[CUDA] Print an error if you try to compile with < sm_30 on CUDA 9.

Summary:
CUDA 9's minimum sm is sm_30.

Ideally we should also make sm_30 the default when compiling with CUDA
9, but that seems harder than it should be.

Subscribers: sanjoy

Differential Revision: https://reviews.llvm.org/D39109

llvm-svn: 316611

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/lib/Basic/Cuda.cpp b/clang/lib/Basic/Cuda.cpp
index 3a5297b0c64..58b99a3b58c 100644
--- a/clang/lib/Basic/Cuda.cpp
+++ b/clang/lib/Basic/Cuda.cpp
@@ -180,4 +180,16 @@ CudaVersion MinVersionForCudaArch(CudaArch A) {
   llvm_unreachable("invalid enum");
 }
 
+CudaVersion MaxVersionForCudaArch(CudaArch A) {
+  switch (A) {
+  case CudaArch::UNKNOWN:
+    return CudaVersion::UNKNOWN;
+  case CudaArch::SM_20:
+  case CudaArch::SM_21:
+    return CudaVersion::CUDA_80;
+  default:
+    return CudaVersion::LATEST;
+  }
+}
+
 } // namespace clang