diff options
Diffstat (limited to 'compiler/rustc_target/src/target_features.rs')
| -rw-r--r-- | compiler/rustc_target/src/target_features.rs | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/compiler/rustc_target/src/target_features.rs b/compiler/rustc_target/src/target_features.rs index 717e64fe6c8..d5da130aa6c 100644 --- a/compiler/rustc_target/src/target_features.rs +++ b/compiler/rustc_target/src/target_features.rs @@ -32,6 +32,8 @@ pub enum Stability<AllowToggle> { /// This target feature is unstable. It is only present in `#[cfg(target_feature)]` on /// nightly and using it in `#[target_feature]` requires enabling the given nightly feature. Unstable { + /// This must be a *language* feature, or else rustc will ICE when reporting a missing + /// feature gate! nightly_feature: Symbol, /// See `Stable::allow_toggle` comment above. allow_toggle: AllowToggle, @@ -168,6 +170,22 @@ const ARM_FEATURES: &[(&str, StabilityUncomputed, ImpliedFeatures)] = &[ ("dotprod", unstable(sym::arm_target_feature), &["neon"]), ("dsp", unstable(sym::arm_target_feature), &[]), ("fp-armv8", unstable(sym::arm_target_feature), &["vfp4"]), + ( + "fpregs", + Stability::Unstable { + nightly_feature: sym::arm_target_feature, + allow_toggle: |target: &Target| { + // Only allow toggling this if the target has `soft-float` set. With `soft-float`, + // `fpregs` isn't needed so changing it cannot affect the ABI. + if target.has_feature("soft-float") { + Ok(()) + } else { + Err("unsound on hard-float targets because it changes float ABI") + } + }, + }, + &[], + ), ("i8mm", unstable(sym::arm_target_feature), &["neon"]), ("mclass", unstable(sym::arm_target_feature), &[]), ("neon", unstable(sym::arm_target_feature), &["vfp3"]), @@ -191,7 +209,6 @@ const ARM_FEATURES: &[(&str, StabilityUncomputed, ImpliedFeatures)] = &[ ("vfp4", unstable(sym::arm_target_feature), &["vfp3"]), ("virtualization", unstable(sym::arm_target_feature), &[]), // tidy-alphabetical-end - // FIXME: need to also forbid turning off `fpregs` on hardfloat targets ]; const AARCH64_FEATURES: &[(&str, StabilityUncomputed, ImpliedFeatures)] = &[ @@ -450,13 +467,28 @@ const X86_FEATURES: &[(&str, StabilityUncomputed, ImpliedFeatures)] = &[ ("tbm", unstable(sym::tbm_target_feature), &[]), ("vaes", unstable(sym::avx512_target_feature), &["avx2", "aes"]), ("vpclmulqdq", unstable(sym::avx512_target_feature), &["avx", "pclmulqdq"]), + ( + "x87", + Stability::Unstable { + nightly_feature: sym::x87_target_feature, + allow_toggle: |target: &Target| { + // Only allow toggling this if the target has `soft-float` set. With `soft-float`, + // `fpregs` isn't needed so changing it cannot affect the ABI. + if target.has_feature("soft-float") { + Ok(()) + } else { + Err("unsound on hard-float targets because it changes float ABI") + } + }, + }, + &[], + ), ("xop", unstable(sym::xop_target_feature), &[/*"fma4", */ "avx", "sse4a"]), ("xsave", STABLE, &[]), ("xsavec", STABLE, &["xsave"]), ("xsaveopt", STABLE, &["xsave"]), ("xsaves", STABLE, &["xsave"]), // tidy-alphabetical-end - // FIXME: need to also forbid turning off `x87` on hardfloat targets ]; const HEXAGON_FEATURES: &[(&str, StabilityUncomputed, ImpliedFeatures)] = &[ |