From 3ccc52fb0bf11d6cfb104a80b1bdbc81bac0e37d Mon Sep 17 00:00:00 2001
From: Yi Kong <yikong@google.com>
Date: Wed, 22 Mar 2023 17:09:50 +0900
Subject: [PATCH] Opt libhwui out of -fprofile-sample-accurate

Some hwui code paths might be infrequently executed but critical to the
UI latency. Opt out of -fprofile-sample-accurate so that the compiler
won't de-optimise cold code paths.

Test: presubmit
Bug: 273415627
Change-Id: Ieaf34fc0d2e75aa54c46fec0fde38cee42a5c3c3
---
 libs/hwui/Android.bp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index 979a660d497f4..d391be665371b 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -55,6 +55,10 @@ cc_defaults {
         // GCC false-positives on this warning, and since we -Werror that's
         // a problem
         "-Wno-free-nonheap-object",
+
+        // Do not de-optimise cold code paths in AFDO.
+        // Some code paths might be infrequently executed but critical to latency.
+        "-fno-profile-sample-accurate",
     ],
 
     include_dirs: [