Re: [PATCH], PowerPC long double transistion, patch #2

[Segher Boessenkool <segher at kernel dot crashing dot org>]

On Mon, Jun 18, 2018 at 03:06:18PM -0400, Michael Meissner wrote:
> On Fri, Jun 15, 2018 at 04:00:42PM -0500, Segher Boessenkool wrote:
> > But those aren't types, those are modes.  Why would the modes not work?
> > That makes no sense.  Just like the __ieee128 and __ibm128 types work
> > always, so should the IF, KF, IC and KC modes.
> > 
> > So what happens if you try to use KC?
> 
> The problem is the infrastructure of the compiler.  The type and builtin system
> really, really does not like having the same external name for a library
> function.  So if you have a type that uses KFmode and the function resolved to
> "__addkf3", and you have another type that uses TFmode, and it too resolves to
> "__addkf3" you get an internal error.  Ditto for the name mangling.
> 
> So we have to make sure that there are really only two modes being used.

Or just #define TFmode to KFmode (if that is the type being used), and
something similar for the types.  Similar to how Pmode works.

This might not be a simple change, but we'll need to get there eventually.
The way TFmode works currently is no end of problems.


Segher