vendor/llvm/llvm-trunk-r306325

1 files changed, 18 insertions, 0 deletions

diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 2a6cb07dbd2d..81c6dace92e0 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -21,6 +21,7 @@
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/Loads.h"
 #include "llvm/Analysis/MemoryLocation.h"
 #include "llvm/CodeGen/GlobalISel/RegisterBank.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
@@ -558,6 +559,23 @@ unsigned MachinePointerInfo::getAddrSpace() const {
   return cast<PointerType>(V.get<const Value*>()->getType())->getAddressSpace();
 }
 
+/// isDereferenceable - Return true if V is always dereferenceable for 
+/// Offset + Size byte.
+bool MachinePointerInfo::isDereferenceable(unsigned Size, LLVMContext &C,
+                                           const DataLayout &DL) const {
+  if (!V.is<const Value*>())
+    return false;
+
+  const Value *BasePtr = V.get<const Value*>();
+  if (BasePtr == nullptr)
+    return false;
+
+  return isDereferenceableAndAlignedPointer(BasePtr, 1,
+                                            APInt(DL.getPointerSize(),
+                                                  Offset + Size),
+                                            DL);
+}
+
 /// getConstantPool - Return a MachinePointerInfo record that refers to the
 /// constant pool.
 MachinePointerInfo MachinePointerInfo::getConstantPool(MachineFunction &MF) {