Remove `TypeckResults` from `InferCtxt` by camsteffen · Pull Request #101632 · rust-lang/rust

camsteffen · 2022-09-09T20:30:42Z

InferCtxt currently has in_progress_typeck_results which is only used for some diagnostics during typeck. It adds a lifetime which propagates through a lot of code. This PR moves that field into a new helper struct TypeErrCtxt.

rust-highfive · 2022-09-09T20:30:45Z

r? @oli-obk

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rustbot · 2022-09-09T20:30:45Z

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

Some changes occurred in const_evaluatable.rs

cc @lcnr

Some changes occurred in need_type_info.rs

cc @lcnr

bors · 2022-09-11T00:02:16Z

☔ The latest upstream changes (presumably #98559) made this pull request unmergeable. Please resolve the merge conflicts.

compiler/rustc_infer/src/infer/error_reporting/mod.rs

compiler/rustc_typeck/src/check/inherited.rs

lcnr

really happy about this PR as it is something i've wanted to do myself for quite a while ❤️

some nits and further suggestions, but this looks pretty good already

compiler/rustc_infer/src/infer/mod.rs

compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs

compiler/rustc_infer/src/infer/combine.rs

lcnr · 2022-09-12T09:29:36Z

r? @lcnr

camsteffen · 2022-09-20T13:59:53Z

I don't know where to start with the failing rustdoc tests 😤

bors · 2022-09-20T22:04:45Z

☔ The latest upstream changes (presumably #102061) made this pull request unmergeable. Please resolve the merge conflicts.

lcnr · 2022-09-21T08:29:35Z

🤔 i also can't tell why rustdoc is failing 😅 maybe look at the actually generated docs for the smallest failing test to check whether there are any user-visible changes? 🤔

camsteffen · 2022-09-29T00:28:12Z

~~Looks like a bit of waiting and doing nothing made the problem go away!~~ nope

camsteffen · 2022-09-29T00:28:40Z

@rustbot ready

src/librustdoc/clean/blanket_impl.rs

compiler/rustc_hir_analysis/src/check/fn_ctxt/mod.rs

lcnr · 2022-10-03T09:45:05Z

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

should these be on TypeErrCtxt instead?

Maybe? I was being conservative, only moving stuff to TypeErrCtxt if it needs TypeckResults.

compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs

src/tools/clippy/clippy_lints/src/future_not_send.rs

lcnr · 2022-10-03T10:03:29Z

small nits which we can fix in a followup pr

prone to merge conflicts:
@bors r+ p=5 rollup=never

bors · 2022-10-03T10:03:30Z

📌 Commit d68bfb9012f16c29c52dea118439dc1c8d4354a5 has been approved by lcnr

It is now in the queue for this repository.

bors · 2022-10-07T13:54:59Z

⌛ Testing commit 283abbf with merge 43c22af...

bors · 2022-10-07T17:37:33Z

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing 43c22af to master...

rust-timer · 2022-10-07T18:58:45Z

Finished benchmarking commit (43c22af): comparison URL.

Overall result: ❌✅ regressions and improvements - ACTION NEEDED

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean¹	range	count²
Regressions ❌ (primary)	0.7%	[0.5%, 1.2%]	13
Regressions ❌ (secondary)	4.3%	[3.2%, 5.7%]	6
Improvements ✅ (primary)	-0.3%	[-0.6%, -0.2%]	19
Improvements ✅ (secondary)	-0.6%	[-1.6%, -0.2%]	52
All ❌✅ (primary)	0.1%	[-0.6%, 1.2%]	32

Max RSS (memory usage)

Results

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.

	mean¹	range	count²
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.5%	[2.1%, 4.5%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.6%	[-2.9%, -2.3%]	2
All ❌✅ (primary)	-	-	0

Cycles

Results

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.

	mean¹	range	count²
Regressions ❌ (primary)	2.4%	[2.4%, 2.4%]	1
Regressions ❌ (secondary)	3.4%	[3.4%, 3.4%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.4%	[-3.4%, -3.4%]	1
All ❌✅ (primary)	2.4%	[2.4%, 2.4%]	1

the arithmetic mean of the percent change ↩ ↩² ↩³
number of relevant changes ↩ ↩² ↩³

lcnr · 2022-10-10T04:25:58Z

oh wow, should have definitely run perf before approving this 😅

i guess this resulted in a lot of small inlining/optimization changes, might be worth to check out the flamegraph comparison of a few regressions to check if we can maybe fix them by putting #[inline] somewhere.

rylev · 2022-10-11T15:44:26Z

@lcnr @camsteffen I ran callgrind diff on one of the benchmarks. Looks specialization_graph::Children::insert is getting called way more.

--------------------------------------------------------------------------------
Ir           file:function
--------------------------------------------------------------------------------
 94,311,966  ???:rustc_trait_selection::traits::coherence::overlapping_impls::<<rustc_middle::traits::specialization_graph::Children as rustc_trait_selection::traits::specialize::specialization_graph::ChildrenExt>::insert::{closure
-66,019,056  ???:<rustc_middle::traits::specialization_graph::Children as rustc_trait_selection::traits::specialize::specialization_graph::ChildrenExt>::insert
  7,957,920  ???:__rust_probestack
 -7,904,085  ???:<rustc_infer::infer::InferCtxtBuilder>::enter::<core::result::Result<alloc::vec::Vec<rustc_middle::ty::Predicate>, rustc_errors::ErrorGuaranteed>, rustc_trait_selection::traits::do_normalize_predicates::{closure
  6,887,397  ???:rustc_trait_selection::traits::do_normalize_predicates
  4,716,702  ???:<rustc_infer::infer::InferCtxt>::probe::<(), <rustc_trait_selection::traits::select::SelectionContext>::assemble_candidates_from_impls::{closure
 -4,586,815  ???:<rustc_trait_selection::traits::select::SelectionContext>::match_impl
  4,052,492  ???:<rustc_infer::infer::InferCtxtBuilder>::build
 -3,625,123  /build/glibc-eX1tMB/glibc-2.31/string/../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:__memcpy_avx_unaligned_erms

camsteffen · 2022-10-11T19:30:47Z

Thanks @rylev. I think it might be traits::overlapping_impls that needs inline? I see that function in the callgrind diff, and the changes to that function might have made it not inlined anymore.

rylev · 2022-10-11T19:46:30Z

@camsteffen the symbol is a bit hard to parse. It seems like it's not the function but possibly a closure inside of that function? Might require some experimentation.

camsteffen · 2022-10-11T20:35:03Z

Probably this closure, and if overlapping_impls is inlined, then the closure would probably be inlined as well?

camsteffen · 2022-10-13T20:20:28Z

bitmaps perf addressed in #102931. Looks like deeply-nested-multi could use another fix.

nnethercote · 2022-10-13T20:32:17Z

deeply-nested-multi is less important, plus it has been noisy lately, so don't spend too much time on it.

camsteffen · 2022-10-13T20:34:46Z

Thanks @nnethercote. I'll gladly ignore that.

… r=cjgillot Make `overlapping_impls` not generic Trying to win back perf from rust-lang#101632.

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rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Sep 9, 2022

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lcnr reviewed Sep 12, 2022

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lcnr added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 12, 2022

camsteffen force-pushed the refactor-infer-err branch 2 times, most recently from 4c43c71 to ce7f171 Compare September 20, 2022 13:42

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camsteffen force-pushed the refactor-infer-err branch from ce7f171 to 6da620c Compare September 29, 2022 00:24

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camsteffen force-pushed the refactor-infer-err branch from 6da620c to d68bfb9 Compare October 1, 2022 16:39

camsteffen commented Oct 1, 2022

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bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Oct 7, 2022

bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 7, 2022

bors merged commit 43c22af into rust-lang:master Oct 7, 2022

rustbot added this to the 1.66.0 milestone Oct 7, 2022

camsteffen deleted the refactor-infer-err branch October 7, 2022 17:38

rustbot added the perf-regression Performance regression. label Oct 7, 2022

camsteffen mentioned this pull request Oct 11, 2022

Make overlapping_impls not generic #102931

Merged

bors added a commit to rust-lang-ci/rust that referenced this pull request Oct 16, 2022

Auto merge of rust-lang#102931 - camsteffen:inline-overlapping-impls,…

75dbd5b

… r=cjgillot Make `overlapping_impls` not generic Trying to win back perf from rust-lang#101632.

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rust-timer commented Oct 7, 2022

Overall result: ❌✅ regressions and improvements - ACTION NEEDED

Instruction count

Max RSS (memory usage)

Cycles

Footnotes

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