http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56085
Bug #: 56085
Summary: Unsafe negation in C++03 pow(complex,int)
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: gli...@gcc.gnu.org
template<typename _Tp>
inline complex<_Tp>
pow(const complex<_Tp>& __z, int __n)
{
return __n < 0
? complex<_Tp>(1) / std::__complex_pow_unsigned(__z, -__n)
: std::__complex_pow_unsigned(__z, __n);
If I understand correctly, -__n is undefined behavior for INT_MIN, and this
should use -(unsigned)__n instead to be safe. This is not just theoretical,
other projects had to do similar changes because gcc starting with 4.7 would
produce wrong code otherwise.
