diff --git a/code/vadda_b.cpp b/code/vadda_b.cpp
new file mode 100644
index 00000000..f1d86462
--- /dev/null
+++ b/code/vadda_b.cpp
@@ -0,0 +1,9 @@
+#include "common.h"
+
+v128 vadda_b(v128 a, v128 b) {
+  v128 dst;
+#include "vadda_b.h"
+  return dst;
+}
+
+void test() { FUZZ2(vadda_b); }
diff --git a/code/vadda_b.h b/code/vadda_b.h
index dae37a17..46159449 100644
--- a/code/vadda_b.h
+++ b/code/vadda_b.h
@@ -1,3 +1,3 @@
 for (int i = 0; i < 16; i++) {
-  dst.byte[i] = abs(a.byte[i]) + abs(b.byte[i]);
+  dst.byte[i] = abs((s8)a.byte[i]) + abs((s8)b.byte[i]);
 }
diff --git a/code/vadda_d.cpp b/code/vadda_d.cpp
new file mode 100644
index 00000000..ba1405c6
--- /dev/null
+++ b/code/vadda_d.cpp
@@ -0,0 +1,9 @@
+#include "common.h"
+
+v128 vadda_d(v128 a, v128 b) {
+  v128 dst;
+#include "vadda_d.h"
+  return dst;
+}
+
+void test() { FUZZ2(vadda_d); }
diff --git a/code/vadda_d.h b/code/vadda_d.h
index 7cd9a55b..72e48397 100644
--- a/code/vadda_d.h
+++ b/code/vadda_d.h
@@ -1,4 +1,4 @@
 for (int i = 0; i < 2; i++) {
-  dst.dword[i] = abs(a.dword[i]) + abs(b.dword[i]);
+  dst.dword[i] = abs((s64)a.dword[i]) + abs((s64)b.dword[i]);
 }
 
diff --git a/code/vadda_h.cpp b/code/vadda_h.cpp
new file mode 100644
index 00000000..d9216b91
--- /dev/null
+++ b/code/vadda_h.cpp
@@ -0,0 +1,10 @@
+#include "common.h"
+
+v128 vadda_h(v128 a, v128 b) {
+  v128 dst;
+#include "vadda_h.h"
+  return dst;
+}
+
+void test() { FUZZ2(vadda_h); }
+
diff --git a/code/vadda_h.h b/code/vadda_h.h
index 1085bfcc..6e6f3762 100644
--- a/code/vadda_h.h
+++ b/code/vadda_h.h
@@ -1,4 +1,4 @@
 for (int i = 0; i < 8; i++) {
-  dst.half[i] = abs(a.half[i]) + abs(b.half[i]);
+  dst.half[i] = abs((s16)a.half[i]) + abs((s16)b.half[i]);
 }
 
diff --git a/code/vadda_w.cpp b/code/vadda_w.cpp
new file mode 100644
index 00000000..3e7ad2c2
--- /dev/null
+++ b/code/vadda_w.cpp
@@ -0,0 +1,10 @@
+#include "common.h"
+
+v128 vadda_w(v128 a, v128 b) {
+  v128 dst;
+#include "vadda_w.h"
+  return dst;
+}
+
+void test() { FUZZ2(vadda_w); }
+
diff --git a/code/vadda_w.h b/code/vadda_w.h
index 1fc815d3..a99972c4 100644
--- a/code/vadda_w.h
+++ b/code/vadda_w.h
@@ -1,3 +1,3 @@
 for (int i = 0; i < 4; i++) {
-  dst.word[i] = abs(a.word[i]) + abs(b.word[i]);
+  dst.word[i] = abs((s32)a.word[i]) + abs((s32)b.word[i]);
 }
diff --git a/main.py b/main.py
index e34e5c23..4f7b38e5 100644
--- a/main.py
+++ b/main.py
@@ -1,4 +1,5 @@
 import math
+import os
 
 def define_env(env):
     widths = {
@@ -30,6 +31,10 @@ def include(file):
 
     def instruction(intrinsic, instr, desc):
         file_name = instr.split(" ")[0].replace(".", "_")
+        if os.path.exists(f"code/{file_name}.cpp"):
+            tested = "Tested on real machine."
+        else:
+            tested = ""
         return f"""
 ## {intrinsic}
 
@@ -51,6 +56,9 @@ def instruction(intrinsic, instr, desc):
 ```c++
 {include(f'{file_name}.h')}
 ```
+
+{tested}
+
 """
 
     @env.macro