Introduce mir::Unevaluated #102056

b-naber · 2022-09-20T15:41:57Z

Previously the distinction between unevaluated constants in the type-system and in mir was not explicit and a little confusing. Probably better to introduce its own type for that.

r? @lcnr

rustbot · 2022-09-20T15:42:01Z

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

Some changes occurred to the CTFE / Miri engine

cc @rust-lang/miri

Some changes occurred in const_evaluatable.rs

cc @lcnr

lcnr

nice, small nits, then r=me

compiler/rustc_middle/src/mir/mod.rs

compiler/rustc_middle/src/ty/consts/kind.rs

lcnr · 2022-09-20T15:57:10Z

compiler/rustc_middle/src/mir/mod.rs

+impl<'tcx> Unevaluated<'tcx> {
+    // FIXME: probably should get rid of this method. It's also wrong to
+    // shrink and then later expand a promoted.
+    #[inline]


yeah, once we've removed visit_mir_constant we should be able to remove this, probably makes sense to do that in yet another pr 😁

bors · 2022-09-20T22:51:18Z

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

compiler/rustc_middle/src/mir/mod.rs

lcnr

final nit, then r=me

compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs

lcnr · 2022-09-22T12:14:32Z

@bors delegate+

bors · 2022-09-22T12:14:34Z

✌️ @b-naber can now approve this pull request

lcnr · 2022-09-23T13:12:12Z

compiler/rustc_mir_transform/src/inline.rs

@@ -605,7 +605,7 @@ impl<'tcx> Inliner<'tcx> {
                caller_body.required_consts.extend(
                    callee_body.required_consts.iter().copied().filter(|&ct| match ct.literal {
                        ConstantKind::Ty(_) => {
-                            bug!("should never encounter ty::Unevaluated in `required_consts`")
+                            bug!("should never encounter ty::UnevaluatedConst in `required_consts`")


this should be "unexpected ty::Const"

lcnr · 2022-09-23T13:15:00Z

@bors r+ rollup=never

maybe perf relevant, probably not 🤷 the queue is pretty short rn

bors · 2022-09-23T13:15:02Z

📌 Commit a705e65 has been approved by lcnr

It is now in the queue for this repository.

bors · 2022-09-23T13:39:19Z

⌛ Testing commit a705e65 with merge 9a963e3...

bors · 2022-09-23T16:43:59Z

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing 9a963e3 to master...

rust-timer · 2022-09-23T18:01:18Z

Finished benchmarking commit (9a963e3): 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

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)	2.4%	[2.0%, 2.9%]	2
Improvements ✅ (primary)	-3.5%	[-3.5%, -3.5%]	1
Improvements ✅ (secondary)	-1.7%	[-1.7%, -1.7%]	1
All ❌✅ (primary)	-3.5%	[-3.5%, -3.5%]	1

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)	-	-	0
Regressions ❌ (secondary)	4.0%	[4.0%, 4.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.2%	[-4.5%, -2.6%]	4
All ❌✅ (primary)	-	-	0

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

Introduce mir::Unevaluated Previously the distinction between unevaluated constants in the type-system and in mir was not explicit and a little confusing. Probably better to introduce its own type for that. r? `@lcnr`

rust-highfive assigned lcnr Sep 20, 2022

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 20, 2022

lcnr reviewed Sep 20, 2022

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compiler/rustc_middle/src/ty/consts/kind.rs Outdated Show resolved Hide resolved

lcnr reviewed Sep 20, 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 21, 2022

b-naber force-pushed the unevaluated branch from 6f42f1a to 85aa94f Compare September 21, 2022 17:02

RalfJung reviewed Sep 21, 2022

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compiler/rustc_middle/src/mir/mod.rs Outdated Show resolved Hide resolved

b-naber added 3 commits September 22, 2022 12:35

introduce mir::Unevaluated

9f3784d

bless tests

db7df59

address review

efb9089

b-naber force-pushed the unevaluated branch 2 times, most recently from 23d044f to fad44e0 Compare September 22, 2022 10:39

lcnr reviewed Sep 22, 2022

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compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs Show resolved Hide resolved

b-naber force-pushed the unevaluated branch from fad44e0 to 43ddb7f Compare September 23, 2022 12:12

rename Unevaluated to UnevaluatedConst

a705e65

b-naber force-pushed the unevaluated branch from 43ddb7f to a705e65 Compare September 23, 2022 12:27

lcnr reviewed Sep 23, 2022

View reviewed changes

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Sep 23, 2022

bors added the merged-by-bors This PR was explicitly merged by bors. label Sep 23, 2022

bors merged commit 9a963e3 into rust-lang:master Sep 23, 2022

rustbot added this to the 1.66.0 milestone Sep 23, 2022

This was referenced Sep 23, 2022

make const_err a hard error #102091

Merged

reimplement ~const Trait bounds via a fourth kind of generic param #101900

Closed

Add ConstKind::Expr #99798

Merged

lcnr added the A-const-generics Area: const generics (parameters and arguments) label Sep 23, 2022

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Introduce mir::Unevaluated #102056

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Introduce mir::Unevaluated #102056

Introduce mir::Unevaluated #102056

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Overall result: no relevant changes - no action needed

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