Re: [PATCH] abuse of macros in swab.h

From: Giuliano Pochini (pochini@denise.shiny.it)
Date: Thu Sep 21 2000 - 20:50:46 EST

> +static inline __u64 ___swab16(__u64 x)
> +{
> + return (__u64)((x & (__u64)0x00000000000000ffULL) << 56) |
> + (__u64)((x & (__u64)0x000000000000ff00ULL) << 40) |
> + (__u64)((x & (__u64)0x0000000000ff0000ULL) << 24) |
> + (__u64)((x & (__u64)0x00000000ff000000ULL) << 8) |
> + (__u64)((x & (__u64)0x000000ff00000000ULL) >> 8) |
> + (__u64)((x & (__u64)0x0000ff0000000000ULL) >> 24) |
> + (__u64)((x & (__u64)0x00ff000000000000ULL) >> 40) |
> + (__u64)((x & (__u64)0xff00000000000000ULL) >> 56);
> +}

And something like this ?

static inline __u64 ___swab16(__u64 x){
__u64 n;
  n = (x>>32) | (x<<32);
  n = ((n & 0x0000ffff0000ffffLL)<<16) | (n & 0xffff0000ffff0000LL)>>16;
  n = ((n & 0x00ff00ff00ff00ffLL)<<8) | (n & 0xff00ff00ff00ff00LL)>>8;
  return(n);
}

Bye.

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