On Wed, Sep 21, 2011 at 05:01:31PM -0400, David Miller wrote:
> From: Michael Meissner
> Date: Thu, 15 Sep 2011 14:16:45 -0400
>
> > On the powerpc, we have an issue with Spec 2006 and calculix when FMAs are
> > generated and -ffast-math is used, where line 307 of rubber.f is:
> >
> > tt=dat
From: Michael Meissner
Date: Thu, 15 Sep 2011 14:16:45 -0400
> On the powerpc, we have an issue with Spec 2006 and calculix when FMAs are
> generated and -ffast-math is used, where line 307 of rubber.f is:
>
> tt=datan2(dsqrt(1.d0-cn*cn),cn)/3.d0
>
> The FNMSUB instruction generates a -0.
From: Eric Botcazou
Date: Fri, 16 Sep 2011 22:53:09 +0200
>> There have never been TFmode float operations implemented in hardware
>> ever for sparc, and I doubt we'll see it in the future.
>>
>> And this applies also to the FMA instructions.
>
> Do the specs totally disregard quad floats for FM
> There have never been TFmode float operations implemented in hardware
> ever for sparc, and I doubt we'll see it in the future.
>
> And this applies also to the FMA instructions.
Do the specs totally disregard quad floats for FMA or...?
> And especially since the presence of the FMA patterns is
From: Eric Botcazou
Date: Fri, 16 Sep 2011 22:25:41 +0200
> What's the story with TFmode for FMA?
There have never been TFmode float operations implemented in hardware
ever for sparc, and I doubt we'll see it in the future.
And this applies also to the FMA instructions.
And especially since th
> Second, like rs6000 the sparc negate fused multiply instructions
> negate the full result, not the multiply result. So we cannot use
> those instructions for the fnmadf4/fnmsdf4/fnmasf4/fnmssf4 patterns.
> Since rs6000 provides patterns for such negate operations (presumably
> just in case the c
On Wed, Sep 14, 2011 at 04:00:02AM -0400, David Miller wrote:
>
> Eric, this is a preliminary version of the FMA patch I've been
> working on. Just so you can see what I'm doing.
>
> First, ignore the fact that there are two configure tests for the
> presence of support for these instructions.
Eric, this is a preliminary version of the FMA patch I've been
working on. Just so you can see what I'm doing.
First, ignore the fact that there are two configure tests for the
presence of support for these instructions. I'm busy normalizing the
-xarch options which binutils supports so that th
