diff options
| author | Jubilee <46493976+workingjubilee@users.noreply.github.com> | 2021-10-04 13:58:06 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-10-04 13:58:06 -0700 |
| commit | 4e9cf04c98dd65a7f4baedc2984fae18d5fecfd1 (patch) | |
| tree | 08e3d348f0cd16197d996b5fd27c549fabbac329 /compiler/rustc_codegen_llvm | |
| parent | 175b8db73bfd078b4bcd3c28c8d6f51d5895ebf3 (diff) | |
| parent | 0f9f241aac21bc77fb9e757da18207abefdc841d (diff) | |
| download | rust-4e9cf04c98dd65a7f4baedc2984fae18d5fecfd1.tar.gz rust-4e9cf04c98dd65a7f4baedc2984fae18d5fecfd1.zip | |
Rollup merge of #83655 - sebpop:arm64-outline-atomics, r=workingjubilee
[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')
| -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 c5deb11edd0..b15efcd0dc2 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 } |