Re: Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format

2020-08-15 Thread Thomas König
Am 10.08.20 um 18:53 schrieb Michael Meissner: IMHO, changing the default is only appropriate for times like a distribution major number changes, where backwards and forwards compatibility is carefully controlled. But before we can contemplate doing this, we need the ability to change the defaul

Re: Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format

2020-08-10 Thread Michael Meissner via Gcc
On Sat, Aug 08, 2020 at 03:33:51PM +0200, Thomas König wrote: > Hi Michael, > > I have shortened the distribution list somewhat for the Fortran-relevant > parts. > > >I want to discuss changes that I think we need to make across the open source > >toochain to allow us to change the long double ty

Re: Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format

2020-08-08 Thread Thomas König
Just another thought. In Fortran, we have the possibility to define KIND numbers for numeric types however we want. So, it would be no problem to have two long double types with distinct kind numbers, let's say KIND=16 for one type and KIND=17 for the other. We can then let selected_real_kind re

Re: Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format

2020-08-08 Thread H.J. Lu via Gcc
On Fri, Aug 7, 2020 at 1:57 PM Michael Meissner via Gcc wrote: > > I want to discuss changes that I think we need to make across the open source > toochain to allow us to change the long double type on PowerPC hardware from > using the IBM extended double (i.e. a pair of doubles) to the IEEE 128-b

Re: Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format

2020-08-08 Thread Thomas König
Hi Michael, I have shortened the distribution list somewhat for the Fortran-relevant parts. I want to discuss changes that I think we need to make across the open source toochain to allow us to change the long double type on PowerPC hardware from using the IBM extended double (i.e. a pair of do

Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format

2020-08-07 Thread Michael Meissner via Gcc
I want to discuss changes that I think we need to make across the open source toochain to allow us to change the long double type on PowerPC hardware from using the IBM extended double (i.e. a pair of doubles) to the IEEE 128-bit format defined in IEEE 754. I wasn't sure whom to address this to, s