http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47493
Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |burnus at gcc dot gnu.org
--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-01-27
17:04:51 UTC ---
> (.rodata+0x68): undefined reference to `_gfortran_specific__sqrt_r8'
Can you run:
nm libgfortran.a |grep _gfortran_specific__sqrt_
on my system that gives:
0000000000000000 T _gfortran_specific__sqrt_r4
0000000000000000 T _gfortran_specific__sqrt_r8
0000000000000000 T _gfortran_specific__sqrt_r10
0000000000000000 T _gfortran_specific__sqrt_r16
0000000000000000 T _gfortran_specific__sqrt_c4
0000000000000000 T _gfortran_specific__sqrt_c8
0000000000000000 T _gfortran_specific__sqrt_c10
0000000000000000 T _gfortran_specific__sqrt_c16
and I somehow expect that also HPPA has a double-precision sqrt ...
* * *
The other question is: Why is that wrapper called and not directly
__builtin_sqrt? In C that also works:
#include <stdio.h>
#include <math.h>
static void
myproc(double(*f)(double), double x)
{
printf("%e: %e %e\n", x, f(x),sqrt(x));
}
main()
{
myproc(__builtin_sqrt, 4.0);
return 0;
}
Result:
printf (&"%e: %e %e\n"[0], 4.0e+0, 2.0e+0, 2.0e+0);
return 0;
While the Fortran equivalent produces:
myproc (_gfortran_specific__sqrt_r8, &C.1537);
and
D.1545_3 = f_2(D) (x_1(D));
D.1547_5 = __builtin_sqrt (D.1546_4);
for
program main
intrinsic dsqrt
call myproc(dsqrt, 4.0d0)
contains
subroutine myproc(f, x)
procedure(dsqrt) f
real(8), value :: x
print *, x, f(x), dsqrt(x)
end subroutine myproc
end program main
The big other question is: why is "myproc" is not inlined? (For -O3
(-fwhole-program, (-flto)).)
