Use WASM's saturating casts if they are available #73724
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r? @eddyb (rust_highfive has picked a reviewer for you, use r? to override) |
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Thanks! Could a test be added for this as well? Ideally we'd have both a codegen test and a functionality-based test. For a functionality-based test you could add something to src/test/ui with // only-wasm (I think) which has a // compile-flags: -Ctarget-feature=+nontrapping-fptoint directive. For a codegen test you'd have to explore the src/test/codegen directory a bit, I'm not sure how that works for codegen tests that only apply to one architecture. I can help out though if issues arise!
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I added the codegen test. Not sure what UI test I should create here. Seems like UI tests are mostly about checking for compiler errors and such, but there's not really any. |
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@bors: r+ Thanks so much for this! |
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…crichton Use WASM's saturating casts if they are available WebAssembly supports saturating floating point to integer casts behind a target feature. The feature is already available on many browsers. Beginning with 1.45 Rust will start defining the behavior of floating point to integer casts to be saturating as well. For this Rust constructs additional checks on top of the `fptoui` / `fptosi` instructions it emits. Here we introduce the possibility for the codegen backend to construct saturating casts itself and only fall back to constructing the checks ourselves if that is not possible. Resolves part of rust-lang#73591
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…crichton Use WASM's saturating casts if they are available WebAssembly supports saturating floating point to integer casts behind a target feature. The feature is already available on many browsers. Beginning with 1.45 Rust will start defining the behavior of floating point to integer casts to be saturating as well. For this Rust constructs additional checks on top of the `fptoui` / `fptosi` instructions it emits. Here we introduce the possibility for the codegen backend to construct saturating casts itself and only fall back to constructing the checks ourselves if that is not possible. Resolves part of rust-lang#73591
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WebAssembly supports saturating floating point to integer casts behind a target feature. The feature is already available on many browsers. Beginning with 1.45 Rust will start defining the behavior of floating point to integer casts to be saturating as well. For this Rust constructs additional checks on top of the `fptoui` / `fptosi` instructions it emits. Here we introduce the possibility for the codegen backend to construct saturating casts itself and only fall back to constructing the checks ourselves if that is not possible.
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I rebased the commits onto the latest master. |
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@bors: r+ |
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📌 Commit 838c497 has been approved by |
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…crichton Use WASM's saturating casts if they are available WebAssembly supports saturating floating point to integer casts behind a target feature. The feature is already available on many browsers. Beginning with 1.45 Rust will start defining the behavior of floating point to integer casts to be saturating as well. For this Rust constructs additional checks on top of the `fptoui` / `fptosi` instructions it emits. Here we introduce the possibility for the codegen backend to construct saturating casts itself and only fall back to constructing the checks ourselves if that is not possible. Resolves part of rust-lang#73591
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…arth Rollup of 8 pull requests Successful merges: - rust-lang#73454 (Move contributing.md to rustc-dev-guide and point at getting started) - rust-lang#73724 (Use WASM's saturating casts if they are available) - rust-lang#73726 (resolve: disallow labelled breaks/continues through closures/async blocks) - rust-lang#73753 (Use 'tcx for references to AccessLevels wherever possible.) - rust-lang#73781 (Update psm version) - rust-lang#73952 (Add option for local docker testing.) - rust-lang#73957 (disable BTree min_max test in Miri for now) - rust-lang#73975 (Document rustc_ast::ast::Pat) Failed merges: r? @ghost
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WebAssembly supports saturating floating point to integer casts behind a target feature. The feature is already available on many browsers. Beginning with 1.45 Rust will start defining the behavior of floating point to integer casts to be saturating as well. For this Rust constructs additional checks on top of the
fptoui/fptosiinstructions it emits. Here we introduce the possibility for the codegen backend to construct saturating casts itself and only fall back to constructing the checks ourselves if that is not possible.Resolves part of #73591