https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66887
Bug ID: 66887 Summary: trunk/libmpx/mpxrt/mpxrt.c:158: possible performance problem Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: other Assignee: unassigned at gcc dot gnu.org Reporter: dcb314 at hotmail dot com Target Milestone: --- [trunk/libmpx/mpxrt/mpxrt.c:159]: (performance) Buffer 'buffer' is being written before its old content has been used. Source code is memset (buffer, 0, sizeof (buffer)); memcpy (buffer, (uint8_t *)uctxt->uc_mcontext.fpregs + XSAVE_OFFSET_IN_FPMEM, sizeof (struct xsave_struct)); Maybe something like memcpy (buffer, (uint8_t *)uctxt->uc_mcontext.fpregs + XSAVE_OFFSET_IN_FPMEM, sizeof (struct xsave_struct)); memset (&buffer[sizeof (struct xsave_struct))], 0, sizeof (buffer) - sizeof (struct xsave_struct)) );