commit 9029cb836304cd2848f589dc79373d9b67eb48e0
author Chris Lattner <sabre@nondot.org> Fri Jan 16 20:17:02 2009 +0000
committer Chris Lattner <sabre@nondot.org> Fri Jan 16 20:17:02 2009 +0000
tree 9b1e0090347be15cc065ed79c83cfb23534f3787
parent 71759c491c275ed37b6f97f04badf12ba9b3798c

don't assert and die on out of range (undefined) shifts.  This fixes
PR3334.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62352 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/Interpreter/Execution.cpp

diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
index 872a40b..f103609 100644
--- a/lib/ExecutionEngine/Interpreter/Execution.cpp
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -927,7 +927,11 @@
   GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
   GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
   GenericValue Dest;
-  Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
+  if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
+    Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
+  else
+    Dest.IntVal = Src1.IntVal;
+  
   SetValue(&I, Dest, SF);
 }
 
@@ -936,7 +940,11 @@
   GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
   GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
   GenericValue Dest;
-  Dest.IntVal =  Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
+  if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
+    Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
+  else
+    Dest.IntVal = Src1.IntVal;
+  
   SetValue(&I, Dest, SF);
 }
 
@@ -944,8 +952,12 @@
   ExecutionContext &SF = ECStack.back();
   GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
   GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
-  GenericValue Dest; 
-  Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
+  GenericValue Dest;
+  if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
+    Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
+  else
+    Dest.IntVal = Src1.IntVal;
+  
   SetValue(&I, Dest, SF);
 }