Review request (XS): 6684385 Loop unswitching crashes without LoopNode

Chuck Rasbold Chuck.Rasbold at Sun.COM
Tue Apr 8 13:39:13 PDT 2008

Fixed 6684385: Loop unswitching crashes without LoopNode

Due to the sometimes unpredictable handling of irreducible loops, a
non-irreducible loop was found on the second call to
build_loop_tree(), and therefore was not beautified.

Without a LoopNode at the head of the loop, policy_unswitching()

Fix policy_unswitching() to return false for any loop which does not
have a LoopNode for a head. Do the same for partial_peel().

Reviewed by:
Fix verified (y/n): y

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