Jakob Stoklund Olesen 4d19d2651d Don't add <imp-def> operands during register rewriting. ...

LiveIntervals already adds <imp-def> operands for super-registers when a subreg
def defines the whole register. Thus, it is not necessary to do it again when
rewriting.

In fact, the super-register imp-defs caused miscompilations because the late
scheduler couldn't see that the super-register was read.

We still add super-reg <imp-use,kill> operands when rewriting virtuals to
physicals.

llvm-svn: 113299

2010-09-07 22:38:45 +00:00

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