Revert r121520, which may have introduced miscompilations.

[oota-llvm.git] / lib / Analysis / BasicAliasAnalysis.cpp

diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 17a502e1f78ba464e577ec12127797e523ff7734..3ab18fd3c0d24ee2d1ae17d1cc72c74ba78cc07b 100644 (file)
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -857,17 +857,6 @@ BasicAliasAnalysis::aliasGEP(const GEPOperator *GEP1, uint64_t V1Size,
   if (GEP1BaseOffset == 0 && GEP1VariableIndices.empty())
     return MustAlias;
 
-  // If there is a difference betwen the pointers, but the difference is
-  // less than the size of the associated memory object, then we know
-  // that the objects are partially overlapping.
-  if (GEP1BaseOffset != 0 && GEP1VariableIndices.empty()) {
-    if (GEP1BaseOffset >= 0 ?
-        (V2Size != UnknownSize && (uint64_t)GEP1BaseOffset < V2Size) :
-        (V1Size != UnknownSize && -(uint64_t)GEP1BaseOffset < V1Size &&
-         GEP1BaseOffset != INT64_MIN))
-      return PartialAlias;
-  }
-
   // If we have a known constant offset, see if this offset is larger than the
   // access size being queried.  If so, and if no variable indices can remove
   // pieces of this constant, then we know we have a no-alias.  For example,