Index: include/llvm/Target/TargetMachine.h
===================================================================
--- include/llvm/Target/TargetMachine.h
+++ include/llvm/Target/TargetMachine.h
@@ -259,6 +259,10 @@
   /// PEI. If false (virtual-register machines), then callee-save register
   /// spilling and scavenging are not needed or used.
   virtual bool usesPhysRegsForPEI() const { return true; }
+
+  virtual bool useIPRA() const {
+    return false;
+  }
 };
 
 /// This class describes a target machine that is implemented with the LLVM
Index: lib/Target/TargetMachine.cpp
===================================================================
--- lib/Target/TargetMachine.cpp
+++ lib/Target/TargetMachine.cpp
@@ -47,6 +47,10 @@
       RequireStructuredCFG(false), DefaultOptions(Options), Options(Options) {
   if (EnableIPRA.getNumOccurrences())
     this->Options.EnableIPRA = EnableIPRA;
+  else {
+    // If not explicitly specified, use target default.
+    this->Options.EnableIPRA = useIPRA();
+  }
 }
 
 TargetMachine::~TargetMachine() {