Updating the makefile to have armv7=0 should do it, but I never tried. Rodolph.
On 3 September 2012 12:50, Kevin Read <[email protected]> wrote: > Hi Rodolph, > > I see, thanks. Do you know if this also applies to the android_arm target? > The Makefile.android states that v7 is active and neon off. Would I have to > change the Makefile to create an armv5 build? > > Cheers, > Kevin > > On 03.09.2012, at 13:16, Rodolph Perfetta wrote: > >> Hi Kevin, >> >> The standalone V8 for ARM builds for armv7+vfpv3 by default using gyp. >> >> V8 has two compilers, one non optimising which compiles everything the >> first time and an optimising compiler (crankshaft) for hotspots. To >> use crankshaft on ARM you need armv7+vfpv3. The non optimising >> compiler works on armv5 (and probably armv4). If performance is >> important then crankshaft is a must. >> >> Note that V8 will check the CPU at runtime so even if statically >> compiled for armv5 it may use cranckshaft when running. >> >> NEON is a SIMD engine and JS VM currently don't emit SIMD like code. >> >> Cheers, >> Rodolph. >> >> On 2 September 2012 22:15, Paul Lind <[email protected]> wrote: >>> Hi Kevin - >>> >>> Regarding your MIPS question, you are best off pulling from Google's release >>> branches, which match up to major Chrome releases. Those will have received >>> the most testing, on all platforms. The latest right now is 3.12, and >>> Android Jelly Bean is using 3.9, if that matters to you at all. >>> >>> As you may or may not know, the MIPS port is developed by our outside team, >>> and on any given day we may not have finished porting necessary to work with >>> recent changes the Google team has made. Roughly once a week, they push to >>> trunk, and we currently don't sync up with them on these pushes. So MIPS may >>> be broken in trunk. We definitely do sync up on the release branches, and >>> get everything thoroughly tested. >>> >>> We do keep the code at our own repo (https://github.com/paul99/v8m-rb) >>> working and our bleeding_edge branch will match theirs (though possibly a >>> day or two behind as port changes). So far there has not been demand for >>> keeping 'trunk' in sync for MIPS. But again, our bleeding_edge and theirs >>> can be broken at a given moment in time, so release branches are your best >>> bet for product development. >>> >>> I don't know the answer to all your ARM questions, but I do know that Neon >>> is not used in v8, however the VFP3 floating point is required for the >>> optimizing (crankshaft) compiler. >>> >>> thanks, >>> >>> paul >>> >>> >>> >>> On Sep 2, 2012, at 10:55 AM, Kevin Read wrote: >>> >>> Hi all, >>> >>> I succeeded in using v8 via JNI and the ndk from within my android app. The >>> idea here is to reuse existing JS code but with performance improvements. I >>> have some questions regarding the build flags for the different >>> architectures. >>> >>> I was under the impression that v8 builds for ARMv5 by default. Is that >>> correct? I also read somewhere that when compiled for ARMv5 v8 would not use >>> the JIT and so performance would suffer. In any case, how would I go about >>> compiling for ARMv5 or ARMv7 explicitly? >>> Would it make sense to compile v8 with softfp and/or neon? I'm working with >>> fairly math intensive code. >>> >>> I would also like to investigate building for MIPS, so that I have all >>> tablet hardware covered. Can I use trunk for that at the moment, or should I >>> try to work with the code from https://github.com/paul99/v8m-rb/? >>> >>> Thanks for your input, and for this best of JS VMs :) >>> >>> Regards, >>> Kevin >>> >>> >>> -- >>> v8-users mailing list >>> [email protected] >>> http://groups.google.com/group/v8-users >>> >>> >>> -- >>> v8-users mailing list >>> [email protected] >>> http://groups.google.com/group/v8-users >> >> -- >> v8-users mailing list >> [email protected] >> http://groups.google.com/group/v8-users > > -- > v8-users mailing list > [email protected] > http://groups.google.com/group/v8-users -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users
