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Revert "Fix PR18361: Invalidate LoopDispositions after LoopSimplify hoists things."

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This commit was the source of crasher PR18384:

While deleting: label %for.cond127
An asserting value handle still pointed to this value!
UNREACHABLE executed at llvm/lib/IR/Value.cpp:671!

Reverting to get the builders green, feel free to re-land after fixing up.
(Renato has a handy isolated repro if you need it.)

This reverts commit r198478.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198503 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alp Toker
2014-01-04 17:00:45 +00:00
parent 72d2b05254
commit ccd36c4c54
3 changed files with 10 additions and 104 deletions
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7
include/llvm/Analysis/ScalarEvolution.h
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@ -784,13 +784,6 @@ namespace llvm {
/// disconnect it from a def-use chain linking it to a loop.
void forgetValue(Value *V);
/// \brief Called when the client has changed the disposition of values in
/// this loop.
///
/// We don't have a way to invalidate per-loop dispositions. Clear and
/// recompute is simpler.
void forgetLoopDispositions(const Loop *L) { LoopDispositions.clear(); }
/// GetMinTrailingZeros - Determine the minimum number of zero bits that S
/// is guaranteed to end in (at every loop iteration). It is, at the same
/// time, the minimum number of times S is divisible by 2. For example,