1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrFormats.td b/lib/Target/X86/X86InstrFormats.td
index c26ea01..eeed5bd 100644
--- a/lib/Target/X86/X86InstrFormats.td
+++ b/lib/Target/X86/X86InstrFormats.td
@@ -63,6 +63,8 @@ class OpSize { bit hasOpSizePrefix = 1; }
 class AdSize { bit hasAdSizePrefix = 1; }
 class REX_W  { bit hasREX_WPrefix = 1; }
 class LOCK   { bit hasLockPrefix = 1; }
+class SegFS  { bits<2> SegOvrBits = 1; }
+class SegGS  { bits<2> SegOvrBits = 2; }
 class TB     { bits<4> Prefix = 1; }
 class REP    { bits<4> Prefix = 2; }
 class D8     { bits<4> Prefix = 3; }
@@ -104,6 +106,7 @@ class X86Inst<bits<8> opcod, Format f, ImmType i, dag outs, dag ins,
   FPFormat FPForm;          // What flavor of FP instruction is this?
   bits<3> FPFormBits = 0;
   bit hasLockPrefix = 0;    // Does this inst have a 0xF0 prefix?
+  bits<2> SegOvrBits = 0;   // Segment override prefix.
 }
 
 class I<bits<8> o, Format f, dag outs, dag ins, string asm, list<dag> pattern>