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| author | Sebastian Pop <spop@amazon.com> | 2021-04-05 17:17:23 +0000 |
|---|---|---|
| committer | Sebastian Pop <spop@amazon.com> | 2021-09-30 23:34:33 +0000 |
| commit | 0f9f241aac21bc77fb9e757da18207abefdc841d (patch) | |
| tree | 2962afb37fc14dbda6cbe54e54453b6d31893aad /compiler/rustc_codegen_llvm/src | |
| parent | 3e8f32e1c52ca493c862facb7a69e7c3f1f97a18 (diff) | |
| download | rust-0f9f241aac21bc77fb9e757da18207abefdc841d.tar.gz rust-0f9f241aac21bc77fb9e757da18207abefdc841d.zip | |
[aarch64] add target feature outline-atomics
Enable outline-atomics by default as enabled in clang by the following commit https://reviews.llvm.org/rGc5e7e649d537067dec7111f3de1430d0fc8a4d11 Performance improves by several orders of magnitude when using the LSE instructions instead of the ARMv8.0 compatible load/store exclusive instructions. Tested on Graviton2 aarch64-linux with x.py build && x.py install && x.py test
Diffstat (limited to 'compiler/rustc_codegen_llvm/src')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/llvm_util.rs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs index f9172e43773..2d053abd44e 100644 --- a/compiler/rustc_codegen_llvm/src/llvm_util.rs +++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs @@ -416,6 +416,11 @@ pub fn llvm_global_features(sess: &Session) -> Vec<String> { // -Ctarget-features features.extend(sess.opts.cg.target_feature.split(',').flat_map(&filter)); + // FIXME: Move outline-atomics to target definition when earliest supported LLVM is 12. + if get_version() >= (12, 0, 0) && sess.target.llvm_target.contains("aarch64-unknown-linux") { + features.push("+outline-atomics".to_string()); + } + features } |