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The RISC-V Instruction Set Manual
riscv.orgDec 13, 2019 · The RISC-V Instruction Set Manual Volume I: Unprivileged ISA Document Version 20191213 Editors: Andrew Waterman 1, Krste Asanovi´c,2 1SiFive Inc., 2CS Division, EECS Department, University of California, Berkeley andrew@sifive.com, krste@berkeley.edu
The RISC-V Instruction Set Manual
inst.eecs.berkeley.eduISA extension described in the following section reduces code size by providing compressed 16-bit instructions and relaxes the alignment constraints to allow all instructions (16 bit and 32 bit) to be aligned on any 16-bit boundary to improve code density. Figure 2 illustrates the RISC-V instruction length encoding convention.
The RISC-V Instruction Set Manual Volume I: User-Level ISA ...
riscv.orgstruction extension. AMOs and LR/SC can support the release consistency model. The FENCE instruction provides ner-grain memory and I/O orderings. An AMO for fetch-and-XOR (AMOXOR) has been added, and the encoding for AMOSWAP has been changed to make room. The AUIPC instruction, which adds a 20-bit upper immediate to the PC, replaces the RDNPC
RISC-V Instruction Formats
inst.eecs.berkeley.eduRISC-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