Dan Gohman b6b8ec769c Restore LoopUnswitch's block-oriented threshold. LoopUnswitch now checks both ...

the estimated code size and the number of blocks when deciding whether to
do a non-trivial unswitch. This protects it from some very undesirable
worst-case behavior on large numbers of loop-unswitchable conditions, such
as in the testcase in PR5259.

llvm-svn: 84661

2009-10-20 20:06:09 +00:00

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