On 08/21/2015 04:08 AM, H. Peter Anvin wrote: > Wrong fix, though. Instead we should change it to use the set instruction, > which would also make it easier to use the CC_SET/CC_OUT proposed macros to > use assembly out in the future. > > The downside with set is that it only sets a single byte, the upside is that > it always outputs 0 or 1, and apparently if the output variable is your bool > gcc can use that for optimization. >
hpa, I didn't realize your comment was suggesting a change. I've done a google search on "gcc bool optimization" (and various incantations of that) and didn't find anything that lead me in the direction of making a change. Could you elaborate on what the issue is? Thanks, P. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
