HI Bero, <div><br></div><div>What I did was changing both Os and O2 to O3 in TARGET_linux-arm.mk. I did not change those O2/Os specified in each module internally. As there may be a reason for the module itself to specify the optimisation level. I think it is risky to change those. But I don&#39;t think it should be a big problem. </div>
<div><br></div><div>Thanks and regards</div><div>Chao <br><div><br><div class="gmail_quote">On 19 August 2011 15:38, Bernhard Rosenkranzer <span dir="ltr">&lt;<a href="mailto:bernhard.rosenkranzer@linaro.org">bernhard.rosenkranzer@linaro.org</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi,<br>
<div class="im"><br>
On 18 August 2011 19:40, Chao Yang &lt;<a href="mailto:chao.yang@linaro.org">chao.yang@linaro.org</a>&gt; wrote:<br>
&gt; The results can be found<br>
&gt; at <a href="https://wiki.linaro.org/ChaoYang/Sandbox/gccoptimization" target="_blank">https://wiki.linaro.org/ChaoYang/Sandbox/gccoptimization</a>.<br>
<br>
</div>Interesting... I&#39;d have expected getting rid of -fno-strict-aliasing<br>
gives the biggest performance boost, but I&#39;d have expected O3 to be a<br>
bit more effective than it is...<br>
Are you sure the relevant parts actually use O3 (keep in mind that<br>
e.g. -O3 + -Os = -Os -- whatever is specified later (LOCAL_CFLAGS,<br>
...) is effective)?<br>
<br>
Could you add another combination to the benchmark? I&#39;m curious about<br>
-O3 -fno-inline-functions (function inlining is always a bit of a<br>
2-edged sword because of the code size increases...)<br>
<br>
ttyl<br>
bero<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br>
</span></div>Chao Yang<br>Android Platform Team<br><div style="color:rgb(80, 0, 80)">Linaro.org │ Open source software for ARM SoCs<br>Follow Linaro:<br></div><a href="http://www.facebook.com/pages/Linaro/155974581091106" style="color:rgb(0, 0, 204)" target="_blank">http://www.facebook.com/pages/Linaro/155974581091106</a><br>
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