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With `lto = "fat"` or `lto = "thin"`, the build of a binary that uses a library with kernels stopped with an error: "failed to get bitcode from object file for LTO (Can't find section .llvmbc)". rustc keeps a list of the Rust objects in each rlib. This list contains the objects of all modules. With LTO, rustc reads bitcode from these objects and removes them from the link. The artifact objects have no bitcode. If a session writes an rlib, the backend now gives each artifact object to rustc as the DWARF object of its module. This object is in the rlib, but it is not in the list. LTO does not read this object, and the linker gets it from the rlib. The system linker does not get the DWARF objects. If the session also writes a binary or a dynamic library, the backend gives the artifact objects to this linker as link arguments. With `-Zlink-native-libraries=no`, rustc does not give link arguments to the linker. Then the artifact objects of this session are Rust objects, as before. The book said that `join_codegen()` and `link()` only call the LLVM backend. Now it tells what they add to the outputs. CI builds `cuda_module_in_lib` with fat LTO. The library is an rlib, and then an rlib and a cdylib. After each build, CI makes sure that the binary has the PTX bundles of the library and of the binary. It also makes sure that the cdylib has the PTX bundle of the library. Fixes NVIDIA#1495 Signed-off-by: Mikhail Borisov <[email protected]> Co-Authored-By: Claude Opus 5.5 <[email protected]>
Use Cargo target names for standalone emit-ltoir artifacts. Bind the compiler and reader to the same intermediate directory when invoked from a Cargo workspace member. Signed-off-by: Trent Nelson <[email protected]>
Accept ordered external LTO files when materializing embedded cubins. Include their content in the codegen fingerprint and verify owned bytes before linking through the existing finalizer. Preserve inputs that overlap generated output paths and diagnose unresolved device symbols. Add a standalone CUDA FFI example and a native regression script. Signed-off-by: Trent Nelson <[email protected]>
Reuse existing example dependency pins and classify external LTO as an FFI fixture. Run its linking regression in native sweeps and verify relocatable debug output in the existing full-debug route. Signed-off-by: Trent Nelson <[email protected]>
Preserve exact geometry and fixed dynamic shared-memory requirements through artifact loading so preparation can select and validate the compiled allocation. Keep artifact writers and readers on one in-tree implementation while preserving legacy bundles without launch facts. Signed-off-by: Trent Nelson <[email protected]>
Combine the reviewed compiler prerequisites for native library calls. Keep the external LTO fixture on the shared in-tree artifact implementation. Signed-off-by: Trent Nelson <[email protected]>
Use the reviewed Cargo target and output-directory correction in the combined compiler prerequisite tree. Signed-off-by: Trent Nelson <[email protected]>
Resolve concrete registration functions and scalar argument types during device compilation, then invoke the native provider and link its owned LTO output through the ordinary artifact finalizer. Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Carry the convergence marker through private dependency metadata and emit it on each marked LLVM declaration before native optimization. Deduplicate repeated extern symbols while rejecting incompatible signatures and convergence requirements. Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]> # Conflicts: # cuda-oxide/crates/rustc-codegen-cuda/src/library.rs
Keep original MIR and static identities while emitting checked helper bodies for each root. Route typed calls and native plans through those bodies so shared helpers can use distinct block shapes. Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Treat each block as one cluster when a known earlier target is selected. Bind a device hint only after this fallback is used, so later feature selection cannot silently change its semantics. Keep raw intrinsic and cluster operation target requirements intact. Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
…op-interop-storage-publication Signed-off-by: Trent Nelson <[email protected]>
…op-interop-callback-publication Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
…op-interop-storage-publication Signed-off-by: Trent Nelson <[email protected]>
…op-interop-callback-publication Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Recognize canonical group queries and checked scratch-free warp calls. Track participation and memory access by group scope while preserving block synchronization and existing native-call contracts. Signed-off-by: Trent Nelson <[email protected]>
Carry inline helper scopes through MIR lowering whenever line tables are enabled, so device instructions keep their source file and callsite. Keep local variable metadata limited to full debug information. Signed-off-by: Trent Nelson <[email protected]>
Carry logical widths through checked call lowering and preserve the completion scope of canonical WarpTile synchronization. Signed-off-by: Trent Nelson <[email protected]>
Preserve the first matching call edge and library record while avoiding repeated linear scans during collective validation. Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Keep active control and memory completion checks while allowing wider operations after finite sibling work. Remove the persistent cycle restriction and its helper propagation. Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
Signed-off-by: Trent Nelson <[email protected]>
This was referenced Oct 21, 2026
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Native Warp collectives can now use an independent scratch region for each physical or logical warp. The planner replicates each scope's aligned layout across the block, and the checker recognizes matching Warp completion and barriers covering contained groups. This enables CUB Warp Transpose without sibling groups sharing scratch accidentally.
Planned roots also reject unconstrained native dynamic shared-memory views, including zero-scratch calls with a numeric shared-memory contract. Fixed native views remain supported.
This draft follows #1584 and includes #1585. Review this slice.
Validation: 41 backend tests, strict Clippy and all 156 public compiler controls pass. Focused GPU checks cover replicated storage, byte/64-bit accesses and the larger-block case. The matching Git-installed toolchain also runs the separate-helper example successfully. The combined GPU suite passes, including 18 sanitizer runs and 20 expected-error checks. Direct/Transpose CUB comparisons are complete; overhead varies by workload. Final foundation review remains open.