1 files changed, 8 insertions, 5 deletions
diff --git a/llvm/lib/Analysis/BasicAliasAnalysis.cpp b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
index 5395762477f..b52a1d7b24d 100644
--- a/llvm/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
@@ -1021,11 +1021,14 @@ static AliasResult aliasSameBasePointerGEPs(const GEPOperator *GEP1,
         // asking about values from different loop iterations. See PR32314.
         // TODO: We may be able to change the check so we only do this when
         // we definitely looked through a PHINode.
-        KnownBits Known1 = computeKnownBits(GEP1LastIdx, DL);
-        KnownBits Known2 = computeKnownBits(GEP2LastIdx, DL);
-        if (Known1.Zero.intersects(Known2.One) ||
-            Known1.One.intersects(Known2.Zero))
-          return NoAlias;
+        if (GEP1LastIdx != GEP2LastIdx &&
+            GEP1LastIdx->getType() == GEP2LastIdx->getType()) {
+          KnownBits Known1 = computeKnownBits(GEP1LastIdx, DL);
+          KnownBits Known2 = computeKnownBits(GEP2LastIdx, DL);
+          if (Known1.Zero.intersects(Known2.One) ||
+              Known1.One.intersects(Known2.Zero))
+            return NoAlias;
+        }
       } else if (isKnownNonEqual(GEP1LastIdx, GEP2LastIdx, DL))
         return NoAlias;
     }