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llvm-project/llvm/test/Transforms/SampleProfile/Inputs/use-sample-profile-attr.prof

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[SampleFDO] Add use-sample-profile function attribute. When sampleFDO is enabled, people may expect they can use -fno-profile-sample-use to opt-out using sample profile for a certain file. That could be either for debugging purpose or for performance tuning purpose. However, when thinlto is enabled, if a function in file A compiled with -fno-profile-sample-use is imported to another file B compiled with -fprofile-sample-use, the inlined copy of the function in file B may still get its profile annotated. The inconsistency may even introduce profile unused warning because if the target is not compiled with explicit debug information flag, the function in file A won't have its debug information enabled (debug information will be enabled implicitly only when -fprofile-sample-use is used). After it is imported into file B which is compiled with -fprofile-sample-use, profile annotation for the outline copy of the function will fail because the function has no debug information, and that will trigger profile unused warning. We add a new attribute use-sample-profile to control whether a function will use its sample profile no matter for its outline or inline copies. That will make the behavior of -fno-profile-sample-use consistent. Differential Revision: https://reviews.llvm.org/D79959
2020-05-15 03:05:49 +08:00
foo:5860:10
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1: 1820
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goo:1820:20
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main:225715:1
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3.1: foo:5860
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4: goo:5860
1: 5860