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cpufeatures: Add support for LoongArch64
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| //! LoongArch64 CPU feature detection support. | ||
| //! | ||
| //! This implementation relies on OS-specific APIs for feature detection. | ||
| // Evaluate the given `$body` expression any of the supplied target features | ||
| // are not enabled. Otherwise returns true. | ||
| #[macro_export] | ||
| #[doc(hidden)] | ||
| macro_rules! __unless_target_features { | ||
| ($($tf:tt),+ => $body:expr ) => { | ||
| { | ||
| #[cfg(not(all($(target_feature=$tf,)*)))] | ||
| $body | ||
|
|
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| #[cfg(all($(target_feature=$tf,)*))] | ||
| true | ||
| } | ||
| }; | ||
| } | ||
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|
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| // Linux runtime detection of target CPU features using `getauxval`. | ||
| #[cfg(target_os = "linux")] | ||
| #[macro_export] | ||
| #[doc(hidden)] | ||
| macro_rules! __detect_target_features { | ||
| ($($tf:tt),+) => {{ | ||
| let hwcaps = $crate::loongarch64::getauxval_hwcap(); | ||
| $($crate::check!(hwcaps, $tf) & )+ true | ||
| }}; | ||
| } | ||
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| /// Linux helper function for calling `getauxval` to get `AT_HWCAP`. | ||
| #[cfg(target_os = "linux")] | ||
| pub fn getauxval_hwcap() -> u64 { | ||
| unsafe { libc::getauxval(libc::AT_HWCAP) } | ||
| } | ||
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|
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| // Linux `expand_check_macro` | ||
| #[cfg(target_os = "linux")] | ||
| macro_rules! __expand_check_macro { | ||
| ($(($name:tt, $hwcap:ident)),* $(,)?) => { | ||
| #[macro_export] | ||
| #[doc(hidden)] | ||
| macro_rules! check { | ||
| $( | ||
| ($hwcaps:expr, $name) => { | ||
| (($hwcaps & $crate::loongarch64::hwcaps::$hwcap) != 0) | ||
| }; | ||
| )* | ||
| } | ||
| }; | ||
| } | ||
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| // Linux `expand_check_macro` | ||
| #[cfg(target_os = "linux")] | ||
| __expand_check_macro! { | ||
| ("cpucfg", CPUCFG), // Enable CPUCFG support. | ||
| ("lam", LAM), // Enable LAM support. | ||
| ("ual", UAL), // Enable UAL support. | ||
| ("fpu", FPU), // Enable FPU support. | ||
| ("lsx", LSX), // Enable LSX support. | ||
| ("lasx", LASX), // Enable LASX support. | ||
| ("crc32", CRC32), // Enable CRC32 support. | ||
| ("complex", COMPLEX), // Enable COMPLEX support. | ||
| ("crypto", CRYPTO), // Enable CRYPTO support. | ||
| ("lvz", LVZ), // Enable LVZ support. | ||
| ("lbt.x86", LBT_X86), // Enable LBT_X86 support. | ||
| ("lbt.arm", LBT_ARM), // Enable LBT_ARM support. | ||
| ("lbt.mips", LBT_MIPS), // Enable LBT_MIPS support. | ||
| ("ptw", PTW), // Enable PTW support. | ||
| } | ||
|
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| /// Linux hardware capabilities mapped to target features. | ||
| /// | ||
| /// Note that LLVM target features are coarser grained than what Linux supports | ||
| /// and imply more capabilities under each feature. This module attempts to | ||
| /// provide that mapping accordingly. | ||
| #[cfg(target_os = "linux")] | ||
| pub mod hwcaps { | ||
| use libc::c_ulong; | ||
|
|
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| pub const CPUCFG: c_ulong = libc::HWCAP_CPUCFG; | ||
| pub const LAM: c_ulong = libc::HWCAP_LAM; | ||
| pub const UAL: c_ulong = libc::HWCAP_UAL; | ||
| pub const FPU: c_ulong = libc::HWCAP_FPU; | ||
| pub const LSX: c_ulong = libc::HWCAP_LSX; | ||
| pub const LASX: c_ulong = libc::HWCAP_LASX; | ||
| pub const CRC32: c_ulong = libc::HWCAP_CRC32; | ||
| pub const COMPLEX: c_ulong = libc::HWCAP_COMPLEX; | ||
| pub const CRYPTO: c_ulong = libc::HWCAP_CRYPTO; | ||
| pub const LVZ: c_ulong = libc::HWCAP_LVZ; | ||
| pub const LBT_X86: c_ulong = libc::HWCAP_LBT_X86; | ||
| pub const LBT_ARM: c_ulong = libc::HWCAP_LBT_ARM; | ||
| pub const LBT_MIPS: c_ulong = libc::HWCAP_LBT_MIPS; | ||
| pub const PTW: c_ulong = libc::HWCAP_PTW; | ||
| } | ||
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| // On other targets, runtime CPU feature detection is unavailable | ||
| #[cfg(not(target_os = "linux"))] | ||
| #[macro_export] | ||
| #[doc(hidden)] | ||
| macro_rules! __detect_target_features { | ||
| ($($tf:tt),+) => { | ||
| false | ||
| }; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| //! LoongArch64 tests | ||
| #![cfg(target_arch = "loongarch64")] | ||
|
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| cpufeatures::new!( | ||
| lacaps, "cpucfg", "lam", "ual", "fpu", "lsx", "lasx", "crc32", "complex", "crypto", "lvz", | ||
| "lbt.x86", "lbt.arm", "lbt.mips", "ptw" | ||
| ); | ||
|
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| #[test] | ||
| fn init() { | ||
| let token: lacaps::InitToken = lacaps::init(); | ||
| assert_eq!(token.get(), lacaps::get()); | ||
| } | ||
|
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| #[test] | ||
| fn init_get() { | ||
| let (token, val) = lacaps::init_get(); | ||
| assert_eq!(val, token.get()); | ||
| } |