[PATCH] Add a function to get the largest address space pointer size

[Matt Arsenault]

Some users of DataLayout::getPointerSize don't use it in an exact way, and aren't really using it for the pointer size. For example MemCpyOptimizer uses it as a guess for the maximum GPR width.

http://llvm-reviews.chandlerc.com/D1665

Files:
  include/llvm/IR/DataLayout.h

Index: include/llvm/IR/DataLayout.h
===================================================================
--- include/llvm/IR/DataLayout.h
+++ include/llvm/IR/DataLayout.h
@@ -265,6 +265,18 @@
     }
     return val->second.TypeBitWidth;
   }
+
+  /// Return the largest pointer size for known address spaces.
+  unsigned getMaxPointerSize() const {
+    unsigned MaxPtrSize = 0;
+    for (DenseMap<unsigned, PointerAlignElem>::const_iterator I
+           = Pointers.begin(), E = Pointers.end(); I != E; ++I) {
+      MaxPtrSize = std::max(MaxPtrSize, I->second.TypeBitWidth);
+    }
+
+    return (MaxPtrSize == 0) ? 64 : MaxPtrSize;
+  }
+
   /// Layout pointer size, in bits
   /// FIXME: The defaults need to be removed once all of
   /// the backends/clients are updated.
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