Re: math.h functions returning incorrect results

Hi,
 
Thanks for your reply. So do you think using -msoft-float might solve the problem. I do not have the device with me now, but will try it tomorrow.
 
Thanks,
Damjee

----- Original Message -----
From: Henry von Tresckow <[email protected]>
Date: Wednesday, November 22, 2006 23:44
Subject: Re: [Openzaurus-devel] math.h functions returning incorrect results
To: [email protected], [email protected]

> I think you might be running into soft vs hard float problems. 
> OpenZaurus 3.5.4 and above use softfloat and gcc 3.4. This is 
> the same 
> reason older sharp rom programs won't work on OZ.
> [email protected] wrote:
> > Hi All,
> >
> > I am using a Zaurus SL-5500 running OpenZaurus 3.5.4 ( 
> > 2.4.18-rmk7-pxa3-embedix) with  Opie 1.2.1.
> >
> > libm version =  libm-2.3.90.so
> >                          libm.so.6 -> libm-2.3.90.so
> >
> >
> > I am trying to compile and run the following code which uses 
> the 'cos' 
> > function in math.h.
> >
> > include <stdio.h>
> > #include <math.h>
> > #define pi 3.14159265358979
> >
> > int main(int argc, char **argv)
> > {
> >     double valtester,val11;
> >     valtester = 51.298351 * pi / 
> 180;   //converting degrees to radians
> >     
> printf("*[%f]\n",valtester);       
> >     printf("**[%f]\n",cos(valtester));
> > }
> >
> > ------------------------------------
> >
> > *Please note that the value 51.298351 above is not 
> significant, it is 
> > just an example.
> >
> > I am using the gcc cross compiler (gcc version 2.95.2 19991024 
> > (release)) to build the code with the following command.
> >
> > $ gcc -o test test.c -lm
> >
> > The code compiles and builds without any problem. However when 
> I run 
> > it on the Zaurus, the 'cos' funcitons returns incorrect values 
> (0.0000 
> > in the above case). The return values do not seem to be random 
> either, 
> > and it is not 0.0000 always either, but it is always 
> incorrect. For 
> > example the restuls are always wrong compared to the values I 
> get when 
> > I compile and run the same code on my linux desktop. Also what 
> is very 
> > interesting is that I tried the ARM cross combiled code on an 
> IPAQ 
> > h2200 running Familiar, which returned me the correct results.
> >
> > Any ideas how to get this working on the Zaurus, or what is 
> causing 
> > the problem.
> >
> > Thanks,
> > Damjee
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>

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