diff --git a/ptxtest/test.ispc b/ptxtest/test.ispc
new file mode 100644
index 00000000..d5fa2474
--- /dev/null
+++ b/ptxtest/test.ispc
@@ -0,0 +1,10 @@
+export void saxpy(const uniform float a, const uniform float x_[], const uniform float y_[], uniform float z_[], const uniform int n)
+{
+  foreach (i = 0 ... n)
+  {
+     const float x = x_[i];
+     const float y = y_[i];
+     const float z = y + a*x;
+     z_[i] = rsqrt(z);
+  }
+}