[llvm-commits] [llvm] r76222 - /llvm/trunk/lib/VMCore/Instructions.cpp

[Dan Gohman]

Author: djg
Date: Fri Jul 17 14:23:21 2009
New Revision: 76222

URL: http://llvm.org/viewvc/llvm-project?rev=76222&view=rev
Log:
GetElementPtr instructions default to having no overflow.

Modified:
    llvm/trunk/lib/VMCore/Instructions.cpp

Modified: llvm/trunk/lib/VMCore/Instructions.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/Instructions.cpp?rev=76222&r1=76221&r2=76222&view=diff

==============================================================================
--- llvm/trunk/lib/VMCore/Instructions.cpp (original)
+++ llvm/trunk/lib/VMCore/Instructions.cpp Fri Jul 17 14:23:21 2009
@@ -1022,6 +1022,9 @@
     OL[i+1] = Idx[i];
 
   setName(Name);
+
+  // GetElementPtr instructions have undefined results on overflow by default.
+  setHasNoPointerOverflow(true);
 }
 
 void GetElementPtrInst::init(Value *Ptr, Value *Idx, const std::string &Name) {
@@ -1031,6 +1034,9 @@
   OL[1] = Idx;
 
   setName(Name);
+
+  // GetElementPtr instructions have undefined results on overflow by default.
+  setHasNoPointerOverflow(true);
 }
 
 GetElementPtrInst::GetElementPtrInst(const GetElementPtrInst &GEPI)
@@ -1042,6 +1048,9 @@
   Use *GEPIOL = GEPI.OperandList;
   for (unsigned i = 0, E = NumOperands; i != E; ++i)
     OL[i] = GEPIOL[i];
+
+  // Transfor the hasNoPointerOverflow() value from the original GEPI.
+  setHasNoPointerOverflow(GEPI.hasNoPointerOverflow());
 }
 
 GetElementPtrInst::GetElementPtrInst(Value *Ptr, Value *Idx,