1 files changed, 6 insertions, 0 deletions
diff --git a/src/emu/x64runf20f.c b/src/emu/x64runf20f.c
index 18ec9645..44e77a1b 100644
--- a/src/emu/x64runf20f.c
+++ b/src/emu/x64runf20f.c
@@ -53,6 +53,12 @@ int RunF20F(x64emu_t *emu, rex_t rex)
         GETGX;
         EX->q[0] = GX->q[0];
         break;
+    case 0x12:  /* MOVDDUP Gx, Ex */
+        nextop = F8;
+        GETEX(0);
+        GETGX;
+        GX->q[1] = GX->q[0] = EX->q[0];
+        break;
 
     case 0x2A:  /* CVTSI2SD Gx, Ed */
         nextop = F8;