added double precision tests

tests/transcendentals-7-0.ispc

@@ -0,0 +1,23 @@
+static double double4(uniform double a, uniform double b, uniform double c, 
+                    uniform double d) {
+    double ret = 0;
+    for (uniform int i = 0; i < programCount; i += 4) {
+        ret = insert(ret, i + 0, a);
+        ret = insert(ret, i + 1, b);
+        ret = insert(ret, i + 2, c);
+        ret = insert(ret, i + 3, d);
+    }
+    return ret;
+}
+
+export uniform int width() { return programCount; }
+
+
+bool ok(double x, double ref) { return (abs(x - ref) < 1d-16) || abs((x-ref)/ref) < 1d-15; }
+
+export void f_v(uniform float RET[]) {
+    double v = double4((-3.141592741012573d0),(0.000000000000000d0),(3.141592741012573d0),(6.283185482025146d0));
+    double ref = double4((-8.742277955963587d-08),(0.000000000000000d0),(8.742277955963587d-08),(1.7484555911927306d-07));
+    RET[programIndex] = ok(tan(v), ref) ? 1. : 0.;
+}
+export void result(uniform float RET[]) { RET[programIndex] = 1.; }