Make sure to consider alignment of variable sized objects.

This, along with the previous dag combiner fix, fixes
CodeGen/Alpha/2006-04-04-zextload.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27403 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/MachineFrameInfo.h b/include/llvm/CodeGen/MachineFrameInfo.h
index 201136d85c0ba3159630be2014d263ea729b9f49..d6810bf4e5bad9375be1cb242dca7a86434d8a0e 100644 (file)
--- a/include/llvm/CodeGen/MachineFrameInfo.h
+++ b/include/llvm/CodeGen/MachineFrameInfo.h
@@ -225,6 +225,7 @@ public:
   ///
   int CreateVariableSizedObject() {
     HasVarSizedObjects = true;
+    if (MaxAlignment < 1) MaxAlignment = 1;
     Objects.push_back(StackObject(0, 1, -1));
     return Objects.size()-NumFixedObjects-1;
   }