reword RISC-V feature documentation

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)

Author: a4lg

crates/std_detect/src/detect/arch/riscv.rs

@@ -105,116 +105,116 @@ features! {
 
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zicsr: "zicsr";
     without cfg check: true;
-    /// "Zicsr", Control and Status Register (CSR) Instructions
+    /// "Zicsr" Extension for Control and Status Register (CSR) Instructions
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zicntr: "zicntr";
     without cfg check: true;
-    /// "Zicntr", Standard Extension for Base Counters and Timers
+    /// "Zicntr" Extension for Base Counters and Timers
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zihpm: "zihpm";
     without cfg check: true;
-    /// "Zihpm", Standard Extension for Hardware Performance Counters
+    /// "Zihpm" Extension for Hardware Performance Counters
 
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zifencei: "zifencei";
     without cfg check: true;
-    /// "Zifencei" Instruction-Fetch Fence
+    /// "Zifencei" Extension for Instruction-Fetch Fence
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zihintpause: "zihintpause";
     without cfg check: true;
-    /// "Zihintpause" Pause Hint
+    /// "Zihintpause" Extension for Pause Hint
 
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] m: "m";
-    /// "M" Standard Extension for Integer Multiplication and Division
+    /// "M" Extension for Integer Multiplication and Division
 
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] a: "a";
-    /// "A" Standard Extension for Atomic Instructions
+    /// "A" Extension for Atomic Instructions
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zam: "zam";
     without cfg check: true;
-    /// "Zam" Standard Extension for Misaligned Atomics
+    /// "Zam" Extension for Misaligned Atomics
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] ztso: "ztso";
     without cfg check: true;
-    /// "Ztso" Standard Extension for Total Store Ordering
+    /// "Ztso" Extension for Total Store Ordering
 
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] f: "f";
-    /// "F" Standard Extension for Single-Precision Floating-Point
+    /// "F" Extension for Single-Precision Floating-Point
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] d: "d";
-    /// "D" Standard Extension for Double-Precision Floating-Point
+    /// "D" Extension for Double-Precision Floating-Point
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] q: "q";
     without cfg check: true;
-    /// "Q" Standard Extension for Quad-Precision Floating-Point
+    /// "Q" Extension for Quad-Precision Floating-Point
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zfh: "zfh";
-    /// "Zfh" Standard Extension for 16-Bit Half-Precision Floating-Point
+    /// "Zfh" Extension for Half-Precision Floating-Point
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zfhmin: "zfhmin";
-    /// "Zfhmin" Standard Extension for Minimal Half-Precision Floating-Point Support
+    /// "Zfhmin" Extension for Minimal Half-Precision Floating-Point
 
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zfinx: "zfinx";
-    /// "Zfinx" Standard Extension for Single-Precision Floating-Point in Integer Registers
+    /// "Zfinx" Extension for Single-Precision Floating-Point in Integer Registers
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zdinx: "zdinx";
-    /// "Zdinx" Standard Extension for Double-Precision Floating-Point in Integer Registers
+    /// "Zdinx" Extension for Double-Precision Floating-Point in Integer Registers
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zhinx: "zhinx";
-    /// "Zhinx" Standard Extension for Half-Precision Floating-Point in Integer Registers
+    /// "Zhinx" Extension for Half-Precision Floating-Point in Integer Registers
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] zhinxmin: "zhinxmin";
-    /// "Zhinxmin" Standard Extension for Minimal Half-Precision Floating-Point in Integer Registers
+    /// "Zhinxmin" Extension for Minimal Half-Precision Floating-Point in Integer Registers
 
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] c: "c";
-    /// "C" Standard Extension for Compressed Instructions
+    /// "C" Extension for Compressed Instructions
 
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zba: "zba";
-    /// "Zba" Standard Extension for Address Generation Instructions
+    /// "Zba" Extension for Address Generation
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zbb: "zbb";
-    /// "Zbb" Standard Extension for Basic Bit-Manipulation
+    /// "Zbb" Extension for Basic Bit-Manipulation
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zbc: "zbc";
-    /// "Zbc" Standard Extension for Carry-less Multiplication
+    /// "Zbc" Extension for Carry-less Multiplication
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zbs: "zbs";
-    /// "Zbs" Standard Extension for Single-Bit instructions
+    /// "Zbs" Extension for Single-Bit instructions
 
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zbkb: "zbkb";
-    /// "Zbkb" Standard Extension for Bitmanip instructions for Cryptography
+    /// "Zbkb" Extension for Bit-manipulation for Cryptography
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zbkc: "zbkc";
-    /// "Zbkc" Standard Extension for Carry-less multiply instructions
+    /// "Zbkc" Extension for Carry-less multiplication for Cryptography
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zbkx: "zbkx";
-    /// "Zbkx" Standard Extension for Crossbar permutation instructions
+    /// "Zbkx" Extension for Crossbar permutations
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zknd: "zknd";
-    /// "Zknd" Standard Extension for NIST Suite: AES Decryption
+    /// "Zknd" Cryptography Extension for NIST Suite: AES Decryption
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zkne: "zkne";
-    /// "Zkne" Standard Extension for NIST Suite: AES Encryption
+    /// "Zkne" Cryptography Extension for NIST Suite: AES Encryption
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zknh: "zknh";
-    /// "Zknh" Standard Extension for NIST Suite: Hash Function Instructions
+    /// "Zknh" Cryptography Extension for NIST Suite: Hash Function Instructions
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zksed: "zksed";
-    /// "Zksed" Standard Extension for ShangMi Suite: SM4 Block Cipher Instructions
+    /// "Zksed" Cryptography Extension for ShangMi Suite: SM4 Block Cipher Instructions
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zksh: "zksh";
-    /// "Zksh" Standard Extension for ShangMi Suite: SM3 Hash Function Instructions
+    /// "Zksh" Cryptography Extension for ShangMi Suite: SM3 Hash Function Instructions
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zkr: "zkr";
-    /// "Zkr" Standard Extension for Entropy Source Extension
+    /// "Zkr" Entropy Source Extension
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zkn: "zkn";
-    /// "Zkn" Standard Extension for NIST Algorithm Suite
+    /// "Zkn" Cryptography Extension for NIST Algorithm Suite
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zks: "zks";
-    /// "Zks" Standard Extension for ShangMi Algorithm Suite
+    /// "Zks" Cryptography Extension for ShangMi Algorithm Suite
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zk: "zk";
-    /// "Zk" Standard Extension for Standard scalar cryptography extension
+    /// "Zk" Cryptography Extension for Standard scalar cryptography
     @FEATURE: #[stable(feature = "riscv_ratified", since = "1.78.0")] zkt: "zkt";
-    /// "Zkt" Standard Extension for Data Independent Execution Latency
+    /// "Zkt" Cryptography Extension for Data Independent Execution Latency
 
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] v: "v";
-    /// "V" Standard Extension for Vector Operations
+    /// "V" Extension for Vector Operations
 
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] svnapot: "svnapot";
     without cfg check: true;
-    /// "Svnapot" Standard Extension for NAPOT Translation Contiguity
+    /// "Svnapot" Extension for NAPOT Translation Contiguity
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] svpbmt: "svpbmt";
     without cfg check: true;
-    /// "Svpbmt" Standard Extension for Page-Based Memory Types
+    /// "Svpbmt" Extension for Page-Based Memory Types
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] svinval: "svinval";
     without cfg check: true;
-    /// "Svinval" Standard Extension for Fine-Grained Address-Translation Cache Invalidation
+    /// "Svinval" Extension for Fine-Grained Address-Translation Cache Invalidation
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] h: "h";
     without cfg check: true;
-    /// Hypervisor Extension
+    /// "H" Extension for Hypervisor Support
 
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] s: "s";
     without cfg check: true;
     /// Supervisor-Level ISA
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] j: "j";
     without cfg check: true;
-    /// "J" Standard Extension for Dynamically Translated Languages
+    /// "J" Extension for Dynamically Translated Languages
     @FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] p: "p";
     without cfg check: true;
-    /// "P" Standard Extension for Packed-SIMD Instructions
+    /// "P" Extension for Packed-SIMD Instructions
 }