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-rw-r--r--test/arch/x86/arch.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/test/arch/x86/arch.py b/test/arch/x86/arch.py
index d48a707c..29df049d 100644
--- a/test/arch/x86/arch.py
+++ b/test/arch/x86/arch.py
@@ -1744,7 +1744,8 @@ reg_tests = [
      "0f1818"),
     (m32, "00000000    PREFETCHNTA BYTE PTR [EAX]",
      "0f1800"),
-
+    (m64, "00000000    PREFETCHW  BYTE PTR [RDI]",
+     "0f0d0f"),
 
     (m16, "00000000    PUSHW      AX",
      "50"),