Index: lib/Target/X86/X86InstrFPStack.td
===================================================================
--- lib/Target/X86/X86InstrFPStack.td
+++ lib/Target/X86/X86InstrFPStack.td
@@ -631,6 +631,9 @@
 def FNINIT : I<0xDB, MRM_E3, (outs), (ins), "fninit", [], IIC_FNINIT>;
 def FFREE : FPI<0xDD, MRM0r, (outs), (ins RST:$reg),
                 "ffree\t$reg", IIC_FFREE>;
+def FFREEP : FPI<0xDF, MRM0r, (outs), (ins RST:$reg),
+                "ffreep\t$reg", IIC_FFREE>;
+
 // Clear exceptions
 
 let Defs = [FPSW] in
Index: test/MC/Disassembler/X86/fp-stack.txt
===================================================================
--- test/MC/Disassembler/X86/fp-stack.txt
+++ test/MC/Disassembler/X86/fp-stack.txt
@@ -985,6 +985,30 @@
 # CHECK: fdivrp %st(7)
 0xde,0xff
 
+# CHECK: ffreep %st(0)
+0xdf,0xc0
+
+# CHECK: ffreep %st(1)
+0xdf,0xc1
+
+# CHECK: ffreep %st(2)
+0xdf,0xc2
+
+# CHECK: ffreep %st(3)
+0xdf,0xc3
+
+# CHECK: ffreep %st(4)
+0xdf,0xc4
+
+# CHECK: ffreep %st(5)
+0xdf,0xc5
+
+# CHECK: ffreep %st(6)
+0xdf,0xc6
+
+# CHECK: ffreep %st(7)
+0xdf,0xc7
+
 # CHECK: fnstsw %ax
 0xdf,0xe0
 
Index: test/MC/X86/x86-32-coverage.s
===================================================================
--- test/MC/X86/x86-32-coverage.s
+++ test/MC/X86/x86-32-coverage.s
@@ -2747,6 +2747,10 @@
 // CHECK:  encoding: [0xdd,0xc2]
         	ffree	%st(2)
 
+// CHECK: ffreep	%st(2)
+// CHECK:  encoding: [0xdf,0xc2]
+        	ffreep	%st(2)
+
 // CHECK: fnop
 // CHECK:  encoding: [0xd9,0xd0]
         	fnop