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Offload device1 #142696

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@ZuseZ4 ZuseZ4 commented Jun 18, 2025

r? @oli-obk

Here I'll continue the device side code generation, and park the second commit for now.
I first want to land the mvp in the other PR.

@rustbot rustbot added A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. F-autodiff `#![feature(autodiff)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jun 18, 2025
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bors commented Jun 26, 2025

☔ The latest upstream changes (presumably #143026) made this pull request unmergeable. Please resolve the merge conflicts.

@bors bors added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Jun 26, 2025
@ZuseZ4 ZuseZ4 force-pushed the offload-device1 branch from 100f9f3 to 7cf6e76 Compare July 2, 2025 23:56
@ZuseZ4 ZuseZ4 force-pushed the offload-device1 branch from 7cf6e76 to 65bd406 Compare July 10, 2025 00:45
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ZuseZ4 commented Jul 10, 2025
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@ZuseZ4 ZuseZ4 force-pushed the offload-device1 branch from 65bd406 to e30f77b Compare July 10, 2025 22:10
@ZuseZ4 ZuseZ4 force-pushed the offload-device1 branch from e30f77b to 4273fb1 Compare July 22, 2025 19:47
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ZuseZ4 commented Jul 22, 2025

We'll still need #143684 to properly recognize our GPU hardware and run the binary on end-user hardware, but here I'll only add codegen tests, so it should work fine for CI.

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Flakebi and others added 2 commits July 23, 2025 14:54
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Fix linker-plugin-lto only doing thin lto
692facf 
When rust provides LLVM bitcode files to lld and the bitcode contains
function summaries as used for thin lto, lld defaults to using thin lto.
This prevents some optimizations that are only applied for fat lto.

We solve this by not creating function summaries when fat lto is
enabled. The bitcode for the module is just directly written out.

An alternative solution would be to set the `ThinLTO=0` module flag to
signal lld to do fat lto.
The code in clang that sets this flag is here:
https://github.com/llvm/llvm-project/blob/560149b5e3c891c64899e9912e29467a69dc3a4c/clang/lib/CodeGen/BackendUtil.cpp#L1150
The code in LLVM that queries the flag and defaults to thin lto if not
set is here:
https://github.com/llvm/llvm-project/blob/e258bca9505f35e0a22cb213a305eea9b76d11ea/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp#L4441-L4446
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disable cfg.has_reliable_f128 on amdgcn
28b9090
@rustbot rustbot added the A-run-make Area: port run-make Makefiles to rmake.rs label Jul 24, 2025
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The job tidy failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot) 
tidy check
Checking tidy rustdoc_json...
No error code explanation was removed!
tidy: Skipping binary file check, read-only filesystem
##[error]tidy error: /checkout/compiler/rustc_codegen_llvm/src/builder/gpu_device.rs:88: TODO is used for tasks that should be done before merging a PR; If you want to leave a message in the codebase use FIXME
removing old virtual environment
creating virtual environment at '/checkout/obj/build/venv' using 'python3.10' and 'venv'
creating virtual environment at '/checkout/obj/build/venv' using 'python3.10' and 'virtualenv'
Requirement already satisfied: pip in ./build/venv/lib/python3.10/site-packages (25.1.1)
linting python files
---

added 291 packages in 36s
Running eslint on rustdoc JS files
info: ES-Check: there were no ES version matching errors!  🎉
some tidy checks failed
Command has failed. Rerun with -v to see more details.
Build completed unsuccessfully in 0:01:53
  local time: Thu Jul 24 00:23:56 UTC 2025
  network time: Thu, 24 Jul 2025 00:23:56 GMT
##[error]Process completed with exit code 1.
Post job cleanup.

@ZuseZ4 ZuseZ4 mentioned this pull request Jul 24, 2025
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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-run-make Area: port run-make Makefiles to rmake.rs F-autodiff `#![feature(autodiff)]` S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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