Rollup of 16 pull requests #146462
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Rollup of 16 pull requests #146462
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This fixes ``` error: unused import: `str` --> library/std/src/sys/pal/hermit/os.rs:6:22 | 6 | use crate::{fmt, io, str}; | ^^^ | = note: `-D unused-imports` implied by `-D warnings` = help: to override `-D warnings` add `#[allow(unused_imports)]` ``` This was caused by 845311a. 
Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>
Co-authored-by: Ralf Jung <post@ralfj.de>
These "you are using $RUSTC_VERSION" help messages were removed in rust-lang#142943, but rust-lang#142681 started before that and merged later, so its normalization is vestigial.
match clang's `va_arg` assembly on arm targets tracking issue: rust-lang#44930 For this example ```rust #![feature(c_variadic)] #[unsafe(no_mangle)] unsafe extern "C" fn variadic(a: f64, mut args: ...) -> f64 { let b = args.arg::<f64>(); let c = args.arg::<f64>(); a + b + c } ``` We currently generate (via llvm): ```asm variadic: sub sp, sp, rust-lang#12 stmib sp, {r2, r3} vmov d0, r0, r1 add r0, sp, rust-lang#4 vldr d1, [sp, rust-lang#4] add r0, r0, rust-lang#15 bic r0, r0, rust-lang#7 vadd.f64 d0, d0, d1 add r1, r0, rust-lang#8 str r1, [sp] vldr d1, [r0] vadd.f64 d0, d0, d1 vmov r0, r1, d0 add sp, sp, rust-lang#12 bx lr ``` LLVM is not doing a good job. In fact, it's well-known that LLVM's implementation of `va_arg` is kind of bad, and we implement it ourselves (based on clang) for many targets already. For arm, our own `emit_ptr_va_arg` saves 3 instructions. Next, it turns out it's important for LLVM to explicitly start and end the lifetime of the `va_list`. In rust-lang#146059 I already end the lifetime, but when looking at this again, I noticed that it is important to also start it, see https://godbolt.org/z/EGqvKTTsK: failing to explicitly start the lifetime uses an extra register. So, the combination of `emit_ptr_va_arg` with starting/ending the lifetime makes rustc emit exactly the instructions that clang generates:: ```asm variadic: sub sp, sp, rust-lang#12 stmib sp, {r2, r3} vmov d16, r0, r1 vldr d17, [sp, rust-lang#4] vadd.f64 d16, d16, d17 vldr d17, [sp, rust-lang#12] vadd.f64 d16, d16, d17 vmov r0, r1, d16 add sp, sp, rust-lang#12 bx lr ``` The arguments to `emit_ptr_va_arg` are based on [the clang implementation](https://github.com/llvm/llvm-project/blob/03dc2a41f3d9a500e47b513de5c5008c06860d65/clang/lib/CodeGen/Targets/ARM.cpp#L798-L844). r? `@workingjubilee` (I can re-roll if your queue is too full, but you do seem like the right person here) try-job: armhf-gnu
…,madsmtm,tmandry initial implementation of the darwin_objc unstable feature Tracking issue: rust-lang#145496 This feature makes it possible to reference Objective-C classes and selectors using the same ABI used by native Objective-C on Apple/Darwin platforms. Without it, Rust code interacting with Objective-C must resort to loading classes and selectors using costly string-based lookups at runtime. With it, these references can be loaded efficiently at dynamic load time. r? ``@tmandry`` try-job: `*apple*`
test: remove an outdated normalization for rustc versions These "you are using $RUSTC_VERSION" help messages were removed in rust-lang#142943, but rust-lang#142681 started before that and merged later, so its normalization is vestigial.
rustbot added A-attributes 
| @bors r+ rollup=never p=5 |
bors added S-waiting-on-bors bors added a commit that referenced this pull request Sep 12, 2025
Rollup of 16 pull requests Successful merges: - #144549 (match clang's `va_arg` assembly on arm targets) - #145660 (initial implementation of the darwin_objc unstable feature) - #145895 (thread parking: fix docs and examples) - #146308 (support integer literals in `${concat()}`) - #146323 (check before test for hardware capabilites in bits 32~63 of usize) - #146332 (tidy: make behavior of extra-checks more uniform) - #146374 (Update `browser-ui-test` version to `0.22.2`) - #146413 (Improve suggestion in case a bare URL is surrounded by brackets) - #146426 (Bump miow to 0.60.1) - #146432 (Implement `Socket::take_error` for Hermit) - #146433 (rwlock tests: fix miri macos test regression) - #146435 (Change the default value of `gcc.download-ci-gcc` to `true`) - #146439 (fix cfg for poison test macro) - #146448 ([rustdoc] Correctly handle literal search on paths) - #146449 (Fix `libgccjit` symlink when we build GCC locally) - #146455 (test: remove an outdated normalization for rustc versions) r? `@ghost` `@rustbot` modify labels: rollup
| The job Click to see the possible cause of the failure (guessed by this bot) |
| 💔 Test failed - checks-actions |
bors added S-waiting-on-review 
| Failure is from #145660 |
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Successful merges:
va_argassembly on arm targets #144549 (match clang'sva_argassembly on arm targets)${concat()}#146308 (support integer literals in${concat()})browser-ui-testversion to0.22.2#146374 (Updatebrowser-ui-testversion to0.22.2)Socket::take_errorfor Hermit #146432 (ImplementSocket::take_errorfor Hermit)gcc.download-ci-gcctotrue#146435 (Change the default value ofgcc.download-ci-gcctotrue)libgccjitsymlink when we build GCC locally #146449 (Fixlibgccjitsymlink when we build GCC locally)r? @ghost
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