Hi, I think we can fix this issue by following approach. I think a valid fix would be the following. We might want to add a call to _fpreset() in __dyn_tls_init() before the last for-loop (see tlssup.c in mingw-w64-crt/crt/
Kai 2016-03-02 16:51 GMT+01:00 Alberto Luaces <alua...@udc.es>: > "Burkhardt, Glenn" writes: > >> You're probably running into the fact that Intel processors have >> floating point registers with 80 bits, and when optimization is turned >> on, operations are done in registers and not truncated as they are >> when the values are stored to memory. >> >> See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 Notice the number of >> duplicated reports - it's a surprise to a lot of people. >> >> There are ways to set the precision used by the FPU, e.g., >> >> #include "fpu_control.h" >> >> fpu_control_t cw; >> _FPU_GETCW(cw); >> cw &= ~_FPU_EXTENDED; >> cw |= _FPU_DOUBLE; >> _FPU_SETCW(cw); > > Aren't those settings only useful int 32-bit code?[1] It could matter > depending if the OP's code is compiled in 64 or 32 bits. > > > Footnotes: > [1] > https://stackoverflow.com/questions/22710272/difference-in-floating-point-arithmetics-between-x86-and-x64 > > -- > Alberto > > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Mingw-w64-public mailing list > Mingw-w64-public@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mingw-w64-public ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
