diff --git a/examples_ptx/stencil/Makefile_gpu b/examples_ptx/stencil/Makefile_gpu
index 5b6e4cbf..a31052ca 100644
--- a/examples_ptx/stencil/Makefile_gpu
+++ b/examples_ptx/stencil/Makefile_gpu
@@ -2,7 +2,7 @@ PROG=stencil
 ISPC_SRC=stencil.ispc
 CU_SRC=stencil.cu
 CXX_SRC=stencil.cpp  stencil_serial.cpp
-PTXCC_REGMAX=128
+PTXCC_REGMAX=92
 
 LLVM_GPU=1
 NVVM_GPU=1
diff --git a/examples_ptx/stencil/stencil.cu b/examples_ptx/stencil/stencil.cu
index 28e9bbcf..c5847cb8 100644
--- a/examples_ptx/stencil/stencil.cu
+++ b/examples_ptx/stencil/stencil.cu
@@ -22,7 +22,7 @@ stencil_step( int x0,  int x1,
         const int x = xb + programIndex;
 
         int index = (z * Nxy) + (y * Nx) + x;
-#define A_cur(x, y, z) __ldg(&Ain[index + (x) + ((y) * Nx) + ((z) * Nxy)])
+#define A_cur(x, y, z) *(&Ain[index + (x) + ((y) * Nx) + ((z) * Nxy)])
 #define A_next(x, y, z) Aout[index + (x) + ((y) * Nx) + ((z) * Nxy)]
         double div = 
           coef0 *  A_cur(0, 0, 0) +
@@ -38,7 +38,7 @@ stencil_step( int x0,  int x1,
 
         if (x < x1)
           A_next(0, 0, 0) = 2.0 * A_cur(0, 0, 0) - A_next(0, 0, 0) + 
-            __ldg(&vsq[index]) * div;
+            *(&vsq[index]) * div;
       }
 }
 
diff --git a/examples_ptx/stencil/stencil.ispc b/examples_ptx/stencil/stencil.ispc
index c4746868..05b86a7e 100644
--- a/examples_ptx/stencil/stencil.ispc
+++ b/examples_ptx/stencil/stencil.ispc
@@ -100,9 +100,15 @@ stencil_step(uniform int x0, uniform int x1,
     }
 }
 
+#ifdef __NVPTX__
 #define SPANX 32
-#define SPANY 2
-#define SPANZ 4
+#define SPANY 4
+#define SPANZ 8
+#else
+#define SPANX 64
+#define SPANY 4
+#define SPANZ 8
+#endif
 
 static task void
 stencil_step_task(uniform int x0, uniform int x1,