1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testTypedArrayPunning.js b/js/src/jit-test/tests/basic/testTypedArrayPunning.js
new file mode 100644
index 0000000000..59f6b744fc
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testTypedArrayPunning.js
@@ -0,0 +1,42 @@
+function testNonCanonicalNan()
+{
+    const bytes = 128;
+    var buf = new ArrayBuffer(bytes);
+
+    /* create an array of non-canonical double nans */
+    var ui8arr = new Uint8Array(buf);
+    for (var i = 0; i < ui8arr.length; ++i)
+        ui8arr[i] = 0xff;
+
+    var dblarr = new Float64Array(buf);
+    assertEq(dblarr.length, bytes / 8);
+
+    /* ensure they are canonicalized */
+    for (var i = 0; i < dblarr.length; ++i) {
+        var asstr = dblarr[i] + "";
+        var asnum = dblarr[i] + 0.0;
+        assertEq(asstr, "NaN");
+        assertEq(asnum, NaN);
+    }
+
+    /* create an array of non-canonical float nans */
+    for (var i = 0; i < ui8arr.length; i += 4) {
+        ui8arr[i+0] = 0xffff;
+        ui8arr[i+1] = 0xffff;
+        ui8arr[i+2] = 0xffff;
+        ui8arr[i+3] = 0xffff;
+    }
+
+    var fltarr = new Float32Array(buf);
+    assertEq(fltarr.length, bytes / 4);
+
+    /* ensure they are canonicalized */
+    for (var i = 0; i < fltarr.length; ++i) {
+        var asstr = fltarr[i] + "";
+        var asnum = fltarr[i] + 0.0;
+        assertEq(asstr, "NaN");
+        assertEq(asnum, NaN);
+    }
+}
+
+testNonCanonicalNan();