Implement intrinsics with fallback bodies #120500
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Some changes occurred in compiler/rustc_codegen_gcc Some changes occurred in compiler/rustc_codegen_cranelift cc @bjorn3 Some changes occurred to the CTFE / Miri engine cc @rust-lang/miri Some changes occurred in src/tools/clippy cc @rust-lang/clippy Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt |
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bjorn3
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Jan 30, 2024
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WaffleLapkin
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Thanks for working on this, Oli! I'm really excited 🎉 |
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Some changes occurred in src/librustdoc/clean/types.rs cc @camelid |
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Should finally be ready. We don't need miri support from the get go, so I'd rather do it in a separate PR. |
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| fx.tcx | ||
| .dcx() | ||
| .span_fatal(source_info.span, format!("unsupported intrinsic {}", intrinsic)); | ||
| } |
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What will the error message be for intrinsics that are neither implemented by cg_clif nor have a fallback body?
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probably gonna ICE 😆
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cg_clif changes LGTM |
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The Miri subtree was changed cc @rust-lang/miri |
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@bors r=WaffleLapkin |
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The default log presentation was not expanding for me; below is what I think was causing the failure according to what I saw from skimming the raw log itself. Snippet of raw log output with ui test failures |
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That's an error from a different PR: #120847 (see last commit) |
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Implement intrinsics with fallback bodies fixes rust-lang#93145 (though we can port many more intrinsics) cc rust-lang#63585 The way this works is that the backend logic for generating custom code for intrinsics has been made fallible. The only failure path is "this intrinsic is unknown". The `Instance` (that was `InstanceDef::Intrinsic`) then gets converted to `InstanceDef::Item`, which represents the fallback body. A regular function call to that body is then codegenned. This is currently implemented for * codegen_ssa (so llvm and gcc) * codegen_cranelift other backends will need to adjust, but they can just keep doing what they were doing if they prefer (though adding new intrinsics to the compiler will then require them to implement them, instead of getting the fallback body). cc `@scottmcm` `@WaffleLapkin` ### todo * [ ] miri support * [x] default intrinsic name to name of function instead of requiring it to be specified in attribute * [x] make sure that the bodies are always available (must be collected for metadata)
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☀️ Test successful - checks-actions |
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Finished benchmarking commit (dfa88b3): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesThis benchmark run did not return any relevant results for this metric. Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: 637.782s -> 637.11s (-0.11%) |
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Add a scheme for moving away from `extern "rust-intrinsic"` entirely All `rust-intrinsic`s can become free functions now, either with a fallback body, or with a dummy body and an attribute, requiring backends to actually implement the intrinsic. This PR demonstrates the dummy-body scheme with the `vtable_size` intrinsic. cc rust-lang#63585 follow-up to rust-lang#120500 MCP at rust-lang/compiler-team#720
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Add a scheme for moving away from `extern "rust-intrinsic"` entirely All `rust-intrinsic`s can become free functions now, either with a fallback body, or with a dummy body and an attribute, requiring backends to actually implement the intrinsic. This PR demonstrates the dummy-body scheme with the `vtable_size` intrinsic. cc rust-lang#63585 follow-up to rust-lang#120500 MCP at rust-lang/compiler-team#720
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Add a scheme for moving away from `extern "rust-intrinsic"` entirely All `rust-intrinsic`s can become free functions now, either with a fallback body, or with a dummy body and an attribute, requiring backends to actually implement the intrinsic. This PR demonstrates the dummy-body scheme with the `vtable_size` intrinsic. cc rust-lang#63585 follow-up to rust-lang#120500 MCP at rust-lang/compiler-team#720
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Upgrade toolchain to 2024-02-17. Relevant PR: - rust-lang/rust#120500 - rust-lang/rust#100603 Fixes #87 Fixes #3034 Fixes #3037
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Implement intrinsics with fallback bodies fixes rust-lang#93145 (though we can port many more intrinsics) cc rust-lang#63585 The way this works is that the backend logic for generating custom code for intrinsics has been made fallible. The only failure path is "this intrinsic is unknown". The `Instance` (that was `InstanceDef::Intrinsic`) then gets converted to `InstanceDef::Item`, which represents the fallback body. A regular function call to that body is then codegenned. This is currently implemented for * codegen_ssa (so llvm and gcc) * codegen_cranelift other backends will need to adjust, but they can just keep doing what they were doing if they prefer (though adding new intrinsics to the compiler will then require them to implement them, instead of getting the fallback body). cc `@scottmcm` `@WaffleLapkin` ### todo * [ ] miri support * [x] default intrinsic name to name of function instead of requiring it to be specified in attribute * [x] make sure that the bodies are always available (must be collected for metadata)
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Add a scheme for moving away from `extern "rust-intrinsic"` entirely All `rust-intrinsic`s can become free functions now, either with a fallback body, or with a dummy body and an attribute, requiring backends to actually implement the intrinsic. This PR demonstrates the dummy-body scheme with the `vtable_size` intrinsic. cc rust-lang#63585 follow-up to rust-lang#120500 MCP at rust-lang/compiler-team#720
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Add a scheme for moving away from `extern "rust-intrinsic"` entirely All `rust-intrinsic`s can become free functions now, either with a fallback body, or with a dummy body and an attribute, requiring backends to actually implement the intrinsic. This PR demonstrates the dummy-body scheme with the `vtable_size` intrinsic. cc rust-lang#63585 follow-up to rust-lang#120500 MCP at rust-lang/compiler-team#720
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Add a scheme for moving away from `extern "rust-intrinsic"` entirely All `rust-intrinsic`s can become free functions now, either with a fallback body, or with a dummy body and an attribute, requiring backends to actually implement the intrinsic. This PR demonstrates the dummy-body scheme with the `vtable_size` intrinsic. cc rust-lang#63585 follow-up to rust-lang#120500 MCP at rust-lang/compiler-team#720
Sorry, I just now realized that |
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Note that is_val_statically_known and const_eval_select are entirely unrelated. (The first is about const propagation, the second about Const eval / CTFE. These two concepts have very little to do with each other.)
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fixes #93145 (though we can port many more intrinsics)
cc #63585
The way this works is that the backend logic for generating custom code for intrinsics has been made fallible. The only failure path is "this intrinsic is unknown". The
Instance(that wasInstanceDef::Intrinsic) then gets converted toInstanceDef::Item, which represents the fallback body. A regular function call to that body is then codegenned. This is currently implemented forother backends will need to adjust, but they can just keep doing what they were doing if they prefer (though adding new intrinsics to the compiler will then require them to implement them, instead of getting the fallback body).
cc @scottmcm @WaffleLapkin
todo