Closed
Description
Code
Applications including https://github.com/xiph/rav1e , including the repo's example, never complete compilation in --release. I waited over an hour on my 2019 desktop (i7-8700k).
I tested f8b95d97517a6e223f1c6a90a467188586dd090f.
$ CARGO_INCREMENTAL=0 cargo +beta build --no-default-features --example simple_encoding --release
Version it worked on
It most recently worked on: rustc 1.73.0-nightly (03a119b 2023-08-07)
Stable is fine: rustc 1.72.1 (d5c2e9c 2023-09-13)
rustc 1.73.0-nightly (03a119b0b 2023-08-07)
binary: rustc
commit-hash: 03a119b0b0e310d22d94399b24ed030056050f13
commit-date: 2023-08-07
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5
Version with regression
rustc --version --verbose:
rustc 1.73.0-beta.6 (9b9539791 2023-09-17)
binary: rustc
commit-hash: 9b95397915e672e76c43eb013289bca7b9a23370
commit-date: 2023-09-17
host: x86_64-unknown-linux-gnu
release: 1.73.0-beta.6
LLVM version: 17.0.0
rustc 1.73.0-nightly (f88a8b71c 2023-08-08)
binary: rustc
commit-hash: f88a8b71cebb730cbd5058c45ebcae1d4d9be377
commit-date: 2023-08-08
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 17.0.0
I can only assume this is the new LLVM: #114048
@rustbot modify labels: +regression-from-stable-to-beta -regression-untriaged
Thoughts
If you add random panics in places, the compilation speeds up. The end of the main loop is a good candidate, this can bring the compile time down to only a few minutes (still a massive regression).
For this, --timings doesn't seem to know what's up: https://b.goeswhere.com/cargo-timing-20230921T083504Z.html
RUSTFLAGS='-Z time-llvm-passes' produces a bunch of output, including this one? I don't know how to read this output and I expect anyone who can is able to reproduce the problem, so I'm not including it in full.
00:01:46 ===-------------------------------------------------------------------------===
00:01:46 Pass execution timing report
00:01:46 ===-------------------------------------------------------------------------===
00:01:46 Total Execution Time: 104.3365 seconds (101.2781 wall clock)
00:01:46-
00:01:46 ---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
00:01:46 82.7290 ( 86.1%) 7.8338 ( 95.0%) 90.5628 ( 86.8%) 90.5593 ( 89.4%) GVNPass
00:01:46 5.1964 ( 5.4%) 0.2020 ( 2.4%) 5.3984 ( 5.2%) 3.8898 ( 3.8%) SimpleLoopUnswitchPass
00:01:46 3.2395 ( 3.4%) 0.0006 ( 0.0%) 3.2401 ( 3.1%) 3.2407 ( 3.2%) LoopSimplifyPass
00:01:46 1.3124 ( 1.4%) 0.0090 ( 0.1%) 1.3214 ( 1.3%) 1.3228 ( 1.3%) IndVarSimplifyPass
00:01:46 1.0127 ( 1.1%) 0.0333 ( 0.4%) 1.0460 ( 1.0%) 0.7634 ( 0.8%) InstCombinePass
00:01:46 0.3558 ( 0.4%) 0.0043 ( 0.1%) 0.3601 ( 0.3%) 0.2950 ( 0.3%) SimplifyCFGPass
00:01:46 0.1910 ( 0.2%) 0.0047 ( 0.1%) 0.1957 ( 0.2%) 0.1844 ( 0.2%) SCCPPass
00:01:46 0.1673 ( 0.2%) 0.0012 ( 0.0%) 0.1685 ( 0.2%) 0.1681 ( 0.2%) LoopFullUnrollPass
00:01:46 0.3241 ( 0.3%) 0.0189 ( 0.2%) 0.3430 ( 0.3%) 0.1667 ( 0.2%) LICMPass
00:01:46 0.1501 ( 0.2%) 0.0019 ( 0.0%) 0.1520 ( 0.1%) 0.1510 ( 0.1%) LoopIdiomRecognizePass
00:01:46 0.2368 ( 0.2%) 0.0145 ( 0.2%) 0.2514 ( 0.2%) 0.1318 ( 0.1%) LoopSimplifyCFGPass
00:01:46 0.1849 ( 0.2%) 0.0208 ( 0.3%) 0.2057 ( 0.2%) 0.1049 ( 0.1%) LoopInstSimplifyPass
00:01:46 0.1198 ( 0.1%) 0.0219 ( 0.3%) 0.1416 ( 0.1%) 0.0775 ( 0.1%) InlinerPass
00:01:46 0.0270 ( 0.0%) 0.0035 ( 0.0%) 0.0304 ( 0.0%) 0.0301 ( 0.0%) LoopDeletionPass
00:01:46 0.2481 ( 0.3%) 0.0184 ( 0.2%) 0.2666 ( 0.3%) 0.0288 ( 0.0%) SROAPass
00:01:46 0.0330 ( 0.0%) 0.0013 ( 0.0%) 0.0344 ( 0.0%) 0.0237 ( 0.0%) JumpThreadingPass
00:01:46 0.0896 ( 0.1%) 0.0058 ( 0.1%) 0.0954 ( 0.1%) 0.0173 ( 0.0%) EarlyCSEPass
00:01:46 0.0264 ( 0.0%) 0.0020 ( 0.0%) 0.0284 ( 0.0%) 0.0152 ( 0.0%) CorrelatedValuePropagationPass
00:01:46 0.0159 ( 0.0%) 0.0004 ( 0.0%) 0.0163 ( 0.0%) 0.0135 ( 0.0%) LCSSAPass
00:01:46 0.0257 ( 0.0%) 0.0013 ( 0.0%) 0.0270 ( 0.0%) 0.0130 ( 0.0%) LoopRotatePass
00:01:46 0.1138 ( 0.1%) 0.0127 ( 0.2%) 0.1265 ( 0.1%) 0.0105 ( 0.0%) IPSCCPPass
00:01:46 0.0801 ( 0.1%) 0.0131 ( 0.2%) 0.0931 ( 0.1%) 0.0089 ( 0.0%) GlobalOptPass
00:01:46 0.0267 ( 0.0%) 0.0027 ( 0.0%) 0.0294 ( 0.0%) 0.0070 ( 0.0%) PostOrderFunctionAttrsPass
00:01:46 0.0117 ( 0.0%) 0.0011 ( 0.0%) 0.0127 ( 0.0%) 0.0067 ( 0.0%) DSEPass
00:01:46 0.0121 ( 0.0%) 0.0009 ( 0.0%) 0.0130 ( 0.0%) 0.0063 ( 0.0%) ADCEPass
00:01:46 0.0089 ( 0.0%) 0.0003 ( 0.0%) 0.0092 ( 0.0%) 0.0062 ( 0.0%) VectorCombinePass
00:01:46 0.0087 ( 0.0%) 0.0007 ( 0.0%) 0.0095 ( 0.0%) 0.0055 ( 0.0%) BDCEPass
00:01:46 0.0100 ( 0.0%) 0.0025 ( 0.0%) 0.0125 ( 0.0%) 0.0055 ( 0.0%) MemCpyOptPass
00:01:46 0.0489 ( 0.1%) 0.0064 ( 0.1%) 0.0553 ( 0.1%) 0.0051 ( 0.0%) CalledValuePropagationPass
00:01:46 0.0096 ( 0.0%) 0.0012 ( 0.0%) 0.0109 ( 0.0%) 0.0027 ( 0.0%) ArgumentPromotionPass
00:01:46 0.0061 ( 0.0%) 0.0004 ( 0.0%) 0.0065 ( 0.0%) 0.0024 ( 0.0%) MergedLoadStoreMotionPass
00:01:46 0.0042 ( 0.0%) 0.0004 ( 0.0%) 0.0046 ( 0.0%) 0.0024 ( 0.0%) ReassociatePass
00:01:46 0.0046 ( 0.0%) 0.0004 ( 0.0%) 0.0051 ( 0.0%) 0.0019 ( 0.0%) ConstraintEliminationPass
00:01:46 0.0147 ( 0.0%) 0.0005 ( 0.0%) 0.0152 ( 0.0%) 0.0016 ( 0.0%) LowerExpectIntrinsicPass
00:01:46 0.0115 ( 0.0%) 0.0011 ( 0.0%) 0.0126 ( 0.0%) 0.0015 ( 0.0%) RequireAnalysisPass<llvm::GlobalsAA, llvm::Module, llvm::AnalysisManager<Module>>
00:01:46 0.0027 ( 0.0%) 0.0003 ( 0.0%) 0.0029 ( 0.0%) 0.0013 ( 0.0%) TailCallElimPass
00:01:46 0.0022 ( 0.0%) 0.0004 ( 0.0%) 0.0025 ( 0.0%) 0.0010 ( 0.0%) AggressiveInstCombinePass
00:01:46 0.0065 ( 0.0%) 0.0006 ( 0.0%) 0.0071 ( 0.0%) 0.0008 ( 0.0%) PromotePass
00:01:46 0.0014 ( 0.0%) 0.0002 ( 0.0%) 0.0017 ( 0.0%) 0.0005 ( 0.0%) RequireAnalysisPass<llvm::ShouldNotRunFunctionPassesAnalysis, llvm::Function, llvm::AnalysisManager<Function>>
00:01:46 0.0027 ( 0.0%) 0.0001 ( 0.0%) 0.0028 ( 0.0%) 0.0005 ( 0.0%) CallSiteSplittingPass
00:01:46 0.0010 ( 0.0%) 0.0001 ( 0.0%) 0.0011 ( 0.0%) 0.0004 ( 0.0%) LibCallsShrinkWrapPass
00:01:46 0.0034 ( 0.0%) 0.0003 ( 0.0%) 0.0038 ( 0.0%) 0.0004 ( 0.0%) InvalidateAnalysisPass<llvm::AAManager>
00:01:46 0.0003 ( 0.0%) 0.0000 ( 0.0%) 0.0003 ( 0.0%) 0.0003 ( 0.0%) DeadArgumentEliminationPass
00:01:46 0.0041 ( 0.0%) 0.0000 ( 0.0%) 0.0041 ( 0.0%) 0.0003 ( 0.0%) InferFunctionAttrsPass
00:01:46 0.0002 ( 0.0%) 0.0000 ( 0.0%) 0.0002 ( 0.0%) 0.0002 ( 0.0%) GlobalDCEPass
00:01:46 0.0054 ( 0.0%) 0.0002 ( 0.0%) 0.0056 ( 0.0%) 0.0002 ( 0.0%) OpenMPOptCGSCCPass
00:01:46 0.0004 ( 0.0%) 0.0001 ( 0.0%) 0.0005 ( 0.0%) 0.0002 ( 0.0%) MoveAutoInitPass
00:01:46 0.0006 ( 0.0%) 0.0001 ( 0.0%) 0.0006 ( 0.0%) 0.0002 ( 0.0%) CoroSplitPass
00:01:46 0.0009 ( 0.0%) 0.0001 ( 0.0%) 0.0010 ( 0.0%) 0.0002 ( 0.0%) CoroElidePass
00:01:46 0.0005 ( 0.0%) 0.0001 ( 0.0%) 0.0006 ( 0.0%) 0.0002 ( 0.0%) SpeculativeExecutionPass
00:01:46 0.0001 ( 0.0%) 0.0000 ( 0.0%) 0.0001 ( 0.0%) 0.0001 ( 0.0%) NameAnonGlobalPass
00:01:46 0.0001 ( 0.0%) 0.0000 ( 0.0%) 0.0001 ( 0.0%) 0.0001 ( 0.0%) InvalidateAnalysisPass<llvm::ShouldNotRunFunctionPassesAnalysis>
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) AnnotationRemarksPass
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) RequireAnalysisPass<llvm::ProfileSummaryAnalysis, llvm::Module, llvm::AnalysisManager<Module>>
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) OpenMPOptPass
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) CoroEarlyPass
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Annotation2MetadataPass
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) ForceFunctionAttrsPass
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) CoroCleanupPass
00:01:46 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) CanonicalizeAliasesPass
00:01:46 96.0900 (100.0%) 8.2465 (100.0%) 104.3365 (100.0%) 101.2781 (100.0%) Total