We can only fold a load into an op if there is exactly one use of the value.

Checking to see if the load has two uses is not equivalent, as the chain
value may have zero uses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19518 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ISelPattern.cpp

@@ -979,7 +979,8 @@ bool ISel::isFoldableLoad(SDOperand Op) {
   // If this load has already been emitted, we clearly can't fold it.
   if (ExprMap.count(Op)) return false;
 
-  return Op.Val->use_size() == 2;
+  // Finally, there can only be one use of its value.
+  return Op.Val->hasNUsesOfValue(1, 0);
 }
 
 /// EmitFoldedLoad - Ensure that the arguments of the load are code generated,