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afdo: Remove -fprofile-sample-accurate flag

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-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
(cherry picked from https://android-review.googlesource.com/q/commit:febf8b9bdf40b086a50930901a7ccfaaa628bcba)
Merged-In: I1016f573f21a60223a97c64f5818f0e7e66e41e3
Change-Id: I1016f573f21a60223a97c64f5818f0e7e66e41e3
This commit is contained in:
Yi Kong
2023-06-06 16:17:58 +08:00
committed by Cherrypicker Worker
parent 98f13dd1a0
commit 9825a6c7f8
1 changed files with 1 additions and 1 deletions
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cc/afdo.go
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@@ -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)