diff --git a/lib/Target/X86/X86.td b/lib/Target/X86/X86.td
index ac0141bcb17..9f64b1a6877 100644
--- a/lib/Target/X86/X86.td
+++ b/lib/Target/X86/X86.td
@@ -40,9 +40,6 @@ def X86InstrInfo : InstrInfo {
                        "ImmTypeBits",
                        "FPFormBits",
                        "printImplicitUsesAfter", 
-                       "printImplicitUsesBefore",
-                       "printImplicitDefsBefore",
-                       "printImplicitDefsAfter",
                        "Opcode"];
   let TSFlagsShifts = [0,
                        5,
@@ -51,10 +48,7 @@ def X86InstrInfo : InstrInfo {
                        13,
                        15,
                        18,
-                       19,
-                       20,
-                       21,
-                       22];
+                       19];
 }
 
 def X86 : Target {
diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h
index eb920d67d87..eaaa1f08934 100644
--- a/lib/Target/X86/X86InstrInfo.h
+++ b/lib/Target/X86/X86InstrInfo.h
@@ -169,16 +169,7 @@ namespace X86II {
     // the normal operands.
     PrintImplUsesAfter = 1 << 18,
 
-    // PrintImplUsesBefore - Print out implicit uses in the assembly output
-    // before the normal operands.
-    PrintImplUsesBefore = 1 << 19,
-
-    // PrintImplDefsAfter - Print out implicit defs in the assembly output
-    // after the normal operands.
-    PrintImplDefsBefore = 1 << 20,
-    PrintImplDefsAfter  = 1 << 21,
-
-    OpcodeShift   = 22,
+    OpcodeShift   = 19,
     OpcodeMask    = 0xFF << OpcodeShift,
     // Bits 27 -> 31 are unused
   };
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index 6c6eb248e24..2ec2cb17fa1 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -88,16 +88,9 @@ class X86Inst<string nam, bits<8> opcod, Format f, MemType m, ImmType i> : Instr
   //
   bit hasOpSizePrefix = 0; // Does this inst have a 0x66 prefix?
 
-  // Flag whether implicit register usage is printed before/after the
-  // instruction
-  bit printImplicitUsesBefore = 0;
+  // Flag whether implicit register usage is printed after the instruction.
   bit printImplicitUsesAfter  = 0;
 
-  // Flag whether implicit register definitions are printed before/after the
-  // instruction
-  bit printImplicitDefsBefore = 0;
-  bit printImplicitDefsAfter  = 0;
-
   bits<4> Prefix = 0;       // Which prefix byte does this inst have?
   FPFormat FPForm;          // What flavor of FP instruction is this?
   bits<3> FPFormBits = 0;