3 files changed, 6 insertions, 0 deletions
diff --git a/test/long_mode/mod.rs b/test/long_mode/mod.rs
index 0b6dcc6..6d12c8d 100644
--- a/test/long_mode/mod.rs
+++ b/test/long_mode/mod.rs
@@ -2852,6 +2852,8 @@ fn test_adx() {
 #[test]
 fn test_prefetchw() {
     test_display(&[0x0f, 0x0d, 0x08], "prefetchw zmmword [rax]");
+    test_display(&[0x0f, 0x0d, 0x00], "nop zmmword [rax]");
+    test_invalid(&[0x0f, 0x0d, 0xc0]);
 }
 
 #[test]
diff --git a/test/protected_mode/mod.rs b/test/protected_mode/mod.rs
index d5533cc..800c5ec 100644
--- a/test/protected_mode/mod.rs
+++ b/test/protected_mode/mod.rs
@@ -2500,6 +2500,8 @@ fn test_adx() {
 #[test]
 fn test_prefetchw() {
     test_display(&[0x0f, 0x0d, 0x08], "prefetchw zmmword [eax]");
+    test_display(&[0x0f, 0x0d, 0x00], "nop zmmword [eax]");
+    test_invalid(&[0x0f, 0x0d, 0xc0]);
 }
 
 #[test]
diff --git a/test/real_mode/mod.rs b/test/real_mode/mod.rs
index af8bfaf..b866aa0 100644
--- a/test/real_mode/mod.rs
+++ b/test/real_mode/mod.rs
@@ -170,6 +170,8 @@ fn test_real_mode() {
     test_display(&[0x0f, 0x06], "clts");
     test_display(&[0x0f, 0x07], "sysret");
     test_display(&[0x0f, 0x0d, 0x08], "prefetchw zmmword [bx + si * 1]");
+    test_display(&[0x0f, 0x0d, 0x00], "nop zmmword [bx + si * 1]");
+    test_invalid(&[0x0f, 0x0d, 0xc0]);
     test_display(&[0x0f, 0x0f, 0x38, 0x8e], "pfpnacc mm7, qword [bx + si * 1]");
     test_display(&[0x0f, 0x0f, 0xc6, 0xb7], "pmulhrw mm0, mm6");
     test_display(&[0x0f, 0x0f, 0xe0, 0x8a], "pfnacc mm4, mm0");