Uh oh!
There was an error while loading. Please reload this page.
Rollup of 4 pull requests - #150782
Closed
Kobzol wants to merge 11 commits into
Closed
Conversation
Add a rustc intrinsic `amdgpu_dispatch_ptr` to access the kernel dispatch packet on amdgpu. The HSA kernel dispatch packet contains important information like the launch size and workgroup size. The Rust intrinsic lowers to the `llvm.amdgcn.dispatch.ptr` LLVM intrinsic, which returns a `ptr addrspace(4)`, plus an addrspacecast to `addrspace(0)`, so it can be returned as a Rust reference. The returned pointer/reference is valid for the whole program lifetime, and is therefore `'static`. The return type of the intrinsic (`*const ()`) does not mention the struct so that rustc does not need to know the exact struct type. An alternative would be to define the struct as lang item or add a generic argument to the function. Short version: ```rust #[cfg(target_arch = "amdgpu")] pub fn amdgpu_dispatch_ptr() -> *const (); ```
…ubilee Add amdgpu_dispatch_ptr intrinsic There is an ongoing discussion in rust-lang#150452 about using address spaces from the Rust language in some way. As that discussion will likely not conclude soon, this PR adds one rustc_intrinsic with an addrspacecast to unblock getting basic information like launch and workgroup size and make it possible to implement something like `core::gpu`. Add a rustc intrinsic `amdgpu_dispatch_ptr` to access the kernel dispatch packet on amdgpu. The HSA kernel dispatch packet contains important information like the launch size and workgroup size. The Rust intrinsic lowers to the `llvm.amdgcn.dispatch.ptr` LLVM intrinsic, which returns a `ptr addrspace(4)`, plus an addrspacecast to `addrspace(0)`, so it can be returned as a Rust reference. The returned pointer/reference is valid for the whole program lifetime, and is therefore `'static`. The return type of the intrinsic (`&'static ()`) does not mention the struct so that rustc does not need to know the exact struct type. An alternative would be to define the struct as lang item or add a generic argument to the function. Is this ok or is there a better way (also, should it return a pointer instead of a reference)? Short version: ```rust #[cfg(target_arch = "amdgpu")] pub fn amdgpu_dispatch_ptr() -> *const (); ``` Tracking issue: rust-lang#135024 r? RalfJung as you are already aware of the background (feel free to re-assign)
enrich error info when tries to dlopen Enzyme Implementation for rust-lang#150733. I marked this function as `#[must_use]` even though the other `AtomicPtr` constructors aren't. It's unclear to me why they aren't already marked as such, I opened a zulip thread asking about it: [#t-libs > Is there a reason AtomicPtr constructors aren't #&rust-lang#91;must_use&rust-lang#93;?](https://rust-lang.zulipchat.com/#narrow/channel/219381-t-libs/topic/Is.20there.20a.20reason.20AtomicPtr.20constructors.20aren't.20.23.5Bmust_use.5D.3F/with/566624261).
…umeGomez Deprecated doc intra link related: rust-lang#145899 (comment) print error from EnzymeWrapper::get_or_init(sysroot) as a note r? @ZuseZ4 e.g. 1. when libEnzyme not found ```shell $ rustc +stage1 -Z autodiff=Enable -C lto=fat src/main.rs error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-21` folder in the sysroot candidates: * /Volumes/WD_BLACK_SN850X_HS_1TB/rust-lang/rust/build/aarch64-apple-darwin/stage1/lib | = note: it will be distributed via rustup in the future ``` 2. when could not load libEnzyme successfully ```shell rustc +stage1 -Z autodiff=Enable -C lto=fat src/main.rs error: failed to load our autodiff backend: DlOpen { source: "dlopen(/Volumes/WD_BLACK_SN850X_HS_1TB/rust-lang/rust/build/aarch64-apple-darwin/stage1/lib/rustlib/aarch64-apple-darwin/lib/libEnzyme-21.dylib, 0x0005): tried: \'/Volumes/WD_BLACK_SN850X_HS_1TB/rust-lang/rust/build/aarch64-apple-darwin/stage1/lib/rustlib/aarch64-apple-darwin/lib/libEnzyme-21.dylib\' (slice is not valid mach-o file), \'/System/Volumes/Preboot/Cryptexes/OS/Volumes/WD_BLACK_SN850X_HS_1TB/rust-lang/rust/build/aarch64-apple-darwin/stage1/lib/rustlib/aarch64-apple-darwin/lib/libEnzyme-21.dylib\' (no such file), \'/Volumes/WD_BLACK_SN850X_HS_1TB/rust-lang/rust/build/aarch64-apple-darwin/stage1/lib/rustlib/aarch64-apple-darwin/lib/libEnzyme-21.dylib\' (slice is not valid mach-o file)" } ```
Add AtomicPtr::null fixesrust-lang#98342 r? @GuillaumeGomez Renders intra-doc links in the note text of the `#[deprecated]` attribute. It is quite natural to suggest some other function to use there. So e.g. ```rust #[deprecated(since = "0.0.0", note = "use [`std::mem::size_of`] instead")] ``` renders as <img width="431" height="74" alt="Screenshot from 2026-01-06 12-08-21" src="https://github.com/user-attachments/assets/8f608f08-13ee-4bbf-a631-6008058a51e2" />
Kobzol
commented
Jan 7, 2026
MemberAuthor
@bors r+ rollup=never p=5 |
rust-log-analyzer
commented
Jan 7, 2026
Collaborator
The job Click to see the possible cause of the failure (guessed by this bot) |
Kobzol
commented
Jan 7, 2026
MemberAuthor
@bors r- |
Contributor
Commit 0effbe3 has been unapproved. |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for freeto join this conversation on GitHub.
Already have an account?
Sign in to comment
7 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Successful merges:
r? @ghost
Create a similar rollup