Floating-point operations in VDSP (bf561) (4): Flt_max

A flt_max is a constant defined in float.h to represent the maximum value of a single-precision floating-point number.

#define FLT_MAX 3.4028234663852886e+38f

So where does this value come from?

From the representation of floating point can know, to take the maximum, you can set the index and the mantissa are the maximum value, because the Standard rules will be 1 to leave the index is a special expression, so the maximum index is 255, this number is

0 11111110 11111111111111111111111

Sign bit exponent mantissa

The value of the 16-based integer to see it is the 0x7f 7f FF ff.

According to the calculation formula of floating-point number, the value is:

1.9999997615814208984375 * 2 (254-127)

= 3.4028234663852886E+38

This is the calculation result of the calculator.