[Libre-soc-dev] mp3 changes
cand at gmx.com
Fri May 28 11:55:33 BST 2021
On Fri, 28 May 2021 11:35:45 +0100
Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote:
> On Fri, May 28, 2021 at 11:25 AM Lauri Kasanen <cand at gmx.com> wrote:
> > There may be something more, perhaps FPSCR etc. I'm currently
> > investigating why int instrs work fine but float regs just stay zeroes.
> can you dump FPSCR and see what's set?
It's zero by default, which should be fine according to PowerISA-3.1.
Default rounding modes, exceptions all disabled, IEEE mode on.
> also... maybe, hmmm, on "native" ppc64 insert some print debug
> statements that obtain MSR and FPSCR and print them out.
MSR reading seems to require kernel privs. FPSCR didn't offer any
insight, it just enabled some exceptions.
More information about the Libre-soc-dev