On Jul 27, 2006, at 11:15 AM, Jeremy Sagan wrote:
Does anyone have any example code for endian byte swapping an
aligned array of SInt16's using SSE on intel Macs?
I think is should be the equivalent of a sequence of loads,
permutes, and stores but I am not sure where to find the C
interface documentation for SSE and I am very interested to see
sample code like this.
Unless your array is huge, you'll usually get reasonable
performance from a simple for loop:
#include <libkern/OSByteOrder.h>
for(int i = 0; i < length; i++) {
array[i] = OSSwapInt16(array[i]);
}
That's the main reason why we haven't added bulk byte swappers to
the system yet. We've found that byte swapping rarely shows up as
a performance bottleneck for us.
If it is a performance bottleneck for you, you might want to ask
about this on the perfoptimization-dev mailing list.
-Eric
