"Michael Gong" <mwgong@xxxxxxxxxxxxxx> writes:
> I saw following function definition in libgcc2.c.
>
> ...
>
> DFtype
> __floatdidf (DItype u)
> {
> DFtype d = (SItype) (u >> (4 * 8));
> d *= 0x1p32f;
> d += (USItype)u;
> return d;
> }
>
> Can anyone tell me what's the constant "0x1p32f" ? Is it a decimal
> floating pointer constant ?
It is a single precision hexadecimal floating point constant. This is
a feature introduced into the language by the C99 standard. See ISO
C99 section 6.4.4.2.
The value of 0x1p32f is 2^32 == 4294967296.
Ian
