Agreed, I'm only interested in hardfloat versus softfloat ABI... Dave
On Wed, 2011-09-07 at 23:25 +0100, Mans Rullgard wrote: > On 7 September 2011 23:01, David Rusling <david.rusl...@linaro.org> wrote: > > I'm a little confused. There's two comparisons to be made. > > > > The comparison between vfp enabled in all cases, comparing using the > > soft float ABI with using the hard float ABI means that you'll identify > > the effect of moving VFP registers in and out of integer registers to > > make function call (soft float ABI) versus using them directly (hard > > float ABI). > > > > The comparision of using VFP at all versus only using integer emulation > > of floating point is separate and different. > > > > Both have an effect, the effects manifest themselves differently. > > I don't think we need to run any tests at all to know the outcome of > VFP (regardless of ABI) versus emulation. > > In addition to the above, a few applications have both floating-point > and fixed-point implementations of the same algorithms with a compile- > time choice of which is used. In these cases, a speed comparison is > of course of interest, although one must keep in mind that the output > is likely to be different, floating-point often having better accuracy. > -- David Rusling, CTO Linaro Lockton House Clarendon Rd Cambridge CB2 8FH Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
