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Diffstat (limited to 'third_party/rust/any_all_workaround/README.md')
| -rw-r--r-- | third_party/rust/any_all_workaround/README.md | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/third_party/rust/any_all_workaround/README.md b/third_party/rust/any_all_workaround/README.md new file mode 100644 index 0000000000..9f83ac3695 --- /dev/null +++ b/third_party/rust/any_all_workaround/README.md @@ -0,0 +1,13 @@ +# any_all_workaround + +This is a workaround for bad codegen ([Rust bug](https://github.com/rust-lang/portable-simd/issues/146), [LLVM bug](https://github.com/llvm/llvm-project/issues/50466)) for the `any()` and `all()` reductions for NEON-backed SIMD vectors on 32-bit ARM. On other platforms these delegate to `any()` and `all()` in `core::simd`. + +The plan is to abandon this crate once the LLVM bug is fixed or `core::simd` works around the LLVM bug. + +The code is forked from the [`packed_simd` crate](https://raw.githubusercontent.com/hsivonen/packed_simd/d938e39bee9bc5c222f5f2f2a0df9e53b5ce36ae/src/codegen/reductions/mask/arm.rs). + +This crate requires Nightly Rust as it depends on the `portable_simd` feature. + +# License + +`MIT OR Apache-2.0`, since that's how `packed_simd` is licensed. (The ARM intrinsics Rust version workaround is from qcms, see LICENSE-MIT-QCMS.) |