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Date: Sun, 19 Apr 2015 15:40:20 +0100
From: Justin Cormack <>
Subject: Re: ppc64 ABI

On 19 April 2015 at 14:54, Szabolcs Nagy <> wrote:
> * Justin Cormack <> [2015-04-19 12:44:15 +0100]:
>> I am looking at doing a ppc64 port, and after some discussion on irc
>> last night wondering which ABI to port to.
>> ppc64 has two ABIs:
>> v1: as documented here
>> v2, usually known as powerpc64le, helpfully. It is not little endian
> ...
>> Both have 16 byte long double oddness.
> printf/scanf decimal conversion and libm are broken with ibm128
> if the toolchain could be configured to use ieee128 then that works
> (i see -mabi=ieeelongdouble compiler option in gcc, it seems 32bit
> powerpc sysv abi used to require ieee128 long double, but that was
> not implemented for aix and darwin so i'm not sure who uses it)
> 64bit long double works too and that's what musl uses on 32bit powerpc
> (i dont know how much code breaks if we change long double:
> i think on typical desktop/server it does not matter, but if you
> want to run some ppc optimized fortran code then it might..)

The Fedora ppc64 gcc accepts -mlong-double-64 it turns out.


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