__isinf, __isnan and __isnormal on C2000 CLA FPU

Hi,

The CLA treats NaN as +inf, and denorm numbers as 0. There is no standard C math library for the CLA so we dont support the functions isin, isnan, isnormal.

You will have to compare the hex representation of the number against +- inf to test for infinity.I would do it as follows

#define IEEE754_SIGN_M   (1UL << 31)
#define IEEE754_EXP_M    (0xFFUL)
#define IEEE754_EXP_S    (23U)
#define IEEE754_MANT_M   (0x7FFFFFUL)

typedef _float32_t_
{
    float    f32;
    uint32_t ui32;
    int32_t  i32;
}float32_t;

float32_t a = <some floating point operation>

// Check for infinity
if(((a.ui32 >> IEEE754_EXP_S) & IEEE754_EXP_M) == 255UL)
{
    // Exponent is 255, a is +- Inf
}
else if (((a.ui32 >> IEEE754_EXP_S) & IEEE754_EXP_M) == 0UL)
{

    // Subnorm (denorm) or zero
    
}
else
{
    // normal range
}