Add support for SVE types and registers in inline assembly#1
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GeorgeWort wants to merge 3 commits intoJamieCunliffe:svefrom
Open
Add support for SVE types and registers in inline assembly#1GeorgeWort wants to merge 3 commits intoJamieCunliffe:svefrom
GeorgeWort wants to merge 3 commits intoJamieCunliffe:svefrom
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The representation of the element type has been changed to be a slice rather than a zero length array. Two feature gates are now required in core_arch unsized fn params and unsized locals. This still leaves unsized return types being an issue. For this we are currently bypassing some of the `Sized` trait checking to pass when the type is scalable simd. This still leaves the copy issue. For that we have marked scalable simd types as trivally pure clone copy. We have still had to remove some trait checks for the copy trait with this though as they are still performed in certain situations. The implementation of `transmute` is also an issue for us. For this a new SIMD intrinsic has been created simd_reinterpret which performs a transmute on SIMD vectors. A few intrinsics need to be able to produce an LLVM `undef` this intrinsic will also produce that when given a zero sized input.
This patch passes three new register constraints (y, Upa, Upl) to LLVM, along with allowing the SVE types to be passed in and out of inline assembly.
JamieCunliffe
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Jul 9, 2025
JamieCunliffe
pushed a commit
that referenced
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Jan 8, 2026
This resulted in the following error for me:
error[E0464]: multiple candidates for `rlib` dependency `rustc_literal_escaper` found
--> clippy_dev/src/lib.rs:25:1
|
25 | extern crate rustc_literal_escaper;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: candidate #1: /home/pkrones/.rustup/toolchains/nightly-2025-12-25-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_literal_escaper-4f30574e01c3dad1.rlib
= note: candidate rust-lang#2: /home/pkrones/.rustup/toolchains/nightly-2025-12-25-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_literal_escaper-c8a0e29ad1040cee.rmeta
Other tools in the Rust repo also take that as an explicit dependency, like rust-analyzer or lint-docs.
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This patch passes three new register constraints (y, Upa, Upl) to LLVM, along with allowing the SVE types to be passed in and out of inline assembly.