JIT: fix issues with profile incorporation phase #47723
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Change dotnet#47646 did not remove the code in `fgMakeBasicBlocks` that set profile data. That masked some flaws in `fgIncorporateProfileData`: * it should process all blocks; nothing has been imported yet * it must honor a constraint that some handler blocks can't be rare. This fixes the above, and removes the early profile setting.
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cc @dotnet/jit-contrib No diffs per SPMI (which includes PGO runs in crossgen). Verified locally dynamic PGO still happy. The artificial profile counts on handler entries lead to some code bloat we might want to avoid. Per SPMI impact is small, so not a high priority. Note there were some regressions too, my guess is those are cases where it can pay off to inline small methods in cold blocks. |
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Change #47646 did not remove the code in
fgMakeBasicBlocksthat set profiledata. That masked some flaws in
fgIncorporateProfileData:This fixes the above, and removes the early profile setting.