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rustc_codegen_llvm cleanups #130506

Merged
merged 14 commits into from
Sep 20, 2024
Merged

rustc_codegen_llvm cleanups #130506

merged 14 commits into from
Sep 20, 2024

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nnethercote
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Some improvements I found while reading through this crate's code.

r? @michaelwoerister

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 18, 2024
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rustbot commented Sep 18, 2024

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

Some changes occurred in coverage instrumentation.

cc @Zalathar

jieyouxu
jieyouxu approved these changes Sep 18, 2024
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AFAICT the changes look good, and they do make the code nicer to read 👍 Some of the changes are a bit more subtle (like the hidden visibility logic), so I would like someone else to also take a look.

compiler/rustc_codegen_llvm/src/builder.rs
Comment on lines +320 to +315
set_math_builder_methods! {
fadd_fast(x, y) => (LLVMBuildFAdd, LLVMRustSetFastMath),
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Remark: I do like how these look 👍

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bors commented Sep 18, 2024

☔ The latest upstream changes (presumably #130519) made this pull request unmergeable. Please resolve the merge conflicts.

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The hidden visibility commit is definitely the trickiest one! I have fixed the conflicts and updated.

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bors commented Sep 19, 2024

☔ The latest upstream changes (presumably #130534) made this pull request unmergeable. Please resolve the merge conflicts.

@nnethercote
Streamline register methods.
785a26a 
These can be made more concise, mostly through appropriate use of `use`
declarations.
@nnethercote
Rename a parameter.
63210bd 
This seems to be a typo. `singletree` doesn't make sense, and everywhere
else it is `singlethread`.
@nnethercote
Streamline report_inline_asm.
9429e64 
By using `use`.
@nnethercote
Reduce repetition in target_is_apple.
0d78f1e
@nnethercote
Use a macro to factor out some repetitive code.
4ce010e 
Similar to the existing macro just above.
@nnethercote
Remove a low-value comment.
eb57550 
We rarely use parameter comments, and these ones don't tell us anything
interesting.
@nnethercote
Streamline hidden visibility setting.
fda530d 
In `get_fn` there is a complicated set of if/elses to determine if
`hidden` visibility should be applied. There are five calls to
`LLVMRustSetVisibility` and some repetition in the comments.

This commit streamlines it a bit:
- Computes `hidden` and then uses it to determine if a single call to
  `LLVMRustSetVisibility` occurs.
- Converts some of the if/elses into boolean expressions.
- Removes the repetitive comments.

Overall this makes it quite a bit shorter, and I find it easier to read.
@nnethercote
Reorder ConstMethods.
bfef261 
It's crazy to have the integer methods in something close to random
order.

The reordering makes the gaps clear: `const_i64`, `const_i128`,
`const_isize`, and `const_u16`. I guess they just aren't needed.
@nnethercote
Reduce visibility.
badd8cc
@nnethercote
Fix a comment.
ccd6c61 
I'm pretty sure `CodegenCx` applies to codegen units, rather than
compilation units.
@nnethercote
Remove a low-value local variable.
3b07169
@nnethercote
Avoid heavy repetition in llvm/ffi.rs.
c5af8b2 
Through judicious use of `use` and `Self`.
@nnethercote
Merge adjacent unsafe extern "C" blocks.
5fd16df
@nnethercote
Reformat some comments.
1f35940 
So they are less than 100 chars.
jieyouxu
jieyouxu approved these changes Sep 19, 2024
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Thanks! I looked at the hidden visibility changes again, and I think the restructure is correct (as in I think it does preserve the original logic). Please r=me after PR CI is green.

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@bors r=jieyouxu

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bors commented Sep 20, 2024

📌 Commit 1f35940 has been approved by jieyouxu

It is now in the queue for this repository.

@bors bors removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 20, 2024
@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Sep 20, 2024
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bors commented Sep 20, 2024

⌛ Testing commit 1f35940 with merge 1a5a224...

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bors commented Sep 20, 2024

☀️ Test successful - checks-actions
Approved by: jieyouxu
Pushing 1a5a224 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Sep 20, 2024
@bors bors merged commit 1a5a224 into rust-lang:master Sep 20, 2024
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@rustbot rustbot added this to the 1.83.0 milestone Sep 20, 2024
This was referenced Sep 20, 2024
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Finished benchmarking commit (1a5a224): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary 3.9%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 3.9% [3.9%, 3.9%] 1
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 3.9% [3.9%, 3.9%] 1

Cycles

Results (primary 3.9%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 3.9% [3.9%, 3.9%] 1
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 3.9% [3.9%, 3.9%] 1

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 769.323s -> 768.108s (-0.16%)
Artifact size: 341.26 MiB -> 341.28 MiB (0.01%)

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@nnethercote @rustbot @bors @rust-timer @jieyouxu @michaelwoerister