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
diff --git a/cc/afdo.go b/cc/afdo.go
index 49f6987..137ea97 100644
--- a/cc/afdo.go
+++ b/cc/afdo.go
@@ -34,7 +34,7 @@
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)