samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/cudashared.t

@@ -0,0 +1,47 @@
+if not terralib.cudacompile then
+	print("CUDA not enabled, not performing test...")
+	return
+end
+
+local tid = cudalib.nvvm_read_ptx_sreg_tid_x--terralib.intrinsic("llvm.nvvm.read.ptx.sreg.tid.x",{} -> int)
+
+N = 1024
+
+somedata = cudalib.sharedmemory(int,N)
+
+terra bar(result : &int)
+    var t = tid()
+    somedata[t] = t
+    cudalib.nvvm_barrier0()
+    result[t] = somedata[N - 1 - t]  
+end
+
+terralib.includepath = terralib.includepath..";/usr/local/cuda/include"
+
+local C = terralib.includecstring [[
+#include "cuda_runtime.h"
+#include <stdlib.h>
+#include <stdio.h>
+]]
+
+local R = terralib.cudacompile({ bar = bar },true)
+
+
+terra doit(N : int)
+	var data : &int
+	C.cudaMalloc([&&opaque](&data),sizeof(int)*N)
+	var launch = terralib.CUDAParams { 1,1,1, N,1,1, 0, nil }
+	R.bar(&launch,data)
+	var results : &int = [&int](C.malloc(sizeof(int)*N))
+	C.cudaMemcpy(results,data,sizeof(int)*N,2)
+	var result = 0
+	for i = 0,N do
+	    --C.printf("result = %d\n",results[i])
+		result = result + results[i]
+	end
+	return result
+end
+
+local test = require("test")
+local expected = (N - 1)*N/2
+test.eq(doit(N),expected)