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-rw-r--r--src/arch/x86/types.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/arch/x86/types.hh b/src/arch/x86/types.hh
index a509ff57a..f8a5dbe34 100644
--- a/src/arch/x86/types.hh
+++ b/src/arch/x86/types.hh
@@ -110,6 +110,9 @@ namespace X86ISA
EndBitUnion(Sib)
BitUnion8(Rex)
+ //This bit doesn't mean anything according to the ISA, but in
+ //this implementation, it being set means an REX prefix was present.
+ Bitfield<6> present;
Bitfield<3> w;
Bitfield<2> r;
Bitfield<1> x;