Commit febf8b9b authored Jun 06, 2023 by Yi Kong

afdo: Remove -fprofile-sample-accurate flag

-fprofile-sample-accurate allows the compiler to de-optimize cold code
paths according to the profile. However we have a number of micro-
benchmarks that tests these paths and we often trigger regression
reports from those benchmarks.

Turning off the flag mitigates the issue at a cost of ~2MB increase in
system image size. But the more deterministic codegen could reduce the
differential OTA size.

Test: presubmit
Bug: 283235002
Change-Id: I1016f573f21a60223a97c64f5818f0e7e66e41e3

parent 2a97e1dc

cc/afdo.go

+1 −1

Original line number	Diff line number	Diff line
		@@ -34,7 +34,7 @@ var (

		var afdoProfileProjectsConfigKey = android.NewOnceKey("AfdoProfileProjects")

		const afdoCFlagsFormat = "-fprofile-sample-accurate -fprofile-sample-use=%s"
		const afdoCFlagsFormat = "-fprofile-sample-use=%s"

		func recordMissingAfdoProfileFile(ctx android.BaseModuleContext, missing string) {
		getNamedMapForConfig(ctx.Config(), modulesMissingProfileFileKey).Store(missing, true)