diff --git a/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp b/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
index 1844e44..58716b7 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
@@ -409,9 +409,23 @@
 /// instruction, using the specified assembler variant.  Targets should
 /// override this to format as appropriate.
 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
-                                 unsigned AsmVariant, const char *ExtraCode,
-                                 raw_ostream &O) {
-  // Target doesn't support this yet!
+    unsigned AsmVariant, const char *ExtraCode,
+    raw_ostream &O) {
+  // Does this asm operand have a single letter operand modifier?
+  if (ExtraCode && ExtraCode[0]) {
+    if (ExtraCode[1] != 0) return true; // Unknown modifier.
+
+    const MachineOperand &MO = MI->getOperand(OpNo);
+    switch (ExtraCode[0]) {
+    default:
+      return true;  // Unknown modifier.
+    case 'c': // Substitute immediate value without immediate syntax
+      if ((MO.getType()) != MachineOperand::MO_Immediate)
+        return true;
+      O << MO.getImm();
+      return false;
+    }
+  }
   return true;
 }
 
diff --git a/lib/Target/Mips/MipsAsmPrinter.cpp b/lib/Target/Mips/MipsAsmPrinter.cpp
index d6de132..abf5d0f 100644
--- a/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -301,7 +301,8 @@
     const MachineOperand &MO = MI->getOperand(OpNum);
     switch (ExtraCode[0]) {
     default:
-      return true;  // Unknown modifier.
+      // See if this is a generic print operand
+      return AsmPrinter::PrintAsmOperand(MI,OpNum,AsmVariant,ExtraCode,O);
     case 'X': // hex const int
       if ((MO.getType()) != MachineOperand::MO_Immediate)
         return true;
diff --git a/test/CodeGen/Mips/asm-large-immediate.ll b/test/CodeGen/Mips/asm-large-immediate.ll
new file mode 100644
index 0000000..d9bb0ca
--- /dev/null
+++ b/test/CodeGen/Mips/asm-large-immediate.ll
@@ -0,0 +1,10 @@
+; RUNx: llc -march=mipsel < %s | grep 68719476738
+
+; RUN: llc -march=mipsel < %s | FileCheck %s
+define void @test() {
+entry:
+; CHECK: /* result: 68719476738 */
+        tail call void asm sideeffect "/* result: ${0:c} */", "i,~{dirflag},~{fpsr},~{flags}"( i64 68719476738 )
+        ret void
+}
+