0 | 0000 0000 | 000 0000 0000 0000 0000 0000

+ | -127

SIGN:     
EXPONENT: (subtract 127 from unsigned binary value)
MANTISSA: (1 + fractional bits 1/2, 1/4, 1/8, 1/16... etc)
FLOAT:    

For 0 exponent is 00000000. For infinity exponent is 11111111.
AssemblyScript Source
WAT Source