386025117a
Implement StableHasher::write_u128 via write_u64 In https://github.com/rust-lang/rust/pull/110367#issuecomment-1510114777 the cachegrind diffs indicate that nearly all the regression is from this: ``` 22,892,558 ???:<rustc_data_structures::sip128::SipHasher128>::slice_write_process_buffer -9,502,262 ???:<rustc_data_structures::sip128::SipHasher128>::short_write_process_buffer::<8> ``` Which happens because the diff for that perf run swaps a `Hash::hash` of a `u64` to a `u128`. But `slice_write_process_buffer` is a `#[cold]` function, and is for handling hashes of arbitrary-length byte arrays. Using the much more optimizer-friendly `u64` path twice to hash a `u128` provides a nice perf boost in some benchmarks. |
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rustc | ||
rustc_abi | ||
rustc_apfloat | ||
rustc_arena | ||
rustc_ast | ||
rustc_ast_lowering | ||
rustc_ast_passes | ||
rustc_ast_pretty | ||
rustc_attr | ||
rustc_baked_icu_data | ||
rustc_borrowck | ||
rustc_builtin_macros | ||
rustc_codegen_cranelift | ||
rustc_codegen_gcc | ||
rustc_codegen_llvm | ||
rustc_codegen_ssa | ||
rustc_const_eval | ||
rustc_data_structures | ||
rustc_driver | ||
rustc_driver_impl | ||
rustc_error_codes | ||
rustc_error_messages | ||
rustc_errors | ||
rustc_expand | ||
rustc_feature | ||
rustc_fs_util | ||
rustc_graphviz | ||
rustc_hir | ||
rustc_hir_analysis | ||
rustc_hir_pretty | ||
rustc_hir_typeck | ||
rustc_incremental | ||
rustc_index | ||
rustc_infer | ||
rustc_interface | ||
rustc_lexer | ||
rustc_lint | ||
rustc_lint_defs | ||
rustc_llvm | ||
rustc_log | ||
rustc_macros | ||
rustc_metadata | ||
rustc_middle | ||
rustc_mir_build | ||
rustc_mir_dataflow | ||
rustc_mir_transform | ||
rustc_monomorphize | ||
rustc_parse | ||
rustc_parse_format | ||
rustc_passes | ||
rustc_plugin_impl | ||
rustc_privacy | ||
rustc_query_impl | ||
rustc_query_system | ||
rustc_resolve | ||
rustc_serialize | ||
rustc_session | ||
rustc_smir | ||
rustc_span | ||
rustc_symbol_mangling | ||
rustc_target | ||
rustc_trait_selection | ||
rustc_traits | ||
rustc_transmute | ||
rustc_ty_utils | ||
rustc_type_ir |