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Re: [Qemu-ppc] [PATCH v1] target/ppc: rewrite f[n]m[add, sub] using floa

From: Nikunj A Dadhania
Subject: Re: [Qemu-ppc] [PATCH v1] target/ppc: rewrite f[n]m[add, sub] using float64_muladd
Date: Thu, 02 Mar 2017 10:33:05 +0530
User-agent: Notmuch/0.21 (https://notmuchmail.org) Emacs/ (x86_64-redhat-linux-gnu)

Oh, some gmail issues, resending:

> On 02-Mar-2017 7:53 AM, "Richard Henderson" <address@hidden> wrote:
> On 03/02/2017 11:29 AM, David Gibson wrote:
>> On Wed, Mar 01, 2017 at 08:54:14PM +0530, Nikunj A Dadhania wrote:
>>> Use the softfloat api for fused multiply-add. Also, generate VXISI using
>>> a helper function by computing intermediate result.
>> Um.. I really need some information on why this is a good thing to
>> do.  Is it a bugfix?  Enhancement? Simplification?
> Looks like a bugfix to me.  Previously we were attempting the operation via
> float128 as an intermediate type, which can result in double rounding
> errors.

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