When frexp is used within a fabs function (as shown below) the value returned is negative.
double a = fabs(frexp(b, &i)); Example code and temp files are attached. This code works in gcc version 3.4 -- Summary: Using frexp with fabs produces negative result Product: gcc Version: 4.0.1 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: m dot broadbent at signal dot qinetiq dot com CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-gnu-linux GCC host triplet: i686-gnu-linux GCC target triplet: i686-gnu-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23195