1 files changed, 84 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/asm.js/testSIMD-bitcasts.js b/js/src/jit-test/tests/asm.js/testSIMD-bitcasts.js
new file mode 100644
index 000000000..c5a5fb2bc
--- /dev/null
+++ b/js/src/jit-test/tests/asm.js/testSIMD-bitcasts.js
@@ -0,0 +1,84 @@
+load(libdir + "asm.js");
+load(libdir + "simd.js");
+load(libdir + "asserts.js");
+
+// Set to true to see more JS debugging spew.
+const DEBUG = false;
+
+if (!isSimdAvailable()) {
+    DEBUG && print("won't run tests as simd extensions aren't activated yet");
+    quit(0);
+}
+
+// Test all bit-casts and normal loads and stores.
+var heap = new ArrayBuffer(BUF_MIN);
+var asU8 = new Uint8Array(heap);
+var allTypes = [
+    "Int8x16",
+    "Int16x8",
+    "Int32x4",
+    "Uint8x16",
+    "Uint16x8",
+    "Uint32x4",
+    "Float32x4"
+];
+
+// Generate a load bit-cast store test function that performs:
+//
+// function f(a, b) {
+//     vec = src.load(H, a);
+//     cast = dst.from«src»Bits(vec);
+//     store(H, b, cast);
+// }
+//
+// Here, `H` is the heap provided by `heap`.
+function test_func(src, dst) {
+    text = `
+        "use asm";
+        var src = glob.SIMD.${src};
+        var dst = glob.SIMD.${dst};
+        var ld = src.load;
+        var st = dst.store;
+        var bc = dst.from${src}Bits;
+
+        var H = new glob.Uint8Array(heap);
+
+        function f(a, b) {
+            a = a|0;
+            b = b|0;
+
+            st(H, b, bc(ld(H, a)));
+        }
+
+        return f;
+    `;
+    return asmLink(asmCompile('glob', 'ffi', 'heap', text), this, null, heap);
+}
+
+function assertBuf16(a, b) {
+    for (let i=0; i < 16; i++) {
+        assertEq(asU8[a+i], asU8[b+i]);
+    }
+}
+
+for (let src of allTypes) {
+    for (let dst of allTypes) {
+        // Skip identity conversions.
+        if (src == dst) continue;
+
+        print(src, dst);
+        let f = test_func(src, dst);
+        // Initialize with pseudo-random data.
+        for (let i = 0; i < 64; i++) {
+            asU8[i] = (i + 17) * 97;
+        }
+
+        // Aligned load/store.
+        f(0, 16);
+        assertBuf16(0, 16);
+
+        // Unaligned access.
+        f(1, 27);
+        assertBuf16(1, 27);
+    }
+}