On Fri, Sep 2, 2011 at 1:27 PM, Christian Robottom Reis <k...@linaro.org> wrote: > On Tue, Aug 30, 2011 at 11:24:59AM -0500, Zach Pfeffer wrote: >> I'd like you to meet Jim who did the initial hardfloat work. This >> email contains the results that Jim produced. > > Hmm, but the email seems to not actually contain a hard-float run. Or am > I misreading what he means by Fixed vs VFP? > >> I believe that the conclusion was that skia and webkit may benefit, >> but that such benefits would impose an undue burden on Android's >> distribution model which tries to create libs that can run on as many >> architectures as possible. > > You may be confusing things here. Hard-float is a pure software ABI > change, and any platform which supports VFP can use it if you build it > that way. However, since it is an ABI change it requires that hard-float > libraries be available. > > What /would/ stop code from running on certain platforms is using > NEON (it would exclude the Tegra2 and some existing Marvell v7s). But > that doesn't seem to be in question here.
Fwiw, VFP and NEON share same registers.. so as long as Tegra2 has VFP, I think it could use hard-float. Are we supporting any armv7-a that doesn't have at least VFP? Although I'm a bit lost on this topic, are we comparing non-hard-float-but-vfp-enabled (ie. fp op's not falling back to sw) vs hard-float? Or soft-float vs hard-float? BR, -R >> ---------- Forwarded message ---------- >> From: Jim Huang <js...@0xlab.org> >> Date: 7 August 2011 18:01 >> Subject: Re: Would you send me your hard float experiment results you >> presented in Budapest? >> To: Zach Pfeffer <zach.pfef...@linaro.org> >> >> >> 2011/8/7 Zach Pfeffer <zach.pfef...@linaro.org>: >> > Jim, >> > >> > Thanks. Would it be possible to post them by the end of the day? >> >> skia -> >> >> Switch from VFP back to fixed scalar based calculation >> >> Previous configuration enabled ARM VFP for scalar float, but VFP on >> ARM11 is not as powerful as VFPv3 or NEON. >> >> Reference benchmark: >> Item Fixed based VFP-based >> ------------ ----------- --------- >> Draw Canvas 58.37 fps 58.40 fps >> Draw Circle 37.48 fps 22.93 fps >> Draw Circle2 17.14 fps 18.31 fps >> Draw Rect 17.62 fps 20.69 fps >> Draw Arc 24.79 fps 27.45 fps >> Draw Image 19.08 fps 18.73 fps >> Draw Text 29.22 fps 25.79 fps >> >> >> > >> > Also, have you sync'd up with Mike? He wants to negotiate on your contract. >> >> I sent mail to Mike already. I don't know how to proceed. >> >> Thanks, >> -jserv > > > >> _______________________________________________ >> linaro-dev mailing list >> linaro-dev@lists.linaro.org >> http://lists.linaro.org/mailman/listinfo/linaro-dev > > -- > Christian Robottom Reis, Engineering VP > Brazil (GMT-3) | [+55] 16 9112 6430 | [+1] 612 216 4935 > Linaro.org: Open Source Software for ARM SoCs > > _______________________________________________ > linaro-dev mailing list > linaro-dev@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-dev > _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
