Disable SIMD vectorization in CUDA device code

diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index 7801a2397f442f89ad6879046c01ed80173c70ed..9da0d4818f2e2a8c366a8edd7a989cd49ed6176e 100644 (file)
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -114,7 +114,14 @@
  */
 
 #cmakedefine DEAL_II_WORDS_BIGENDIAN
-#define DEAL_II_COMPILER_VECTORIZATION_LEVEL @DEAL_II_COMPILER_VECTORIZATION_LEVEL@
+// We need to disable SIMD vectorization for CUDA device code.
+// Otherwise, nvcc compilers from version 9 on will emit an error message like:
+// "[...] contains a vector, which is not supported in device code"
+#ifdef __CUDA_ARCH__
+#  define DEAL_II_COMPILER_VECTORIZATION_LEVEL 0
+#else
+#  define DEAL_II_COMPILER_VECTORIZATION_LEVEL @DEAL_II_COMPILER_VECTORIZATION_LEVEL@
+#endif
 #define DEAL_II_OPENMP_SIMD_PRAGMA @DEAL_II_OPENMP_SIMD_PRAGMA@