first commit

examples_ptx/bandwidthTest/bandwidthTest.ispc

@@ -0,0 +1,30 @@
+typedef double T;
+
+task
+void copyKernel(
+    uniform T dst[],
+    uniform T src[],
+    uniform int nTotal)
+{
+  const uniform int blockIdx = taskIndex;
+  const uniform int blockDim = (nTotal + taskCount - 1) / taskCount;
+  const uniform int blockBeg =     blockIdx * blockDim;
+  const uniform int blockEnd = min(blockBeg + blockDim, nTotal);
+
+  foreach (i = blockBeg ... blockEnd)
+    src[i] = dst[i];
+}
+
+export 
+void copy(
+    uniform T dst[],
+    uniform T src[],
+    uniform int nTotal)
+{
+  uniform int nTask = num_cores() * 4;
+#ifdef __NVPTX__
+  nTask  = nTotal/(8*programCount);
+#endif
+
+  launch [nTask] copyKernel(dst, src, nTotal);
+}