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Weird result of floating point calculations on MPC8548E

Question asked by li xiong on Nov 8, 2012
Latest reply on Nov 8, 2012 by li xiong


I have encountered a error when doing floating calculations, using Sourcery cross toolchain 4.5.2, and the GCC argument is "-c -fmessage-length=0 -std=c99 -msoft-float" The example is like following:



#include <stdio.h>

#include <float.h>

int main(){

    double a = 5;

    double b = a / ((double)2);

    double c = 5 / ((double)2);

    printf ("b = %2.6lf\n", b);

    printf ("c = %2.6lf\n", c);

    return 0;


     running result:

     b = 0.000000

     c = 2.500000


I couldn't figure out why floating variable is not working, and this code seems to me is quite OK. So I guess that the fault should lies in somewhere of GCC configuration, but no sure.