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| author | Trevor Gross <tmgross@umich.edu> | 2025-04-24 22:11:23 +0000 |
|---|---|---|
| committer | Trevor Gross <tmgross@umich.edu> | 2025-04-27 19:58:44 +0000 |
| commit | 6ceeb0849e181999fc6ecc2cb9dcfdc65b5effd3 (patch) | |
| tree | e38e3a25e8342dd26f2e715c1781c1714dc6d2cb /compiler/rustc_span/src | |
| parent | 555e1d0386f024a8359645c3217f4b3eae9be042 (diff) | |
| download | rust-6ceeb0849e181999fc6ecc2cb9dcfdc65b5effd3.tar.gz rust-6ceeb0849e181999fc6ecc2cb9dcfdc65b5effd3.zip | |
Implement the internal feature `cfg_target_has_reliable_f16_f128`
Support for `f16` and `f128` is varied across targets, backends, and backend versions. Eventually we would like to reach a point where all backends support these approximately equally, but until then we have to work around some of these nuances of support being observable. Introduce the `cfg_target_has_reliable_f16_f128` internal feature, which provides the following new configuration gates: * `cfg(target_has_reliable_f16)` * `cfg(target_has_reliable_f16_math)` * `cfg(target_has_reliable_f128)` * `cfg(target_has_reliable_f128_math)` `reliable_f16` and `reliable_f128` indicate that basic arithmetic for the type works correctly. The `_math` versions indicate that anything relying on `libm` works correctly, since sometimes this hits a separate class of codegen bugs. These options match configuration set by the build script at [1]. The logic for LLVM support is duplicated as-is from the same script. There are a few possible updates that will come as a follow up. The config introduced here is not planned to ever become stable, it is only intended to replace the build scripts for `std` tests and `compiler-builtins` that don't have any way to configure based on the codegen backend. MCP: https://github.com/rust-lang/compiler-team/issues/866 Closes: https://github.com/rust-lang/compiler-team/issues/866 [1]: https://github.com/rust-lang/rust/blob/555e1d0386f024a8359645c3217f4b3eae9be042/library/std/build.rs#L84-L186
Diffstat (limited to 'compiler/rustc_span/src')
| -rw-r--r-- | compiler/rustc_span/src/symbol.rs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs index 32a5aff0cb3..cd8f58ed735 100644 --- a/compiler/rustc_span/src/symbol.rs +++ b/compiler/rustc_span/src/symbol.rs @@ -623,6 +623,7 @@ symbols! { cfg_target_feature, cfg_target_has_atomic, cfg_target_has_atomic_equal_alignment, + cfg_target_has_reliable_f16_f128, cfg_target_thread_local, cfg_target_vendor, cfg_trace: "<cfg>", // must not be a valid identifier @@ -2073,6 +2074,10 @@ symbols! { target_has_atomic, target_has_atomic_equal_alignment, target_has_atomic_load_store, + target_has_reliable_f128, + target_has_reliable_f128_math, + target_has_reliable_f16, + target_has_reliable_f16_math, target_os, target_pointer_width, target_thread_local, |