[llvm-commits] [llvm] r43076 - in /llvm/trunk: include/llvm/Constants.h lib/VMCore/Constants.cpp

[Dan Gohman]

Author: djg
Date: Wed Oct 17 12:51:30 2007
New Revision: 43076

URL: http://llvm.org/viewvc/llvm-project?rev=43076&view=rev
Log:
Define a helper function ConstantVector::getSplatValue for testing for
and working with broadcasted constants.

Modified:
    llvm/trunk/include/llvm/Constants.h
    llvm/trunk/lib/VMCore/Constants.cpp

Modified: llvm/trunk/include/llvm/Constants.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Constants.h?rev=43076&r1=43075&r2=43076&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Constants.h (original)
+++ llvm/trunk/include/llvm/Constants.h Wed Oct 17 12:51:30 2007
@@ -438,6 +438,10 @@
   /// @brief Determine if the value is all ones.
   bool isAllOnesValue() const;
 
+  /// getSplatValue - If this is a splat constant, meaning that all of the
+  /// elements have the same value, return that value. Otherwise return NULL.
+  Constant *getSplatValue();
+
   virtual void destroyConstant();
   virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
 

Modified: llvm/trunk/lib/VMCore/Constants.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/Constants.cpp?rev=43076&r1=43075&r2=43076&view=diff

==============================================================================
--- llvm/trunk/lib/VMCore/Constants.cpp (original)
+++ llvm/trunk/lib/VMCore/Constants.cpp Wed Oct 17 12:51:30 2007
@@ -1286,6 +1286,17 @@
   return true;
 }
 
+/// getSplatValue - If this is a splat constant, where all of the
+/// elements have the same value, return that value. Otherwise return null.
+Constant *ConstantVector::getSplatValue() {
+  // Check out first element.
+  Constant *Elt = getOperand(0);
+  // Then make sure all remaining elements point to the same value.
+  for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
+    if (getOperand(I) != Elt) return 0;
+  return Elt;
+}
+
 //---- ConstantPointerNull::get() implementation...
 //