[5.0] Reduce compile time for large strongly connected call graphs. #21805
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Improves SwiftSyntax release build speed by 4x. Limit the size of the sets tracked by inter procedural AccessedStorageAnalysis. There is a lot of leeway in this limit since "normal" code doesn't come close to hitting it and SwiftSyntax compile time isn't noticeably affected until 10x this limit. This change also avoids reanalyzing function bodies once results have bottomed out and avoids copying sets in the common case. Fixes <rdar://problem/46905624> Release build time regression, a lot of time spent on AccessEnforcementOpts::run(). This is just a band aid. The fundamental problem is really: <rdar://problem/47195282> Recomputing BottomUpIPAnalysis takes most of the SwiftSyntax compile time. SwiftSyntax compile time is still at least an order of magnitude longer than it should be. (cherry picked from commit 5b42469)
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@swift-ci test. |
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@swift-ci test source compatibility. |
atrick
changed the title
eeckstein
approved these changes
Jan 11, 2019
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@eeckstein this is ready to merge. |
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Improves SwiftSyntax release build speed by 4x.
Limit the size of the sets tracked by inter procedural
AccessedStorageAnalysis. There is a lot of leeway in this limit since
"normal" code doesn't come close to hitting it and SwiftSyntax compile
time isn't noticeably affected until 10x this limit.
This change also avoids reanalyzing function bodies once results have
bottomed out and avoids copying sets in the common case.
Fixes rdar://problem/46905624 Release build time regression, a lot of time spent on AccessEnforcementOpts::run().
This is just a band aid. The fundamental problem is really:
rdar://problem/47195282 Recomputing BottomUpIPAnalysis takes most of
the SwiftSyntax compile time.
SwiftSyntax compile time is still at least an order of magnitude
longer than it should be.
(cherry picked from commit 5b42469)