JIT: Compute fgCalledCount after synthesis
#112041
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jakobbotsch
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Jan 31, 2025
I think #110693 just had to account for the entry block being different from cc @dotnet/jit-contrib. Diffs. Build Analysis caught the "no module named 'requests'" failure in Linux-arm64 CI, but it didn't flag it as a known error... |
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/ba-g blocked by dotnet/dnceng#4892. |
grendello
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* main: System.Net.Http.WinHttpHandler.StartRequestAsync assertion failed (dotnet#109799) Keep test PDB in helix payload for native AOT (dotnet#111949) Build the RID-specific System.IO.Ports packages in the VMR (dotnet#112054) Always inline number conversions (dotnet#112061) Use Contains{Any} in Regex source generator (dotnet#112065) Update dependencies from https://github.com/dotnet/arcade build 20250130.5 (dotnet#112013) JIT: Transform single-reg args to FIELD_LIST in physical promotion (dotnet#111590) Ensure that math calls into the CRT are tracked as needing vzeroupper (dotnet#112011) Use double.ConvertToIntegerNative where safe to do in System.Random (dotnet#112046) JIT: Compute `fgCalledCount` after synthesis (dotnet#112041) Simplify boolean logic in `TimeZoneInfo` (dotnet#112062) JIT: Update type when return temp is freshly created (dotnet#111948) Remove unused build controls and simplify DotNetBuild.props (dotnet#111986) Fix case-insensitive JSON deserialization of enum member names (dotnet#112028) WasmAppBuilder: Remove double computation of a value (dotnet#112047) Disable LTCG for brotli and zlibng. (dotnet#111805) JIT: Improve x86 unsigned to floating cast codegen (dotnet#111595) simplify x86 special intrinsic imports (dotnet#111836) JIT: Try to retain entry weight during profile synthesis (dotnet#111971) Fix explicit offset of ByRefLike fields. (dotnet#111584)
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Part of #107749. Follow-up to #111971 and #110693. For methods without profile data, ensure the default call count is available throughout compilation (this had no diffs for me locally). For methods with profile data, compute the call count after synthesis runs to ensure it is available early, and reasonably accurate.
I'm only seeing diffs in OSR methods locally, due to the logic in
fgFixEntryFlowForOSR(which runs right after profile incorporation) no longer affectingfgCalledCount. This method guesses that the loop iterates about 100x the method call count, and scales the method entry block's weight down accordingly. This gives the impression later on thatfgCalledCountis much lower than what we calculated usingfgEntryBB.The actual diffs seem to manifest largely in LSRA, which uses
fgCalledCountto normalize block weights, though there are a few other phases that useBasicBlock::getBBWeightin lieu of the raw weight as well. I think we ought to consolidate our block weight strategy at some point, especially if we have newfound faith infgCalledCount. For example, instead of this check in if conversion:Perhaps we could do:
But that's for another PR.