| From: | Duane McDonnell |
| Date: | 01 Apr 00 at 09:44:10 |
| Subject: | Re: endian code donations? |
>If you have an int, you can do it like this, although this looks real nasty
>and
>there must be an easier way to do it (its only three instructions in ASM):
>int endian;/* value you want to swap between formats */
>int swapped;/* value after swap */
>swapped = (((unsigned int)endian & 0xFF) << 24) |
> (((unsigned int)endian & 0xFF00) << 8) |
> (((unsigned int)endian & 0xFF0000) >> 8) |
> (((unsigned int)endian & 0xFF000000) >> 24);
I believe this is the optimal way to do this in portable C. If
portability isn't an issue you can inline/emit the ROL.W/SWAP/ROL.W
sequence. If you're a SAS/C user you can also use __builtin_rol
or __builtin_ror.
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