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comments for deduce_param_attrs#147873

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Oct 19, 2025
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comments for deduce_param_attrs#147873
bors merged 1 commit intorust-lang:masterfrom
RalfJung:deduce_param_attrs

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@RalfJung RalfJung commented Oct 19, 2025 •
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Cc @saethlin since IIRC you experimented with codegen doing post-mono MIR ops? That seems to be in conflict with this pass.
Cc @tmiasko

r? @scottmcm

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rustbot commented Oct 19, 2025

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

@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 Oct 19, 2025
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rustbot commented Oct 19, 2025

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

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RalfJung commented Oct 19, 2025

Lol, #147695 recently changed this quite a bit and I thought my 24h old branch was new enough...^^ That PR subsumes the one logic change I had here; now this just adds some comments (most of which are minor, but the one about MIR opts during codegen seems crucial).

Cc @cjgillot

@RalfJung RalfJung changed the title comments and tweaks for deduce_param_attrs comments for deduce_param_attrs Oct 19, 2025
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tmiasko commented Oct 19, 2025

Could you also update the pull request description (it references code changes which are no longer there)?

Thanks. r=me

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RalfJung commented Oct 19, 2025
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compiler/rustc_mir_transform/src/deduce_param_attrs.rs
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@RalfJung RalfJung Oct 19, 2025 •
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Codegen actually uses instance_mir so using optimized_mir here seems a bit inconsistent?
Things could go quite wrong if they end up using different MIR...

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rustbot commented Oct 19, 2025

Some changes occurred in compiler/rustc_codegen_ssa

cc @WaffleLapkin

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RalfJung commented Oct 19, 2025

Could you also update the pull request description (it references code changes which are no longer there)?

Done. I've also added comments in codegen itself.

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RalfJung commented Oct 19, 2025

@bors r=tmiasko rollup

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bors commented Oct 19, 2025

📌 Commit 82f6c60 has been approved by tmiasko

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 19, 2025
@matthiaskrgr matthiaskrgr mentioned this pull request Oct 19, 2025
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saethlin commented Oct 19, 2025

you experimented with codegen doing post-mono MIR ops? That seems to be in conflict with this pass.

It sure is, this pass is the primary reason post-mono opts are stuck.

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tmiasko commented Oct 19, 2025

If we decide on post mono MIR passes I think it would be fine to remove attribute deduction.

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RalfJung commented Oct 19, 2025 via email

bors added a commit that referenced this pull request Oct 19, 2025
@bors
Auto merge of #147884 - matthiaskrgr:rollup-pjqcccz, r=matthiaskrgr
b4f28c6 
Rollup of 4 pull requests

Successful merges:

 - #147575 (Refactor move analysis subpath representation)
 - #147864 (Parse `const unsafe trait` properly)
 - #147868 (MirPatch: Simplify new_local.)
 - #147873 (comments for deduce_param_attrs)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit that referenced this pull request Oct 19, 2025
@bors
Auto merge of #147884 - matthiaskrgr:rollup-pjqcccz, r=matthiaskrgr
4ddbb60 
Rollup of 4 pull requests

Successful merges:

 - #147575 (Refactor move analysis subpath representation)
 - #147864 (Parse `const unsafe trait` properly)
 - #147868 (MirPatch: Simplify new_local.)
 - #147873 (comments for deduce_param_attrs)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 362c9e2 into rust-lang:master Oct 19, 2025
11 checks passed
rust-timer added a commit that referenced this pull request Oct 19, 2025
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Unrolled build for #147873
1be004b 
Rollup merge of #147873 - RalfJung:deduce_param_attrs, r=tmiasko

comments for deduce_param_attrs

Cc `@saethlin` since IIRC you experimented with codegen doing post-mono MIR ops? That seems to be in conflict with this pass.
Cc `@tmiasko`

r? `@scottmcm`
@rustbot rustbot added this to the 1.92.0 milestone Oct 19, 2025
github-actions bot pushed a commit to rust-lang/rustc-dev-guide that referenced this pull request Oct 20, 2025
@bors
Auto merge of #147884 - matthiaskrgr:rollup-pjqcccz, r=matthiaskrgr
9e3b484 
Rollup of 4 pull requests

Successful merges:

 - rust-lang/rust#147575 (Refactor move analysis subpath representation)
 - rust-lang/rust#147864 (Parse `const unsafe trait` properly)
 - rust-lang/rust#147868 (MirPatch: Simplify new_local.)
 - rust-lang/rust#147873 (comments for deduce_param_attrs)

r? `@ghost`
`@rustbot` modify labels: rollup
@RalfJung RalfJung deleted the deduce_param_attrs branch October 20, 2025 12:10
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