On Tuesday 03 July 2007 11:23, Chris Lattner wrote:
> >> + // fold (or x, undef) -> -1
> >> + if (N1.getOpcode() == ISD::UNDEF)
> >> + return DAG.getConstant(-1, VT);
> >
> > Is this the right way to get an all-bits-one value?
>
> Yes, but this has the same problem with vectors. :)
I don't understand the comment about vectors, but I would have expected
"all ones" to be spelled "~0ull." Of course, the suffix used might depend on
the host architecture, which makes things tricky. But not every host may be
two's-complement, either. :)
-Dave
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