On Tue, May 31, 2005 at 09:53:05PM +0200, Vincent Lefevre wrote:
> On 2005-05-31 11:39:39 -0700, Mike Stump wrote:
> > On May 31, 2005, at 10:25 AM, Vincent Lefevre wrote:
> > >Well, there is no extended precision with GCC under Linux/PPC.
> >
> > Hum, I do wonder about even that; why do:
> >
> > 2004-02-07 Alan Modra <[EMAIL PROTECTED]>
> >
> > * config/rs6000/t-linux64 (LIB2FUNCS_EXTRA): Add darwin-
> > ldouble.c.
> >
> > powerpc64-*-linux*)
>
> Hmm... this is powerpc64.
Yes. powerpc64-linux uses IBM extended precision long doubles.
> Under the 32-bit version, there's no extended precision.
No. powerpc-linux has 128-bit IEEE soft-float long double.
$ cat > fadd.c <<\EOF
long double fadd (long double a, long double b) { return a + b; }
EOF
$ gcc -m32 -mlong-double-128 -c fadd.c
$ nm fadd.o
00000000 T fadd
U _q_add
Now all you need is a library that supplies _q_add and similar. Let's
see, glibc is a likely place..
./sysdeps/powerpc/soft-fp/Makefile:powerpc-quad-routines := q_add q_cmp q_cmpe
q_div q_dtoq q_feq q_fge \
./sysdeps/powerpc/soft-fp/Versions: _q_add; _q_cmp; _q_cmpe; _q_div;
_q_dtoq; _q_feq; _q_fge; _q_fgt;
./sysdeps/powerpc/soft-fp/q_add.c:long double _q_add(const long double a, const
long double b)
Then of course, you need to convince glibc to build them for you.
--
Alan Modra
IBM OzLabs - Linux Technology Centre
