> On Jan 7, 2016, at 3:40 PM, Phil Blundell <p...@pbcl.net> wrote: > > On Thu, 2016-01-07 at 14:29 -0800, Andre McCurdy wrote: >> FULL_OPTIMIZATION_armv7a = "-fexpensive-optimizations -fomit-frame-pointer >> -O4 -ffast-math" >> +FULL_OPTIMIZATION_armv7ve = "-fexpensive-optimizations -fomit-frame-pointer >> -O4 -ffast-math" >
O4 ? may be just replace this whole thing with -Ofast now a days -fexpensive-optimizations is enabled at -O2,-O3 anyway same for fomit-frame-pointer and -Ofast turns on feast-match on top of -O3 > I wonder if this would be better as just FULL_OPTIMIZATION_arm. That > said, the OPTIMIZATION variables are primarily distro knobs and it's not > entirely clear that individual packages ought to be overriding them at > all. > > Does anybody know whether there is any actual science behind the use of > those flags on armv7a specifically? it came into ffmpeg circa 2008 and proliferated into related components primarily to support vectorization and neon which was quite nascent for ARM architecture in those days in gcc. Today if you were to configure libav with default options then it uses mainly -fomit-frame-pointer-O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize which is primarily -Ofast -fno-tree-vectorize > > p. > > > -- > _______________________________________________ > Openembedded-core mailing list > Openembedded-core@lists.openembedded.org > http://lists.openembedded.org/mailman/listinfo/openembedded-core
signature.asc
Description: Message signed with OpenPGP using GPGMail
-- _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-core
