Hi, I've got an idea for a MMX checker tool. First some background: When you use MMX/SSE instructions on the x86 platform you have to reset the FPU stack with the 'emms' instruction after calculations finished. Otherwise the following floating point instructions will fail.
I have a large C++ project here and somewhere in an static initializer such an reset is omitted. Spotting the missing place is quite hard. I've tried to use GDB to watch the $ftag register, but GDBs single instruction stepping takes ages. So the valgrind tool should do the following: If an FPU instruction is executed with a corrupt FPU stack, print the position of the last MMX/SSE instruction. I've skimmed the lackey source code, but have still no idea where to start. It would be nice if you could provide me some assistance or even some source code. What do you think? Thanks, Gregor ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Valgrind-developers mailing list Valgrind-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-developers
