Andrew Trick 2b6860f0a1 Allow loop unrolling to get known trip counts from ScalarEvolution. ...

SCEV unrolling can unroll loops with arbitrary induction variables. It
is a prerequisite for -disable-iv-rewrite performance. It is also
easily handles loops of arbitrary structure including multiple exits
and is generally more robust.

This is under a temporary option to avoid affecting default
behavior for the next couple of weeks. It is needed so that I can
checkin unit tests for updateUnloop.

llvm-svn: 137384

2011-08-11 23:36:16 +00:00

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