[Bug c++/37276] Trouble with some (C99?) math builtins and namespace std

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-08-29 13:11 -------
Actually, it looks like we treat

namespace std
{
  inline double
  atanh(double __x)
  { return __builtin_atanh(__x); }
}

as a definition of ::atanh (with C linkage), and emit

atanh:
.LFB0:
        pushq   %rbp
.LCFI0:
        movq    %rsp, %rbp
.LCFI1:
        subq    $32, %rsp
.LCFI2:
        movsd   %xmm0, -8(%rbp)
        movsd   -8(%rbp), %xmm0
        call    atanh
        movsd   %xmm0, -24(%rbp)
        movq    -24(%rbp), %rax
        movq    %rax, -24(%rbp)
        movsd   -24(%rbp), %xmm0
        leave
        ret

main:
.LFB1:
        pushq   %rbp
.LCFI3:
        movq    %rsp, %rbp
.LCFI4:
        movsd   .LC0(%rip), %xmm0
        call    atanh
        movl    $0, %eax
        leave
        ret


So, this is a frontend bug.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu dot org
         AssignedTo|rguenth at gcc dot gnu dot  |unassigned at gcc dot gnu
                   |org                         |dot org
             Status|ASSIGNED                    |NEW
           Keywords|                            |wrong-code


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37276