extern double sqrt (double __x) throw ();
namespace ns
{
using ::sqrt;
template<typename _Tp>
class C
{
public:
C(const _Tp& = _Tp(), const _Tp & = _Tp());
const _Tp& r() const;
const _Tp& i() const;
private:
_Tp _M_r;
_Tp _M_i;
};
template<typename _Tp> inline const _Tp& C<_Tp>::r() const { return _M_r; }
template<typename _Tp> inline const _Tp& C<_Tp>::i() const { return _M_i; }
template<typename _Tp> inline C<_Tp>::C(const _Tp& __r, const _Tp& __i)
: _M_r(__r), _M_i(__i) { }
template<typename _Tp> _Tp foo(const C<_Tp>&);
template<typename _Tp> _Tp bar(const C<_Tp>&);
template<typename _Tp> inline _Tp bar(const C<_Tp>& __z)
{
_Tp __x = __z.r();
_Tp __y = __z.i();
const _Tp __s = __builtin_fabs(__x);
__x /= __s; __y /= __s;
return __s * sqrt(__x * __x + __y * __y);
}
template<typename _Tp> _Tp foo(const C<_Tp>& __z)
{
_Tp __x = __z.r();
_Tp __t = sqrt(ns::bar(__z));
return __t;
}
}
ns::C<double> z1(1.0/0.0, 0.0);
double z2;
int main()
{
z2 = ns::foo(z1);
return 0;
}
at -O1, -O2 or -O3 is compiled into an endless loop.
The bug seems to be that expand_errno_check expands arguments once again and
they
haven't been save_expr'ed.
--
Summary: Invalid code generated by expand_errno_check
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jakub at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: x86_64-redhat-linux, i386-redhat-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18951
