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 Post subject: Smartbook make.conf
PostPosted: Wed Jul 17, 2013 9:45 pm 
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Joined: Wed May 02, 2012 1:36 pm
Posts: 13
Location: Germany
Hi!
I've been wondering whats the better choice of settings in the make.conf is for the EfikaMX Smartbook
Currently i set it like Funtoo's ARM stage3 default, or should i be setting -mfpu=neon instead?

CFLAGS="-O2 -pipe -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard"
CXXFLAGS="-O2 -pipe -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard"


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 Post subject: Re: Smartbook make.conf
PostPosted: Sun Jul 21, 2013 9:35 pm 
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Joined: Fri Sep 24, 2004 1:39 am
Posts: 86
Location: Central Europe
Quote:
Hi!
I've been wondering whats the better choice of settings in the make.conf is for the EfikaMX Smartbook
Currently i set it like Funtoo's ARM stage3 default, or should i be setting -mfpu=neon instead?

CFLAGS="-O2 -pipe -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard"
CXXFLAGS="-O2 -pipe -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard"
Hi, "better" is a relative term and you may want to simply test what works best for your application. If you plan to use "-mfpu=neon" and expect your code to be auto-vectorized by GCC, you will need to add '-funsafe-math-optimizations' which may cause a loss of precision.


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