diff --git a/unittests/ASM/Secondary/09_XX_01.asm b/unittests/ASM/Secondary/09_XX_01.asm
new file mode 100644
index 000000000..44af58d15
--- /dev/null
+++ b/unittests/ASM/Secondary/09_XX_01.asm
@@ -0,0 +1,40 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x80000000",
+    "RDX": "0xFFFFFFFF",
+    "RBX": "0x41424344",
+    "RCX": "0x51525354",
+    "R13": "0x5152535441424344",
+    "R14": "0x1"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov r15, 0xe0000000
+
+mov rax, 0xFFFFFFFF80000000
+mov [r15 + 8 * 0], rax
+
+mov r14, 0
+; Expected
+mov eax, 0x80000000
+mov edx, 0xFFFFFFFF
+
+; Desired
+mov ebx, 0x41424344
+mov ecx, 0x51525354
+
+cmpxchg8b [r15]
+
+; Set r14 to 1 if if the memory location was expected
+setz r14b
+
+; edx and eax will now contain the memory's data
+
+; Check memory location to ensure it contains what we want
+mov r13, [r15 + 8 * 0]
+hlt
diff --git a/unittests/ASM/Secondary/09_XX_01_2.asm b/unittests/ASM/Secondary/09_XX_01_2.asm
new file mode 100644
index 000000000..0e9fc95a2
--- /dev/null
+++ b/unittests/ASM/Secondary/09_XX_01_2.asm
@@ -0,0 +1,40 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x80000000",
+    "RDX": "0xFFFFFFFF",
+    "RBX": "0x41424344",
+    "RCX": "0x51525354",
+    "R13": "0xFFFFFFFF80000000",
+    "R14": "0x0"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov r15, 0xe0000000
+
+mov rax, 0xFFFFFFFF80000000
+mov [r15 + 8 * 0], rax
+
+mov r14, 0
+; Expected
+mov eax, 0xFFFFFFFF
+mov edx, 0xFFFFFFFF
+
+; Desired
+mov ebx, 0x41424344
+mov ecx, 0x51525354
+
+cmpxchg8b [r15]
+
+; Set r14 to 1 if if the memory location was expected
+setz r14b
+
+; edx and eax will now contain the memory's data
+
+; Check memory location to ensure it contains what we want
+mov r13, [r15 + 8 * 0]
+hlt
diff --git a/unittests/ASM/Secondary/09_XX_01_3.asm b/unittests/ASM/Secondary/09_XX_01_3.asm
new file mode 100644
index 000000000..f88f9fb9a
--- /dev/null
+++ b/unittests/ASM/Secondary/09_XX_01_3.asm
@@ -0,0 +1,45 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x4142434445464748",
+    "RDX": "0x5152535455565758",
+    "RBX": "0x6162636465666768",
+    "RCX": "0x7172737475767778",
+    "R12": "0x6162636465666768",
+    "R13": "0x7172737475767778",
+    "R14": "0x1"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov r15, 0xe0000000
+
+mov rax, 0x4142434445464748
+mov [r15 + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [r15 + 8 * 1], rax
+
+mov r14, 0
+; Expected
+mov rax, 0x4142434445464748
+mov rdx, 0x5152535455565758
+
+; Desired
+mov rbx, 0x6162636465666768
+mov rcx, 0x7172737475767778
+
+cmpxchg16b [r15]
+
+; Set r14 to 1 if if the memory location was expected
+setz r14b
+
+; rdx and rax will now contain the memory's data
+
+; Check memory location to ensure it contains what we want
+mov r12, [r15 + 8 * 0]
+mov r13, [r15 + 8 * 1]
+
+hlt
diff --git a/unittests/ASM/Secondary/09_XX_01_4.asm b/unittests/ASM/Secondary/09_XX_01_4.asm
new file mode 100644
index 000000000..6e2b8a1e3
--- /dev/null
+++ b/unittests/ASM/Secondary/09_XX_01_4.asm
@@ -0,0 +1,45 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x4142434445464748",
+    "RDX": "0x5152535455565758",
+    "RBX": "0x6162636465666768",
+    "RCX": "0x7172737475767778",
+    "R12": "0x4142434445464748",
+    "R13": "0x5152535455565758",
+    "R14": "0x0"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov r15, 0xe0000000
+
+mov rax, 0x4142434445464748
+mov [r15 + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [r15 + 8 * 1], rax
+
+mov r14, 0
+; Expected
+mov rax, 0x41424344FFFFFFFF
+mov rdx, 0x5152535455565758
+
+; Desired
+mov rbx, 0x6162636465666768
+mov rcx, 0x7172737475767778
+
+cmpxchg16b [r15]
+
+; Set r14 to 1 if if the memory location was expected
+setz r14b
+
+; rdx and rax will now contain the memory's data
+
+; Check memory location to ensure it contains what we want
+mov r12, [r15 + 8 * 0]
+mov r13, [r15 + 8 * 1]
+
+hlt