Jakob Stoklund Olesen eb49566447 Run ProcessImplicitDefs on SSA form where it can be much simpler. ...

Implicitly defined virtual registers can simply have the <undef> bit set
on all uses, and copies can be turned into implicit defs recursively.

Physical registers are a bit trickier. We handle the common case where a
physreg def is used by a nearby instruction in the same basic block. For
more complicated cases, just leave the IMPLICIT_DEF instruction in.

llvm-svn: 159149

2012-06-25 18:12:18 +00:00

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