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936a8232df
rust/compiler/rustc_codegen_llvm
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Nicholas Nethercote 936a8232df Change signature of target_features_cfg. 
Currently it is called twice, once with `allow_unstable` set to true and
once with it set to false. This results in some duplicated work. Most
notably, for the LLVM backend, `LLVMRustHasFeature` is called twice for
every feature, and it's moderately slow. For very short running
compilations on platforms with many features (e.g. a `check` build of
hello-world on x86) this is a significant fraction of runtime.

This commit changes `target_features_cfg` so it is only called once, and
it now returns a pair of feature sets. This halves the number of
`LLVMRustHasFeature` calls.
2025-03-05 09:49:17 +11:00
..
src Change signature of target_features_cfg. 2025-03-05 09:49:17 +11:00
Cargo.toml Upgrade the compiler to edition 2024 2025-02-22 00:01:48 +00:00
messages.ftl update autodiff flags 2025-02-21 21:51:20 -05:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

The codegen crate contains the code to convert from MIR into LLVM IR, and then from LLVM IR into machine code. In general it contains code that runs towards the end of the compilation process.

For more information about how codegen works, see the rustc dev guide.