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Allow mapping a runtime feature to a set of target_features (#1311)

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Adam Gemmell 2022-07-02 00:55:03 +01:00 • committed by GitHub
parent b186197c7c
commit ba9ca43154
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2 changed files with 17 additions and 4 deletions
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3
library/stdarch/crates/std_detect/src/detect/arch/aarch64.rs
View file

@ -72,7 +72,8 @@ features! {
@FEATURE: #[stable(feature = "simd_aarch64", since = "1.60.0")] pmull: "pmull";
/// FEAT_PMULL (Polynomial Multiply)
@FEATURE: #[stable(feature = "simd_aarch64", since = "1.60.0")] fp: "fp";
/// FEAT_FP (Floating point support)
implied by target_features: ["neon"];
/// FEAT_FP (Floating point support) - Implied by `neon` target_feature
@FEATURE: #[stable(feature = "simd_aarch64", since = "1.60.0")] fp16: "fp16";
/// FEAT_FP16 (Half-float support)
@FEATURE: #[stable(feature = "simd_aarch64", since = "1.60.0")] sve: "sve";

18
library/stdarch/crates/std_detect/src/detect/macros.rs
View file

@ -1,3 +1,14 @@
#[macro_export]
macro_rules! detect_feature {
($feature:tt, $feature_lit:tt) => {
$crate::detect_feature!($feature, $feature_lit : $feature_lit)
};
($feature:tt, $feature_lit:tt : $($target_feature_lit:tt),*) => {
$(cfg!(target_feature = $target_feature_lit) ||)*
$crate::detect::__is_feature_detected::$feature()
};
}
#[allow(unused)]
macro_rules! features {
(
@ -7,7 +18,9 @@ macro_rules! features {
@MACRO_ATTRS: $(#[$macro_attrs:meta])*
$(@BIND_FEATURE_NAME: $bind_feature:tt; $feature_impl:tt; )*
$(@NO_RUNTIME_DETECTION: $nort_feature:tt; )*
$(@FEATURE: #[$stability_attr:meta] $feature:ident: $feature_lit:tt; $(#[$feature_comment:meta])*)*
$(@FEATURE: #[$stability_attr:meta] $feature:ident: $feature_lit:tt;
$(implied by target_features: [$($target_feature_lit:tt),*];)?
$(#[$feature_comment:meta])*)*
) => {
#[macro_export]
$(#[$macro_attrs])*
@ -17,8 +30,7 @@ macro_rules! features {
macro_rules! $macro_name {
$(
($feature_lit) => {
cfg!(target_feature = $feature_lit) ||
$crate::detect::__is_feature_detected::$feature()
$crate::detect_feature!($feature, $feature_lit $(: $($target_feature_lit),*)?)
};
)*
$(