[llvm] r276364 - GVN-hoist: add missing check for all GEP operands available

[Sebastian Pop via llvm-commits]

Author: spop
Date: Thu Jul 21 18:32:39 2016
New Revision: 276364

URL: http://llvm.org/viewvc/llvm-project?rev=276364&view=rev
Log:
GVN-hoist: add missing check for all GEP operands available

Modified:
    llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp?rev=276364&r1=276363&r2=276364&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp Thu Jul 21 18:32:39 2016
@@ -613,6 +613,9 @@ public:
 
     // Also copy Val when it is a GEP.
     if (Val && isa<GetElementPtrInst>(Val)) {
+      // Check whether we can compute the GEP at HoistPt.
+      if (!allOperandsAvailable(Val, HoistPt))
+        return false;
       Instruction *ClonedVal = Val->clone();
       ClonedVal->insertBefore(HoistPt->getTerminator());
       // Conservatively discard any optimization hints, they may differ on the