Jakob Stoklund Olesen 70ed924e18 Teach PHIElimination to handle <undef> operands. ...

When a PHI use is <undef>, don't emit a copy in the predecessor block,
but insert an IMPLICIT_DEF instruction instead. This ensures that
virtual register uses are always jointly dominated by defs, even if some
of them are IMPLICIT_DEF.

llvm-svn: 159121

2012-06-25 03:36:12 +00:00

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