diff --git a/implementation-contributed/javascriptcore/stress/big-int-subtraction-jit.js b/implementation-contributed/javascriptcore/stress/big-int-subtraction-jit.js
new file mode 100644
index 0000000000..2e1f6ae8c2
--- /dev/null
+++ b/implementation-contributed/javascriptcore/stress/big-int-subtraction-jit.js
@@ -0,0 +1,19 @@
+//@ runBigIntEnabled
+
+let assert = {
+    sameValue: function(i, e, m) {
+        if (i !== e)
+            throw new Error(m);
+    }
+}
+
+function bigIntAddition(x, y) {
+    return x - y - 1n;
+}
+noInline(bigIntAddition);
+
+for (let i = 0; i < 10000; i++) {
+    let r = bigIntAddition(3n, 10n);
+    assert.sameValue(r, -8n, 3n + " - " + 10n + " - 1 = " + r);
+}
+
diff --git a/implementation-contributed/javascriptcore/stress/value-sub-big-int-prediction-propagation.js b/implementation-contributed/javascriptcore/stress/value-sub-big-int-prediction-propagation.js
new file mode 100644
index 0000000000..44cbb28119
--- /dev/null
+++ b/implementation-contributed/javascriptcore/stress/value-sub-big-int-prediction-propagation.js
@@ -0,0 +1,18 @@
+//@ runBigIntEnabled
+
+function assert(v, e) {
+    if (v !== e)
+        throw new Error("Expected value: " + e + " but got: " + v)
+}
+
+function bigIntPropagation(a, b) {
+    let c = a - b;
+    return c - 0n;
+}
+noInline(bigIntPropagation);
+
+for (let i = 0; i < 100000; i++) {
+    let out = bigIntPropagation(0xffffffffffffffffffffffffffffffn, 0x1n);
+    assert(out, 0xfffffffffffffffffffffffffffffen)
+}
+
diff --git a/implementation-contributed/javascriptcore/stress/value-sub-big-int-untyped.js b/implementation-contributed/javascriptcore/stress/value-sub-big-int-untyped.js
new file mode 100644
index 0000000000..8c3f7ff2ad
--- /dev/null
+++ b/implementation-contributed/javascriptcore/stress/value-sub-big-int-untyped.js
@@ -0,0 +1,26 @@
+//@ runBigIntEnabled
+
+function assert(v, e) {
+    if (v !== e)
+        throw new Error("Expected value: " + e + " but got: " + v)
+}
+
+function bigIntOperations(a, b) {
+    let c = a - b;
+    return a - c;
+}
+noInline(bigIntOperations);
+
+c = 0;
+let o = { valueOf: function () {
+    c++;
+    return 0b1111n;
+}};
+
+for (let i = 0; i < 100000; i++) {
+    let out = bigIntOperations(o, 0b1010n);
+    assert(out, 10n);
+}
+
+assert(c, 200000);
+
diff --git a/implementation-contributed/javascriptcore/stress/value-sub-spec-none-case.js b/implementation-contributed/javascriptcore/stress/value-sub-spec-none-case.js
new file mode 100644
index 0000000000..2472cef9b3
--- /dev/null
+++ b/implementation-contributed/javascriptcore/stress/value-sub-spec-none-case.js
@@ -0,0 +1,22 @@
+function assert(a, e) {
+    if (a !== e)
+        throw new Error("Bad");
+}
+
+function valueSub() {
+    let sum = 0;
+    do {
+        // We trigger the JIT compilation of valueSub
+        // so Date.now() will have SpecNone as result
+        for (let i = 0; i < 10000; i++)
+            sum++;
+
+        sum += 0.5;
+    } while (Date.now() - sum  < 0);
+
+    assert(sum, 10000.5);
+}
+noInline(valueSub);
+
+valueSub();
+