diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index c903b08..a36e94b 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -5549,13 +5549,13 @@
 /// non-scalar-integer type, e.g. empty string source, constant, or loaded
 /// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
 /// constant so it does not need to be loaded.
-/// It returns EVT::Other if SelectionDAG should be responsible for
-/// determining the type.
+/// It returns EVT::Other if the type should be determined using generic
+/// target-independent logic.
 EVT PPCTargetLowering::getOptimalMemOpType(uint64_t Size,
                                            unsigned DstAlign, unsigned SrcAlign,
                                            bool NonScalarIntSafe,
                                            bool MemcpyStrSrc,
-                                           SelectionDAG &DAG) const {
+                                           MachineFunction &MF) const {
   if (this->PPCSubTarget.isPPC64()) {
     return MVT::i64;
   } else {
diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h
index f7d629b..13c57e6 100644
--- a/lib/Target/PowerPC/PPCISelLowering.h
+++ b/lib/Target/PowerPC/PPCISelLowering.h
@@ -357,12 +357,12 @@
     /// non-scalar-integer type, e.g. empty string source, constant, or loaded
     /// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
     /// constant so it does not need to be loaded.
-    /// It returns EVT::Other if SelectionDAG should be responsible for
-    /// determining the type.
+    /// It returns EVT::Other if the type should be determined using generic
+    /// target-independent logic.
     virtual EVT
     getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
                         bool NonScalarIntSafe, bool MemcpyStrSrc,
-                        SelectionDAG &DAG) const;
+                        MachineFunction &MF) const;
 
     /// getFunctionAlignment - Return the Log2 alignment of this function.
     virtual unsigned getFunctionAlignment(const Function *F) const;
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 440f55b..2693f9b 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1079,18 +1079,18 @@
 /// non-scalar-integer type, e.g. empty string source, constant, or loaded
 /// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
 /// constant so it does not need to be loaded.
-/// It returns EVT::Other if SelectionDAG should be responsible for
-/// determining the type.
+/// It returns EVT::Other if the type should be determined using generic
+/// target-independent logic.
 EVT
 X86TargetLowering::getOptimalMemOpType(uint64_t Size,
                                        unsigned DstAlign, unsigned SrcAlign,
                                        bool NonScalarIntSafe,
                                        bool MemcpyStrSrc,
-                                       SelectionDAG &DAG) const {
+                                       MachineFunction &MF) const {
   // FIXME: This turns off use of xmm stores for memset/memcpy on targets like
   // linux.  This is because the stack realignment code can't handle certain
   // cases like PR2962.  This should be removed when PR2962 is fixed.
-  const Function *F = DAG.getMachineFunction().getFunction();
+  const Function *F = MF.getFunction();
   if (NonScalarIntSafe &&
       !F->hasFnAttr(Attribute::NoImplicitFloat)) {
     if (Size >= 16 &&
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index 7fa65cb..ca1a259 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -426,12 +426,12 @@
     /// non-scalar-integer type, e.g. empty string source, constant, or loaded
     /// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
     /// constant so it does not need to be loaded.
-    /// It returns EVT::Other if SelectionDAG should be responsible for
-    /// determining the type.
+    /// It returns EVT::Other if the type should be determined using generic
+    /// target-independent logic.
     virtual EVT
     getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
                         bool NonScalarIntSafe, bool MemcpyStrSrc,
-                        SelectionDAG &DAG) const;
+                        MachineFunction &MF) const;
 
     /// allowsUnalignedMemoryAccesses - Returns true if the target allows
     /// unaligned memory accesses. of the specified type.