, 4(x2)sw t1, 0(x2)sw t0, 4(x2)Higher-Level LanguageProgram ( C)Assembly Language Program ( RISCV)Machine Language Program (RISCV)Hardware Architecture Description( block diagrams) CompilerAssemblerMachine Interpretationtemp = v[k];v[k] = v[k+1];v[k+1] = temp;0000 1001 1100 0110 1010 1111 0101 10001010 1111 0101 1000 0000 1001 1100 0110 1100 0110 1010 1111 0101 1000 0000 1001 0101 1000 0000 1001 1100 0110 1010 1111 Logic Circuit Description(Circuit Schematic Diagrams)Architecture ImplementationWe__are__ Stored-Program Concept R-Format I-Format Administrivia S-Format SB-Format U-Fo

RISC-V Feature, n×16-bit instructions • Extensions to RISC-V base ISA support 16-bit compressed instructions and also variable-length instructions that are multiples of 16-bits in length • 16-bit = half-word • To enable this, RISC-V scales the branch offset to be half-words even when there are no 16-bit instructions

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