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Try enabling precondition checks on ptr::{read,write} #129498

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@saethlin saethlin commented Aug 24, 2024

The overhead here is probably too much, but let's have the measurement anyway.

This will fail at least one codegen test.

r? @ghost

  • Ralf says: If we keep this attribute, the docs on the intrinsic should be updated.

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Aug 24, 2024
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@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 24, 2024
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bors commented Aug 24, 2024

⌛ Trying commit 0a65e30 with merge aadda4d...

bors added a commit to rust-lang-ci/rust that referenced this pull request Aug 24, 2024
…, r=<try>

Try enabling precondition checks on ptr::{read,write}

The overhead here is probably too much, but let's have the measurement anyway.

This will fail at least one codegen test.

r? `@ghost`
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bors commented Aug 24, 2024

☀️ Try build successful - checks-actions
Build commit: aadda4d (aadda4d695969f6a5337d0bf19f1e6572bd67922)

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Finished benchmarking commit (aadda4d): comparison URL.

Overall result: ❌✅ regressions and improvements - ACTION NEEDED

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

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

mean range count
Regressions ❌
(primary)
0.7% [0.2%, 1.9%] 52
Regressions ❌
(secondary)
2.0% [0.2%, 6.3%] 32
Improvements ✅
(primary)
-0.6% [-0.9%, -0.4%] 3
Improvements ✅
(secondary)
-1.3% [-1.3%, -1.3%] 1
All ❌✅ (primary) 0.6% [-0.9%, 1.9%] 55

Max RSS (memory usage)

Results (primary 0.3%)

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)
3.1% [0.6%, 5.0%] 4
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-3.3% [-3.7%, -2.8%] 3
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 0.3% [-3.7%, 5.0%] 7

Cycles

Results (primary 1.5%, secondary 3.3%)

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)
1.5% [0.7%, 2.1%] 6
Regressions ❌
(secondary)
3.3% [2.1%, 5.3%] 8
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 1.5% [0.7%, 2.1%] 6

Binary size

Results (primary 0.6%, secondary 0.6%)

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)
0.7% [0.0%, 6.1%] 77
Regressions ❌
(secondary)
3.2% [1.1%, 3.7%] 12
Improvements ✅
(primary)
-0.3% [-0.5%, -0.1%] 11
Improvements ✅
(secondary)
-0.2% [-3.1%, -0.0%] 43
All ❌✅ (primary) 0.6% [-0.5%, 6.1%] 88

Bootstrap: 751.449s -> 756.74s (0.70%)
Artifact size: 339.00 MiB -> 338.92 MiB (-0.02%)

@rustbot rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Aug 24, 2024
@saethlin saethlin added S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 24, 2024
@saethlin saethlin force-pushed the ptr-read-write-precondition branch from 0a65e30 to 3b756c6 Compare August 28, 2024 00:42
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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 28, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Aug 28, 2024
…, r=<try>

Try enabling precondition checks on ptr::{read,write}

The overhead here is probably too much, but let's have the measurement anyway.

This will fail at least one codegen test.

r? `@ghost`
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bors commented Aug 28, 2024

⌛ Trying commit 3b756c6 with merge 4091821...

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bors commented Aug 28, 2024

☀️ Try build successful - checks-actions
Build commit: 4091821 (40918219c81cfdde936a6a9166876866d77b7d1f)

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Finished benchmarking commit (4091821): comparison URL.

Overall result: ❌✅ regressions and improvements - ACTION NEEDED

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

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

mean range count
Regressions ❌
(primary)
0.5% [0.2%, 1.6%] 32
Regressions ❌
(secondary)
0.9% [0.2%, 2.4%] 7
Improvements ✅
(primary)
-0.5% [-0.5%, -0.5%] 2
Improvements ✅
(secondary)
-1.6% [-1.6%, -1.6%] 1
All ❌✅ (primary) 0.5% [-0.5%, 1.6%] 34

Max RSS (memory usage)

Results (primary 1.1%, secondary -2.3%)

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)
9.5% [5.0%, 14.0%] 2
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-3.2% [-4.1%, -2.4%] 4
Improvements ✅
(secondary)
-2.3% [-3.4%, -1.7%] 6
All ❌✅ (primary) 1.1% [-4.1%, 14.0%] 6

Cycles

Results (primary 1.6%, secondary 1.7%)

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)
1.6% [1.1%, 2.4%] 7
Regressions ❌
(secondary)
2.5% [2.0%, 2.9%] 4
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-1.5% [-1.5%, -1.5%] 1
All ❌✅ (primary) 1.6% [1.1%, 2.4%] 7

Binary size

Results (primary 0.4%, secondary 0.6%)

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)
0.6% [0.0%, 6.2%] 62
Regressions ❌
(secondary)
1.2% [0.3%, 3.8%] 14
Improvements ✅
(primary)
-0.2% [-0.4%, -0.0%] 15
Improvements ✅
(secondary)
-0.4% [-3.1%, -0.0%] 9
All ❌✅ (primary) 0.4% [-0.4%, 6.2%] 77

Bootstrap: 752.135s -> 753.574s (0.19%)
Artifact size: 338.76 MiB -> 338.74 MiB (-0.01%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 28, 2024
};
let preserve_ub_checks =
attr::contains_name(tcx.hir().krate_attrs(), sym::rustc_preserve_ub_checks);
let remove_ub_checks = tcx.has_attr(def_id, sym::rustc_no_ubchecks);
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If we keep this attribute, the docs on the intrinsic should be updated.

@saethlin saethlin force-pushed the ptr-read-write-precondition branch from 3b756c6 to d527afc Compare August 29, 2024 22:32
@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 30, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Aug 30, 2024
…, r=<try>

Try enabling precondition checks on ptr::{read,write}

The overhead here is probably too much, but let's have the measurement anyway.

This will fail at least one codegen test.

r? `@ghost`

- [ ] Ralf says: If we keep this attribute, the docs on the intrinsic should be updated.
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bors commented Aug 30, 2024

⌛ Trying commit e001e0b with merge 89b5c9e...

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bors commented Aug 30, 2024

☀️ Try build successful - checks-actions
Build commit: 89b5c9e (89b5c9e1eb61f1414d7a3fa66591027d0a3a5725)

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@@ -45,7 +45,12 @@ impl<'tcx> MirPass<'tcx> for InstSimplify {
};
let preserve_ub_checks =
attr::contains_name(tcx.hir().krate_attrs(), sym::rustc_preserve_ub_checks);
let remove_ub_checks = tcx.has_attr(def_id, sym::rustc_no_ubchecks);
// FIXME(async_closures) tcx.has_attr on async closures seems to ICE. Not sure why.
let remove_ub_checks = if tcx.is_coroutine(def_id) {
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Finished benchmarking commit (89b5c9e): comparison URL.

Overall result: ❌✅ regressions and improvements - ACTION NEEDED

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

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

mean range count
Regressions ❌
(primary)
0.7% [0.2%, 3.2%] 27
Regressions ❌
(secondary)
0.4% [0.3%, 0.7%] 14
Improvements ✅
(primary)
-0.4% [-0.4%, -0.3%] 3
Improvements ✅
(secondary)
-1.2% [-2.9%, -0.4%] 3
All ❌✅ (primary) 0.6% [-0.4%, 3.2%] 30

Max RSS (memory usage)

Results (primary -0.0%, secondary -0.5%)

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)
1.4% [0.4%, 8.5%] 34
Regressions ❌
(secondary)
0.7% [0.4%, 1.3%] 29
Improvements ✅
(primary)
-1.0% [-4.8%, -0.4%] 49
Improvements ✅
(secondary)
-1.0% [-3.9%, -0.4%] 76
All ❌✅ (primary) -0.0% [-4.8%, 8.5%] 83

Cycles

Results (primary 0.4%, secondary 0.5%)

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)
0.8% [0.4%, 5.5%] 50
Regressions ❌
(secondary)
1.2% [0.4%, 5.4%] 85
Improvements ✅
(primary)
-0.9% [-3.0%, -0.4%] 15
Improvements ✅
(secondary)
-1.0% [-3.2%, -0.4%] 38
All ❌✅ (primary) 0.4% [-3.0%, 5.5%] 65

Binary size

Results (primary 0.8%)

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)
0.8% [0.0%, 6.0%] 31
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-0.1% [-0.2%, -0.1%] 2
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 0.8% [-0.2%, 6.0%] 33

Bootstrap: 788.226s -> 791.844s (0.46%)
Artifact size: 338.74 MiB -> 338.74 MiB (0.00%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 30, 2024
@saethlin saethlin force-pushed the ptr-read-write-precondition branch from e001e0b to 2986cc0 Compare September 1, 2024 21:17
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saethlin commented Sep 3, 2024

@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 3, 2024
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bors commented Sep 3, 2024

⌛ Trying commit 2986cc0 with merge 498c217...

bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 3, 2024
…, r=<try>

Try enabling precondition checks on ptr::{read,write}

The overhead here is probably too much, but let's have the measurement anyway.

This will fail at least one codegen test.

r? `@ghost`

- [ ] Ralf says: If we keep this attribute, the docs on the intrinsic should be updated.
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bors commented Sep 4, 2024

☀️ Try build successful - checks-actions
Build commit: 498c217 (498c21794ec20de1231252b78a9517c130cd0d9c)

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Finished benchmarking commit (498c217): comparison URL.

Overall result: ❌ regressions - ACTION NEEDED

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

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

mean range count
Regressions ❌
(primary)
0.7% [0.2%, 1.8%] 12
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-0.3% [-0.3%, -0.3%] 1
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 0.6% [-0.3%, 1.8%] 13

Max RSS (memory usage)

Results (primary 2.8%, secondary -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)
6.3% [3.5%, 10.5%] 5
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-3.1% [-3.4%, -2.7%] 3
Improvements ✅
(secondary)
-3.9% [-5.8%, -2.1%] 2
All ❌✅ (primary) 2.8% [-3.4%, 10.5%] 8

Cycles

Results (primary 1.4%)

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)
1.4% [1.3%, 1.5%] 3
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 1.4% [1.3%, 1.5%] 3

Binary size

Results (primary 0.2%)

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)
0.3% [0.0%, 5.6%] 49
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-0.2% [-0.6%, -0.1%] 7
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 0.2% [-0.6%, 5.6%] 56

Bootstrap: 750.76s -> 748.129s (-0.35%)
Artifact size: 338.30 MiB -> 338.29 MiB (-0.01%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 4, 2024
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saethlin commented Sep 4, 2024

@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 4, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 4, 2024
…, r=<try>

Try enabling precondition checks on ptr::{read,write}

The overhead here is probably too much, but let's have the measurement anyway.

This will fail at least one codegen test.

r? `@ghost`

- [ ] Ralf says: If we keep this attribute, the docs on the intrinsic should be updated.
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bors commented Sep 4, 2024

⌛ Trying commit f9b6f51 with merge bbda6ab...

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bors commented Sep 4, 2024

☀️ Try build successful - checks-actions
Build commit: bbda6ab (bbda6ab2cc1893c2fe3bf8d76027cea1c5c14416)

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Finished benchmarking commit (bbda6ab): comparison URL.

Overall result: ❌✅ regressions and improvements - ACTION NEEDED

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

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

mean range count
Regressions ❌
(primary)
0.5% [0.2%, 1.0%] 15
Regressions ❌
(secondary)
0.5% [0.3%, 0.6%] 3
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-2.6% [-2.6%, -2.6%] 1
All ❌✅ (primary) 0.5% [0.2%, 1.0%] 15

Max RSS (memory usage)

Results (primary 0.8%, secondary -2.6%)

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)
4.1% [2.3%, 5.5%] 4
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-3.7% [-4.2%, -3.0%] 3
Improvements ✅
(secondary)
-2.6% [-2.6%, -2.6%] 1
All ❌✅ (primary) 0.8% [-4.2%, 5.5%] 7

Cycles

Results (primary 1.5%)

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)
1.5% [0.9%, 2.0%] 2
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 1.5% [0.9%, 2.0%] 2

Binary size

Results (primary 0.2%, secondary 0.2%)

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)
0.3% [0.0%, 1.1%] 61
Regressions ❌
(secondary)
0.3% [0.1%, 0.4%] 11
Improvements ✅
(primary)
-0.2% [-0.3%, -0.1%] 6
Improvements ✅
(secondary)
-0.2% [-0.2%, -0.2%] 3
All ❌✅ (primary) 0.2% [-0.3%, 1.1%] 67

Bootstrap: 750.76s -> 751.514s (0.10%)
Artifact size: 338.30 MiB -> 338.40 MiB (0.03%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 4, 2024
@saethlin saethlin force-pushed the ptr-read-write-precondition branch from f9b6f51 to d8fcbdf Compare December 12, 2024 01:49
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The job x86_64-gnu-llvm-18 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)
#16 exporting to docker image format
#16 sending tarball 27.2s done
#16 DONE 39.7s
##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-18]
debug: `DISABLE_CI_RUSTC_IF_INCOMPATIBLE` configured.
---
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-18', '--enable-llvm-link-shared', '--set', 'rust.randomize-layout=true', '--set', 'rust.thin-lto-import-instr-limit=10', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--set', 'rust.lld=false', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-18/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.randomize-layout := True
configure: rust.thin-lto-import-instr-limit := 10
---
........................................................................................ 176/309
....................................................................i..........i........ 264/309

[mir-opt] tests/mir-opt/pre-codegen/ptr_offset.rs ... F
...........................................Some tests failed in compiletest suite=.mir-opt mode=mir-opt host=x86_64-unknown-linux-gnu target=x86_64-unknown-linux-gnu

failures:

---- [mir-opt] tests/mir-opt/pre-codegen/ptr_offset.rs stdout ----
---- [mir-opt] tests/mir-opt/pre-codegen/ptr_offset.rs stdout ----
10         scope 2 (inlined std::ptr::const_ptr::<impl *const u32>::cast::<u8>) {
11         }
12         scope 3 (inlined std::ptr::const_ptr::<impl *const u8>::add) {
+             scope 4 (inlined core::ub_checks::check_language_ub) {
+                 scope 5 (inlined core::ub_checks::check_language_ub::runtime) {
+             }
+             scope 6 (inlined std::mem::size_of::<u8>) {
+             }
13         }
13         }
-         scope 4 (inlined std::ptr::const_ptr::<impl *const u8>::with_metadata_of::<u32>) {
-             scope 5 (inlined std::ptr::metadata::<u32>) {
+         scope 7 (inlined std::ptr::const_ptr::<impl *const u8>::with_metadata_of::<u32>) {
+             scope 8 (inlined std::ptr::metadata::<u32>) {
16             }
-             scope 6 (inlined std::ptr::from_raw_parts::<u32, ()>) {
+             scope 9 (inlined std::ptr::from_raw_parts::<u32, ()>) {
19         }
20     }

thread '[mir-opt] tests/mir-opt/pre-codegen/ptr_offset.rs' panicked at src/tools/compiletest/src/runtest/mir_opt.rs:93:21:
thread '[mir-opt] tests/mir-opt/pre-codegen/ptr_offset.rs' panicked at src/tools/compiletest/src/runtest/mir_opt.rs:93:21:
Actual MIR output differs from expected MIR output /checkout/tests/mir-opt/pre-codegen/ptr_offset.demo_byte_add_thin.PreCodegen.after.panic-unwind.mir


failures:
    [mir-opt] tests/mir-opt/pre-codegen/ptr_offset.rs

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perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-libs Relevant to the library team, which will review and decide on the PR/issue.
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