Eli Friedman acf8006471 [Polly CodeGen] Break critical edge from RTC to original loop.
This makes polly generate a CFG which is closer to what we want
in LLVM IR, with a loop preheader for the original loop. This is
just a cleanup, but it exposes some fragile assumptions.

I'm not completely happy with the changes related to expandCodeFor;
RTCBB->getTerminator() is basically a random insertion point which
happens to work due to the way we generate runtime checks. I'm not
sure what the right answer looks like, though.

Differential Revision: https://reviews.llvm.org/D26053

llvm-svn: 285864
2016-11-02 22:32:23 +00:00
2016-11-02 19:51:41 +00:00
2016-11-02 21:39:02 +00:00
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