diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 81c6dac..7be3b1a 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -447,6 +447,14 @@
       SmallString<16> Str;
       getFPImm()->getValueAPF().toString(Str);
       OS << "quad " << Str;
+    } else if (getFPImm()->getType()->isX86_FP80Ty()) {
+      APFloat APF = getFPImm()->getValueAPF();
+      OS << "x86_fp80 0xK";
+      APInt API = APF.bitcastToAPInt();
+      OS << format_hex_no_prefix(API.getHiBits(16).getZExtValue(), 4,
+                                 /*Upper=*/true);
+      OS << format_hex_no_prefix(API.getLoBits(64).getZExtValue(), 16,
+                                 /*Upper=*/true);
     } else {
       OS << getFPImm()->getValueAPF().convertToDouble();
     }