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As the version 20240411 of the RISC-V ISA Manual changed wording to
describe many of the standard extensions, this commit largely follows this
scheme in general. In many cases, words "Standard Extension" are replaced
with "Extension" following the latest ratified ISA Manual.
Some RISC-V extensions had tentative summary but it also fixes that
(e.g. "Zihintpause").
Following extensions are described in parity with corresponding extensions
using floating-point registers:
* "Zfinx" Extension for Single-Precision Floating-Point in Integer Registers
* "Zdinx" Extension for Double-Precision Floating-Point in Integer Registers
* "Zhinx" Extension for Half-Precision Floating-Point in Integer Registers
* "Zhinxmin" Extension for Minimal Half-Precision Floating-Point in Integer Registers
Following extensions are named against the ISA Manual naming but
considered inconsistency inside the ISA manual:
* "Zfhmin" Extension for Minimal Half-Precision Floating-Point
ISA Manual: "Zfhmin" Standard Extension for Minimal Half-Precision Floating-Point
* "V" Extension for Vector Operations
ISA Manual: "V" Standard Extension for Vector Operations
Following extension is removed from the latest ratified ISA Manual but
named like others:
* "Zam" Extension for Misaligned Atomics
"Zb*" extensions are described like "Extension for ..." using partial
summary per extension (including cryptography-related "Zbk*" extensions).
"Zk*" extensions are described like "Cryptography Extension for ..." using
partial summary per extension (e.g. 'Zkne - NIST Suite: AES Encryption' in
the ISA Manual to '"Zkne" Cryptography Extension for NIST Suite: AES
Encryption') except following extensions:
* "Zkr" Entropy Source Extension
Following the general rule will make the description redundant.
* "Zk" Cryptography Extension for Standard scalar cryptography
The last word "extension" is removed as seemed redundant.
Link:
<https://lf-riscv.atlassian.net/wiki/spaces/HOME/pages/16154769/RISC-V+Technical+Specifications>
(ISA Specifications, Version 20240411; published in May 2024)