[M16C-ELF] : Problem with double and float data types.

["Ina Pandit" <InaP at KPITCummins dot com>]

Hi,

I have downloaded latest GCC and Binutils sources from FSF for M16C 
port. Using these sources, I could successfully build the cross 
toolchain i.e. m32c-elf-*.

I have observed the following behavior while using "float" and 
"double" data types for m16c target. Any computation involving 
a "float" or a "double" data type does not work on the m16c hardware. 
However, the correct values can be observed using GDB simulator. 

For example, the following code: 

#include<stdio.h>
int main(void)
{
   float f1 = 3.0;

   printf("\n f1 = %f \n",f1);

   f1 += 2.0;
   printf("\n f1 = %f \n",f1);

return 0;
}

prints the expected values of "f1" using gdb simulator. 
However, the above code does not work on hardware. 
Only the initial value of "f1",i.e. 3.0 is output on the serial port. 
But the value after computation i.e. 5.0 in not output. 
Similar behavior is observed when "double" data type is used. 

Please note that for outputting these characters on the serial port 
we have modified the printf() function a bit. 

Also the option "-msim" is used to print the output on the console 
using gdb simulator. But, even without this option ( with no printf() 
function in the code) the values can be watched by debugging the 
code using gdb.

Thanks in advance.

Regards,
Ina Pandit
KPIT Cummins InfoSystems Ltd.
Pune, India

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