diff --git a/unittests/ASM/Primary/Primary_AE.asm b/unittests/ASM/Primary/Primary_AE.asm
new file mode 100644
index 000000000..179cc776b
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AE.asm
@@ -0,0 +1,43 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x1200",
+    "RDI": "0xE0000001"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4142434445464748
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 0]
+
+cld
+mov rax, 0x61
+scasb
+; cmp = 0x61 - 0x48 = 0x19
+; 0: CF - 00000000
+; 1:    - 00000010
+; 2: PF - 00000000
+; 3:  0 - 00000000
+; 4: AF - 00010000
+; 5:  0 - 00000000
+; 6: ZF - 00000000
+; 7: SF - 00000000
+; ================
+;         00010010
+; OF: LAHF doesn't load - 0
+
+mov rax, 0
+lahf
+
+hlt
diff --git a/unittests/ASM/Primary/Primary_AE_REP.asm b/unittests/ASM/Primary/Primary_AE_REP.asm
new file mode 100644
index 000000000..764228b09
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AE_REP.asm
@@ -0,0 +1,31 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RCX": "5",
+    "RDI": "0xE0000003"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4142434445466161
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 0]
+
+cld
+mov rax, 0x61
+mov rcx, 8
+cmp rax, 0x61
+
+rep scasb
+
+hlt
diff --git a/unittests/ASM/Primary/Primary_AE_REPNE.asm b/unittests/ASM/Primary/Primary_AE_REPNE.asm
new file mode 100644
index 000000000..9538040f0
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AE_REPNE.asm
@@ -0,0 +1,31 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RCX": "1",
+    "RDI": "0xE0000007"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4161434445464748
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 0]
+
+cld
+mov rax, 0x61
+mov rcx, 8
+cmp rax, 0
+
+repne scasb
+
+hlt
diff --git a/unittests/ASM/Primary/Primary_AE_REPNE_down.asm b/unittests/ASM/Primary/Primary_AE_REPNE_down.asm
new file mode 100644
index 000000000..2736c5214
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AE_REPNE_down.asm
@@ -0,0 +1,31 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RCX": "5",
+    "RDI": "0xE000000D"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4142434445464748
+mov [rdx + 8 * 0], rax
+mov rax, 0x5161535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 2]
+
+std
+mov rax, 0x61
+mov rcx, 8
+cmp rax, 0
+
+repne scasb
+
+hlt
diff --git a/unittests/ASM/Primary/Primary_AE_REP_down.asm b/unittests/ASM/Primary/Primary_AE_REP_down.asm
new file mode 100644
index 000000000..231587469
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AE_REP_down.asm
@@ -0,0 +1,31 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RCX": "7",
+    "RDI": "0xE000000F"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4142434445466161
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 2]
+
+std
+mov rax, 0x61
+mov rcx, 8
+cmp rax, 0x61
+
+rep scasb
+
+hlt
diff --git a/unittests/ASM/Primary/Primary_AF_REP_dword.asm b/unittests/ASM/Primary/Primary_AF_REP_dword.asm
new file mode 100644
index 000000000..b45495fe4
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AF_REP_dword.asm
@@ -0,0 +1,31 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RCX": "6",
+    "RDI": "0xE0000008"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4142434461626364
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 0]
+
+cld
+mov rax, 0x61626364
+mov rcx, 8
+cmp rax, 0x61626364
+
+rep scasd
+
+hlt
diff --git a/unittests/ASM/Primary/Primary_AF_REP_qword.asm b/unittests/ASM/Primary/Primary_AF_REP_qword.asm
new file mode 100644
index 000000000..5a2a09e49
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AF_REP_qword.asm
@@ -0,0 +1,32 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RCX": "6",
+    "RDI": "0xE0000010"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x6162636465666768
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 0]
+
+cld
+mov rax, 0x6162636465666768
+mov rbx, 0x6162636465666768
+mov rcx, 8
+cmp rax, rbx
+
+rep scasq
+
+hlt
diff --git a/unittests/ASM/Primary/Primary_AF_REP_word.asm b/unittests/ASM/Primary/Primary_AF_REP_word.asm
new file mode 100644
index 000000000..2fea40b86
--- /dev/null
+++ b/unittests/ASM/Primary/Primary_AF_REP_word.asm
@@ -0,0 +1,31 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RCX": "6",
+    "RDI": "0xE0000004"
+  },
+  "MemoryRegions": {
+    "0x100000000": "4096"
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4142434445466162
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+mov rax, 0x0
+mov [rdx + 8 * 2], rax
+
+lea rdi, [rdx + 8 * 0]
+
+cld
+mov rax, 0x6162
+mov rcx, 8
+cmp rax, 0x6162
+
+rep scasw
+
+hlt