2007.07.29 19:40 "Re: [Tiff] TIFFShiftArrayOfLong", by Toby Thain
On 28-Jul-07, at 4:15 PM, Oliver Geisen wrote:
> Shifting more than 7 bits *does* makes sense; shifting an array by > 24 bits is the same as shifting the array by three bytes. It is
>> not the same as not shifting at all.
Shifting by 24 bits is equal to move three bytes and for moving you don't need bit-manipulation (which is slow by design).
Depending on architecture, shifting a long by 8 bits may well be faster than four byte load/stores.
For me, bit-shifting applies to smaller than 8 bit data only, because everything else could be made with byte (or more) moves.
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