> +static inline u32 from64to32(u64 x)
> +{
> + /* add up 32-bit and 32-bit for 32+c bit */
> + x = (x & 0xffffffff) + (x >> 32);
> + /* add up carry.. */
> + x = (x & 0xffffffff) + (x >> 32);
> + return (u32)x;
> +}
As a matter of interest, does the compiler optimise away the
second (x & 0xffffffff) ?
The code could just be:
x = (x & 0xffffffff) + (x >> 32);
return x + (x >> 32);
David
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