On Thu, Jul 05, 2018 at 12:51:00PM -0400, Programmingkid wrote: > > > On Jul 5, 2018, at 12:48 PM, Richard Henderson > > <richard.hender...@linaro.org> wrote: > > > > On 07/05/2018 09:31 AM, Programmingkid wrote: > >>> On Jul 3, 2018, at 11:17 AM, Richard Henderson > >>> <richard.hender...@linaro.org> wrote: > >>> > >>> Memory operations have no side effects on fp state. > >>> The use of a "real" conversions between float64 and float32 > >>> would raise exceptions for SNaN and out-of-range inputs. > >> > >> Would you have any documentation that tells us about converting > >> between 64 bit and 32 bit floating points? > > > > Spelled out right at the beginning of sections 4.6 (load) and 4.7 (store) of > > Book 1 of the Power ISA manual (version 3.0B) [0]. > > > > I've double-checked vs RISU[1] testing of LFS and STFS, with master traces > > generated on Power 8 ppc64le, so I don't see anything immediately wrong with > > the patch. But I haven't had time to look further than that. > > > > > > r~ > > > > > > [0] https://openpowerfoundation.org/?resource_lib=power-isa-version-3-0 > > [1] https://git.linaro.org/people/peter.maydell/risu.git > > Thank you for the documentation. My guess is there are differences > between the PowerPC and Power 8 implementations.
That seems very, very unlikely to me.
> PowerPC is big
> endian. Would you be able to do your testing again with your Power 8
> CPU in big endian mode?
>
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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