I did a little digging, and it looks like gcc-4.4 will emit
__bswapdi2
calls. Support in rs6000.md appeared 2009-06-25.
That's where it was seen. I don't have anything that ancient any
more so
it didn't show up in my testing, but Al saw it on a Debian system.
It should never happen on 32-bit -- it is broken into two bswapsi's --
although, old compiler, who knows. Lack of testing makes some people
nervous though ;-)
Segher
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