http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49949
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> 2011-09-28 15:54:09 UTC --- (In reply to comment #0) > With the -O2 flag and in a very specialized circumstance, the product of a > complex<double> and a double has the wrong sign. > > The problem arises when the blitz++ array library is used. > (http://www.oonumerics.org/blitz/) Unfortunately, I could not prune out all > the > references to the unnecessary C++ standard libraries. The size of the .ii file > is therefore pretty big. I hope the report will still be useful. > > The output of the executable gcc_complex_bug should be > > (-0.0,-1.0)x100.0=(0.0,100.0) > I also got (-0.0,-1.0)x100.0=(-0.0,-100.0) with GCC 4.7.0 revision 179164. Why should we get (0.0,100.0)?
