Revert r141870. The test case crashes on linux with data corruption. A deeper issue was exposed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141873 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 14 deletions

diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp
index e76b6b10cf..81f4db1c7d 100644
--- a/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -1120,14 +1120,6 @@ Value *SCEVExpander::expandAddRecExprLiterally(const SCEVAddRecExpr *S) {
     BasicBlock *LatchBlock = L->getLoopLatch();
     assert(LatchBlock && "PostInc mode requires a unique loop latch!");
     Result = PN->getIncomingValueForBlock(LatchBlock);
-
-    // For an expansion to use the postinc form, the client must call
-    // expandCodeFor with an InsertPoint that is either outside the PostIncLoop
-    // or dominated by IVIncInsertPos.
-    assert((!isa<Instruction>(Result) ||
-            SE.DT->dominates(cast<Instruction>(Result),
-                             Builder.GetInsertPoint())) &&
-           "postinc expansion does not dominate use");
   }
 
   // Re-apply any non-loop-dominating scale.
@@ -1418,12 +1410,8 @@ Value *SCEVExpander::expand(const SCEV *S) {
   Value *V = visit(S);
 
   // Remember the expanded value for this SCEV at this location.
-  //
-  // This is independent of PostIncLoops. The mapped value simply materializes
-  // the expression at this insertion point. If the mapped value happened to be
-  // a postinc expansion, it could be reused by a non postinc user, but only if
-  // its insertion point was already at the head of the loop.
-  InsertedExpressions[std::make_pair(S, InsertPt)] = V;
+  if (PostIncLoops.empty())
+    InsertedExpressions[std::make_pair(S, InsertPt)] = V;
 
   restoreInsertPoint(SaveInsertBB, SaveInsertPt);
   return V;