Author: Dann Corbit
Date: 20:45:39 06/06/02
Go up one level in this thread
On June 06, 2002 at 23:45:01, Dann Corbit wrote:
Err...
Make that news:comp.programming (and also news:sci.math in the crosspost)
>uint64 flip(uint64 a)
>{
> a = (a&0xf0f0f0f00f0f0f0f)
> |(a&0x0f0f0f0f00000000)>>28
> |(a&0x00000000f0f0f0f0)<<28;
> a = (a&0xcccc3333cccc3333)
> |(a&0x3333000033330000)>>14
> |(a&0x0000cccc0000cccc)<<14;
> return (a&0xaa55aa55aa55aa55)
> |(a&0x5500550055005500)>>7
> |(a&0x00aa00aa00aa00aa)<<7;
>}
>
>uint64 rotate90(uint64 a)
> a = (a&0xf0f0f0f000000000)>>32
> |(a&0x0f0f0f0f00000000)<<4
> |(a&0x00000000f0f0f0f0)>>4
> |(a&0x000000000f0f0f0f)<<32;
> a = (a&0xcccc0000cccc0000)>>16
> |(a&0x3333000033330000)<<2
> |(a&0x0000cccc0000cccc)>>2
> |(a&0x0000333300003333)<<16;
> a = (a&0xaa00aa00aa00aa00)>>8
> |(a&0x5500550055005500)<<1
> |(a&0x00aa00aa00aa00aa)<<8
> |(a&0x0055005500550055)>>1;
> return a;
>}
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