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std_detect: RISC-V platform guide documentation (non-table part)

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This is a partial revert of a revert, making the
commit e907456b2e10622ccd854a3bba8d02ce170b5dbb come around again
for non-table part.
This commit is contained in:
Tsukasa OI 2025-04-30 05:42:42 +00:00 • committed by Amanieu d'Antras
parent b58ce625a2
commit 08484b5e7a
1 changed files with 15 additions and 0 deletions
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15
library/stdarch/crates/std_detect/src/detect/arch/riscv.rs
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@ -22,6 +22,19 @@ features! {
///
/// [ISA manual]: https://riscv.org/specifications/ratified/
///
/// # Platform-specific/agnostic Behavior and Availability
///
/// Runtime detection depends on the platform-specific feature detection
/// facility and its availability per feature is
/// highly platform/version-specific.
///
/// Still, a best-effort attempt is performed to enable subset/dependent
/// features if a superset feature is enabled regardless of the platform.
/// For instance, if the A extension (`"a"`) is enabled, its subsets (the
/// Zalrsc and Zaamo extensions; `"zalrsc"` and `"zaamo"`) are also enabled.
/// Likewise, if the F extension (`"f"`) is enabled, one of its dependencies
/// (the Zicsr extension `"zicsr"`) is also enabled.
///
/// # Unprivileged Specification
///
/// The supported ratified RISC-V instruction sets are as follows:
@ -122,7 +135,9 @@ features! {
/// corresponding unaligned memory access is reasonably fast.
///
/// * `"unaligned-scalar-mem"`
/// * Runtime detection requires Linux kernel version 6.4 or later.
/// * `"unaligned-vector-mem"`
/// * Runtime detection requires Linux kernel version 6.13 or later.
#[stable(feature = "riscv_ratified", since = "1.78.0")]
@FEATURE: #[unstable(feature = "stdarch_riscv_feature_detection", issue = "111192")] rv32i: "rv32i";