Matt Pharr 9920b30318 Fix bug that led to incorrect code with return statements. ...

The conceptual error was the assumption that not being under varying
control flow implied that the mask was all on; this is not the case
if some of the instances have executed a return earlier in the function's
execution.  The error in practice would be that the mask would be
assumed to be all-on for things like memory writes, so there would
be unintended side-effects for the instances that had returned.

2011-12-15 06:00:31 -08:00

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