1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/tests/ecma_7/SIMD/bug953270.js b/js/src/tests/ecma_7/SIMD/bug953270.js
new file mode 100644
index 000000000..db6a0d7cb
--- /dev/null
+++ b/js/src/tests/ecma_7/SIMD/bug953270.js
@@ -0,0 +1,24 @@
+// |reftest| skip-if(!this.hasOwnProperty("SIMD"))
+
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+// Check that NaN normalization is applied when extracting the x lane
+// out, after bit conversion has occurred.
+
+var Int32x4 = SIMD.Int32x4;
+var a = Int32x4((4294967295), 200, 300, 400);
+var c = SIMD.Float32x4.fromInt32x4Bits(a);
+
+// NaN canonicalization occurs when extracting out x lane:
+assertEq(SIMD.Float32x4.extractLane(c, 0), NaN);
+
+// but underlying bits are faithfully transmitted
+// (though reinterpreted as a signed integer):
+var d = SIMD.Int32x4.fromFloat32x4Bits(c);
+assertEq(SIMD.Int32x4.extractLane(d, 0), -1);
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);