1 files changed, 53 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/sunspider/check-math-spectral-norm.js b/js/src/jit-test/tests/sunspider/check-math-spectral-norm.js
new file mode 100644
index 0000000000..824863c6a5
--- /dev/null
+++ b/js/src/jit-test/tests/sunspider/check-math-spectral-norm.js
@@ -0,0 +1,53 @@
+// The Great Computer Language Shootout
+// http://shootout.alioth.debian.org/
+//
+// contributed by Ian Osgood
+
+function A(i,j) {
+  return 1/((i+j)*(i+j+1)/2+i+1);
+}
+
+function Au(u,v) {
+  for (var i=0; i<u.length; ++i) {
+    var t = 0;
+    for (var j=0; j<u.length; ++j)
+      t += A(i,j) * u[j];
+    v[i] = t;
+  }
+}
+
+function Atu(u,v) {
+  for (var i=0; i<u.length; ++i) {
+    var t = 0;
+    for (var j=0; j<u.length; ++j)
+      t += A(j,i) * u[j];
+    v[i] = t;
+  }
+}
+
+function AtAu(u,v,w) {
+  Au(u,w);
+  Atu(w,v);
+}
+
+function spectralnorm(n) {
+  var i, u=[], v=[], w=[], vv=0, vBv=0;
+  for (i=0; i<n; ++i) {
+    u[i] = 1; v[i] = w[i] = 0;
+  }
+  for (i=0; i<10; ++i) {
+    AtAu(u,v,w);
+    AtAu(v,u,w);
+  }
+  for (i=0; i<n; ++i) {
+    vBv += u[i]*v[i];
+    vv  += v[i]*v[i];
+  }
+  return Math.sqrt(vBv/vv);
+}
+
+var actual = '';
+for (var i = 6; i <= 48; i *= 2) {
+  actual += spectralnorm(i) + ',';
+}
+assertEq(actual, "1.2657786149754053,1.2727355112619148,1.273989979775574,1.274190125290389,");