A simple test of performance with matrix multiplications using the NEON instruction set.
To switch between NEON and not, just go Matrix4.hx and change:
#define USE_NEON 1
In order for it to work on android you need to change the android-toolchain.xml in HXCPP or HXLIBC (whatever you are using). On this part:
<section if="HXCPP_ARMV7">
<flag value="-march=armv7-a" />
<flag value="-mfpu=vfpv3-d16" />
<flag value="-mfloat-abi=softfp" />
</section>
change to:
<section if="HXCPP_ARMV7">
<flag value="-march=armv7-a" />
<flag value="-mfpu=neon" />
<flag value="-mfloat-abi=softfp" />
</section>
I found that while there is a noticeable improvement on iOS, on Android it is actually worse. That lead me to this:http://www.crickettechnology.com/blog/?p=691 . The problem seems to be gcc... Changing to clang might fix this, and android can be compiled with clang.
iOS iPad Mini Retina - With Neon
Main.hx:33: took:3.006291634
Main.hx:33: took:3.365333308
Main.hx:33: took:3.007791645
Main.hx:33: took:6.63037505
Main.hx:33: took:3.196291684
Main.hx:33: took:3.016708302
Main.hx:33: took:6.496416696
Main.hx:33: took:3.032041714
Main.hx:33: took:2.63379165
Main.hx:33: took:2.626083384
Main.hx:33: took:2.62754166
Main.hx:33: took:2.627458307
Main.hx:33: took:2.903208311
Main.hx:33: took:2.610249969
Main.hx:33: took:2.707916661
Main.hx:33: took:3.505166678
iOS iPad Mini Retina - Without Neon
Main.hx:33: took:13.77933333
Main.hx:33: took:13.72462499
Main.hx:33: took:13.77220836
Main.hx:33: took:13.82629166
Main.hx:33: took:14.00537498
Main.hx:33: took:18.24145834
Main.hx:33: took:13.73891666
Main.hx:33: took:14.85312503
Main.hx:33: took:13.63754168
Main.hx:33: took:13.83866667
Main.hx:33: took:13.86112504
Main.hx:33: took:14.59758333
Main.hx:33: took:13.78233329
Main.hx:33: took:13.96004163
Android Archos 97 Platinum HD - With Neon
I/trace (19349): Main.hx:33: took:34.923958
I/trace (19349): Main.hx:33: took:35.0315
I/trace (19349): Main.hx:33: took:35.153416
I/trace (19349): Main.hx:33: took:34.603667
I/trace (19349): Main.hx:33: took:36.22825
I/trace (19349): Main.hx:33: took:33.995375
I/trace (19349): Main.hx:33: took:36.841792
I/trace (19349): Main.hx:33: took:34.094334
I/trace (19349): Main.hx:33: took:36.8305
I/trace (19349): Main.hx:33: took:36.183875
I/trace (19349): Main.hx:33: took:34.277542
I/trace (19349): Main.hx:33: took:37.071042
I/trace (19349): Main.hx:33: took:34.507292
I/trace (19349): Main.hx:33: took:34.503375
Android Archos 97 Platinum HD - Without Neon
I/trace (12339): Main.hx:33: took:28.631666
I/trace (12339): Main.hx:33: took:30.682416
I/trace (12339): Main.hx:33: took:28.127459
I/trace (12339): Main.hx:33: took:31.157834
I/trace (12339): Main.hx:33: took:27.715458
I/trace (12339): Main.hx:33: took:31.206625
I/trace (12339): Main.hx:33: took:27.918917
I/trace (12339): Main.hx:33: took:30.78
I/trace (12339): Main.hx:33: took:28.565917
I/trace (12339): Main.hx:33: took:29.833458
I/trace (12339): Main.hx:33: took:28.422917
I/trace (12339): Main.hx:33: took:30.684416
I/trace (12339): Main.hx:33: took:27.627959
I/trace (12339): Main.hx:33: took:30.856667