Index: lib/Target/X86/AsmParser/X86AsmParser.cpp
===================================================================
--- lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -2360,7 +2360,7 @@
     Name == "lock" || Name == "rep" ||
     Name == "repe" || Name == "repz" ||
     Name == "repne" || Name == "repnz" ||
-    Name == "rex64" || Name == "data16";
+    Name == "rex64" || Name == "data16" || Name == "data32";
 
   bool CurlyAsEndOfStatement = false;
   // This does the actual operand parsing.  Don't parse any more if we have a
Index: lib/Target/X86/X86InstrInfo.td
===================================================================
--- lib/Target/X86/X86InstrInfo.td
+++ lib/Target/X86/X86InstrInfo.td
@@ -1965,7 +1965,12 @@
                      Requires<[In64BitMode]>;
 
 // Data16 instruction prefix
-def DATA16_PREFIX : I<0x66, RawFrm, (outs),  (ins), "data16", []>;
+def DATA16_PREFIX : I<0x66, RawFrm, (outs),  (ins), "data16", []>, 
+                     Requires<[Not16BitMode]>;
+
+// Data instruction prefix
+def DATA32_PREFIX : I<0x66, RawFrm, (outs),  (ins), "data32", []>, 
+                     Requires<[In16BitMode]>;
 
 // Repeat string operation instruction prefixes
 // These uses the DF flag in the EFLAGS register to inc or dec ECX
Index: test/MC/X86/x86-16.s
===================================================================
--- test/MC/X86/x86-16.s
+++ test/MC/X86/x86-16.s
@@ -959,3 +959,19 @@
 // CHECK: lretl
 // CHECK: encoding: [0x66,0xcb]
 lretl
+
+// CHECK: data32
+// CHECK: encoding: [0x66]
+data32
+
+// CHECK: data32
+// CHECK: encoding: [0x66]
+// CHECK: lgdtw 4(%eax)
+// CHECK:  encoding: [0x67,0x0f,0x01,0x50,0x04]
+data32 lgdt 4(%eax)
+
+// CHECK: data32
+// CHECK: encoding: [0x66]
+// CHECK: lgdtw 4(%eax)
+// CHECK:  encoding: [0x67,0x0f,0x01,0x50,0x04]
+data32 lgdtw 4(%eax)
Index: test/MC/X86/x86-32.s
===================================================================
--- test/MC/X86/x86-32.s
+++ test/MC/X86/x86-32.s
@@ -1079,3 +1079,15 @@
 // CHECK: lretw
 // CHECK: encoding: [0x66,0xcb]
 lretw
+
+// CHECK: data16
+// CHECK: encoding: [0x66]
+// CHECK: lgdtl 4(%eax)
+// CHECK:  encoding: [0x0f,0x01,0x50,0x04]
+data16 lgdt 4(%eax)
+
+// CHECK: data16
+// CHECK: encoding: [0x66]
+// CHECK: lgdtl 4(%eax)
+// CHECK:  encoding: [0x0f,0x01,0x50,0x04]
+data16 lgdtl 4(%eax)
Index: test/MC/X86/x86-64.s
===================================================================
--- test/MC/X86/x86-64.s
+++ test/MC/X86/x86-64.s
@@ -1119,6 +1119,18 @@
 rex64 // CHECK: rex64 # encoding: [0x48]
 data16 // CHECK: data16 # encoding: [0x66]
 
+// CHECK: data16
+// CHECK: encoding: [0x66]
+// CHECK: lgdtq 4(%rax)
+// CHECK:  encoding: [0x0f,0x01,0x50,0x04]
+data16 lgdt 4(%rax)
+
+// CHECK: data16
+// CHECK: encoding: [0x66]
+// CHECK: lgdtq 4(%rax)
+// CHECK:  encoding: [0x0f,0x01,0x50,0x04]
+data16 lgdtq 4(%rax)
+
 // PR8855
 movq 18446744073709551615,%rbx   // CHECK: movq	-1, %rbx
 
Index: utils/TableGen/X86DisassemblerTables.cpp
===================================================================
--- utils/TableGen/X86DisassemblerTables.cpp
+++ utils/TableGen/X86DisassemblerTables.cpp
@@ -879,6 +879,10 @@
                                            newInfo.name == "XCHG64ar"))
           continue; // special case for XCHG*ar and NOOP
 
+        if (previousInfo.name == "DATA16_PREFIX" &&
+            newInfo.name == "DATA32_PREFIX")
+          continue; // special case for data16 and data32
+
         if (outranks(previousInfo.insnContext, newInfo.insnContext))
           continue;