From 95c9e96d0c7e9f5375c3c50596fffb5991205f10 Mon Sep 17 00:00:00 2001
From: Jonathan Wright <jonathan.wright@arm.com>
Date: Mon, 20 Apr 2020 18:01:17 +0200
Subject: libpng: optimize for speed on Arm platforms

Change libpng build configuration to optimize for speed on Arm
platforms. This allows the compiler to inline some of the NEON filter
functions and significantly increase performance.

Binary size increase is minimal (<10KB increase in normalized Android
APK size.)

Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1071398
Chromium-Change-Id: I109dea8b490bfdd2c0a80e2f1259797f1485e14f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149331
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Reviewed-by: Chris Blume <cblume@chromium.org>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Cr-Commit-Position: refs/heads/master@{#760551}
[This was originally applied to BUILD.gn in Chromium
 and I ported the change to Android.bp.]

Change-Id: I5e5aa40cce2c82b2c13947c3fecb44c86d2f3076
---
 Android.bp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Android.bp b/Android.bp
index 72cd34066..8479aaa65 100644
--- a/Android.bp
+++ b/Android.bp
@@ -17,9 +17,11 @@ cc_defaults {
     arch: {
         arm: {
             srcs: ["arm/*"],
+            cflags: ["-O3"],
         },
         arm64: {
             srcs: ["arm/*",],
+            cflags: ["-O3"],
         },
         x86: {
             srcs: ["intel/*"],
-- 
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