Hi!
On Fri, Apr 07, 2023 at 02:32:04AM -0400, Michael Meissner wrote:
> On Thu, Apr 06, 2023 at 03:37:59PM -0500, Segher Boessenkool wrote:
> > > This patch eliminates the generation of the Altivec fmaddfp and fnmsubfp
> > > instructions as alternatives in the VSX instruction insn support, and in
On Thu, Apr 06, 2023 at 03:37:59PM -0500, Segher Boessenkool wrote:
> Hi!
>
> On Thu, Apr 06, 2023 at 11:12:11AM -0400, Michael Meissner wrote:
> > The Altivec instructions fmaddfp and fnmsubfp have different rounding
> > behaviors
>
> Those are not existing instructions. You mean "vmaddfp"
Hi!
On Thu, Apr 06, 2023 at 11:12:11AM -0400, Michael Meissner wrote:
> The Altivec instructions fmaddfp and fnmsubfp have different rounding
> behaviors
Those are not existing instructions. You mean "vmaddfp" etc.
> than the VSX xvmaddsp and xvnmsubsp instructions. In particular, generating
The Altivec instructions fmaddfp and fnmsubfp have different rounding behaviors
than the VSX xvmaddsp and xvnmsubsp instructions. In particular, generating
these instructions seems to break Eigen.
GCC has generated the Altivec fmaddfp and fnmsubfp instructions on VSX systems
as an alternative to
