rust - https://github.com/rust-lang/rust

Age	Commit message (Collapse)	Author	Lines
2025-05-06	Require `target_has_atomic = "ptr"` for runtime feature detection	Trevor Gross	-3/+7
	The `feature_detect` module is currently being built on all targets, but the use of `AtomicU32` causes a problem if atomics are not available (such as with `bpfel-unknown-none`). Gate this module behind `target_has_atomic = "ptr"`. The below now completes successfully: cargo build -p compiler_builtins --target=bpfel-unknown-none -Z build-std=core Fixes: https://github.com/rust-lang/compiler-builtins/issues/908
2025-05-03	Use runtime feature detection for fma routines on x86	Trevor Gross	-0/+363
	Get performance closer to the glibc implementations by adding assembly fma routines, with runtime feature detection so they are used even if not compiled with `+fma` (as the distributed standard library is often not). Glibc uses ifuncs, this implementation stores a function pointer in an atomic. Results of CPU flags are also cached in order to avoid repeating the startup time in calls to different functions. The feature detection code is a slightly simplified version of `std-detect`. Musl sources were used as a reference [1]. Fixes: https://github.com/rust-lang/rust/issues/140452 once synced [1]: https://github.com/bminor/musl/blob/c47ad25ea3b484e10326f933e927c0bc8cded3da/src/math/x32/fma.c