diff options
| author | Nicholas Nethercote <nnethercote@mozilla.com> | 2019-05-02 20:34:26 +1000 |
|---|---|---|
| committer | Nicholas Nethercote <nnethercote@mozilla.com> | 2019-05-02 20:47:20 +1000 |
| commit | 6ef39e69eac42e1cc86ec8eeb1b85c6b3a8784fa (patch) | |
| tree | 2ae27dc2fd60df15ec3c7361e4bcdefdefcb57ee /src/librustc_codegen_llvm/debuginfo/mod.rs | |
| parent | 03122e1bac482b150844ef9664b1ad2438b43072 (diff) | |
| download | rust-6ef39e69eac42e1cc86ec8eeb1b85c6b3a8784fa.tar.gz rust-6ef39e69eac42e1cc86ec8eeb1b85c6b3a8784fa.zip | |
Avoid repeated interning of static strings.
`file_metadata_raw` interns the strings `"<unknown>"` and `""` very frequently. This commit avoids that, which reduces the number of symbols interned significantly and reduces instruction counts by up to 0.5% on some workloads.
Diffstat (limited to 'src/librustc_codegen_llvm/debuginfo/mod.rs')
| -rw-r--r-- | src/librustc_codegen_llvm/debuginfo/mod.rs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_codegen_llvm/debuginfo/mod.rs b/src/librustc_codegen_llvm/debuginfo/mod.rs index 2154ac9b1d2..f3070a03b4e 100644 --- a/src/librustc_codegen_llvm/debuginfo/mod.rs +++ b/src/librustc_codegen_llvm/debuginfo/mod.rs @@ -63,7 +63,7 @@ pub struct CrateDebugContext<'a, 'tcx> { llcontext: &'a llvm::Context, llmod: &'a llvm::Module, builder: &'a mut DIBuilder<'a>, - created_files: RefCell<FxHashMap<(Symbol, Symbol), &'a DIFile>>, + created_files: RefCell<FxHashMap<(Option<Symbol>, Option<Symbol>), &'a DIFile>>, created_enum_disr_types: RefCell<FxHashMap<(DefId, layout::Primitive), &'a DIType>>, type_map: RefCell<TypeMap<'a, 'tcx>>, |