[Pixman] Use of bitwise operators on vectors with Boolean results

Michael Tautschnig mt at debian.org
Fri Jun 27 01:48:20 PDT 2014

> > as, at least on the platforms that I tried, comparisons on vectors yield
> > (unsigned)-1 as representation of "true."
> Yes, this behaves exactly as documented at:
>     https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html
> "Vectors are compared element-wise producing 0 when comparison is false
> and -1 (constant of the appropriate type where all bits are set)
> otherwise."

Thank you very much for the elaboration!

Sorry for the noise,

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