diff --git a/compiler/rustc_target/src/spec/targets/armv8r_none_eabihf.rs b/compiler/rustc_target/src/spec/targets/armv8r_none_eabihf.rs index 042a9a140710c..762084291a696 100644 --- a/compiler/rustc_target/src/spec/targets/armv8r_none_eabihf.rs +++ b/compiler/rustc_target/src/spec/targets/armv8r_none_eabihf.rs @@ -21,16 +21,16 @@ pub(crate) fn target() -> Target { linker: Some("rust-lld".into()), relocation_model: RelocModel::Static, panic_strategy: PanicStrategy::Abort, - // The Cortex-R52 has two variants with respect to floating-point support: - // 1. fp-armv8, SP-only, with 16 DP (32 SP) registers - // 2. neon-fp-armv8, SP+DP, with 32 DP registers - // Use the lesser of these two options as the default, as it will produce code - // compatible with either variant. + // Armv8-R requires a minimum set of floating-point features equivalent to: + // fp-armv8, SP-only, with 16 DP (32 SP) registers + // LLVM defines Armv8-R to include these features automatically. + // + // The Cortex-R52 supports these default features and optionally includes: + // neon-fp-armv8, SP+DP, with 32 DP registers // // Reference: // Arm Cortex-R52 Processor Technical Reference Manual // - Chapter 15 Advanced SIMD and floating-point support - features: "+fp-armv8,-fp64,-d32".into(), max_atomic_width: Some(64), emit_debug_gdb_scripts: false, // GCC defaults to 8 for arm-none here.