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| author | Jörn Horstmann <git@jhorstmann.net> | 2024-04-10 22:22:18 +0200 |
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| committer | Jörn Horstmann <git@jhorstmann.net> | 2024-09-23 11:31:29 +0200 |
| commit | e393f56d37857d3b690b687fe54e8413bb9d5b3a (patch) | |
| tree | 0b73ce9cb81517c1ffec620db2c1d10f6b6bbbe0 /compiler/rustc_codegen_llvm/src | |
| parent | 702987f75b74f789ba227ee04a3d7bb1680c2309 (diff) | |
| download | rust-e393f56d37857d3b690b687fe54e8413bb9d5b3a.tar.gz rust-e393f56d37857d3b690b687fe54e8413bb9d5b3a.zip | |
Improve autovectorization of to_lowercase / to_uppercase functions
Refactor the code in the `convert_while_ascii` helper function to make it more suitable for auto-vectorization and also process the full ascii prefix of the string. The generic case conversion logic will only be invoked starting from the first non-ascii character. The runtime on microbenchmarks with ascii-only inputs improves between 1.5x for short and 4x for long inputs on x86_64 and aarch64. The new implementation also encapsulates all unsafe inside the `convert_while_ascii` function. Fixes #123712
Diffstat (limited to 'compiler/rustc_codegen_llvm/src')
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