On Wed, Jan 28, 2004 at 11:53:12AM -0800, Jun Sun wrote: > On Wed, Jan 28, 2004 at 02:33:55PM -0500, Daniel Jacobowitz wrote: > > On Wed, Jan 28, 2004 at 11:26:36AM -0800, Rajesh Palani wrote: > > > Hi, > > > > > > We are using a gcc 2.96 20000731 (Red Hat Linux 7.1 2.96-99.1) GCC cross-compiler with -msoftfloat to use software floating point routines. > > > > > > When we profied an application using the Linux Trace Toolkit, we observed that there were a lot of CpU (Co-processor unusable) exceptions. Some of the floating point routines ( eg. __floatdidf) expect values to be passed in floating point registers and take FP exceptions even though the application has been built with -msoftfloat. Is this a general MIPS/GCC issue? What is the status of softfloat for MIPS in GCC? > > > > Try a more recent compiler, that one is ancient. If you configure > > correctly, you should get no references to the floating point registers > > at all. > > > > If glibc is not compiled with -msoftfloat, I think you will get a few > FPU exceptions from glibc no matter how apps are compiled. > > Actually, will it be a problem if glibc and apps are compiled differently > (such as in longjump, sig handling area)? Yes, that will be a problem. Nothing that takes or returns a floating point value will work either. -- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer
