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Re: [Qemu-ppc] [Qemu-devel] [PATCH] ppc: Three floating point fixes

From: David Gibson
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] ppc: Three floating point fixes
Date: Thu, 22 Aug 2019 13:02:34 +1000
User-agent: Mutt/1.12.1 (2019-06-15)

On Tue, Aug 20, 2019 at 11:35:29AM +0100, Peter Maydell wrote:
> On Tue, 20 Aug 2019 at 08:36, David Gibson <address@hidden> wrote:
> > On Mon, Aug 19, 2019 at 12:13:34PM -0500, Paul Clarke wrote:
> > > These issues were found while running Glibc's test suite for "math",
> > > and there are still a *LOT* of QEMU-only FAILs, so I may be back
> > > again with suggested fixes or questions.  :-)
> >
> > That doesn't greatly surprise me, TCG's ppc target stuff is only so-so
> > tested, TBH.
> You might also consider using/extending the risu test cases for
> ppc64 -- individual checks of each insn against a known-good
> implementation can be easier to track down bugs than trying
> to figure out why a higher-level test suite like the glibc one
> has reported a failure, IME. (There are already risu patterns
> for XSCVDPSP and XSCVDPSPN, so I think that bug at least ought
> to be found by risu if you run it against the right h/w as
> known-good reference...)

Oh, I'd love to.  I tried running risu once, it failed cryptically and
I haven't had time to investigate deeper.

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_!

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