Date: Sun, 19 Apr 2015 15:40:20 +0100 From: Justin Cormack <justin@...cialbusservice.com> To: musl@...ts.openwall.com Subject: Re: ppc64 ABI On 19 April 2015 at 14:54, Szabolcs Nagy <nsz@...t70.net> wrote: > * Justin Cormack <justin@...cialbusservice.com> [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. Justin
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