Allow constant expressions in pragma loop hints.

Previously loop hints such as #pragma loop vectorize_width(#) required a constant. This patch allows a constant expression to be used as well. Such as a non-type template parameter or an expression (2 * c + 1).

Reviewed by Richard Smith

llvm-svn: 219589

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/test/PCH/pragma-loop.cpp b/clang/test/PCH/pragma-loop.cpp
index 3eb1f60d96b..2640020f000 100644
--- a/clang/test/PCH/pragma-loop.cpp
+++ b/clang/test/PCH/pragma-loop.cpp
@@ -16,6 +16,8 @@
 // CHECK: #pragma unroll
 // CHECK: #pragma unroll (32)
 // CHECK: #pragma nounroll
+// CHECK: #pragma clang loop interleave_count(I)
+// CHECK: #pragma clang loop vectorize_width(V)
 
 #ifndef HEADER
 #define HEADER
@@ -81,6 +83,15 @@ public:
       i++;
     }
   }
+
+  template <int V, int I>
+  inline void run7(int *List, int Length) {
+#pragma clang loop vectorize_width(V)
+#pragma clang loop interleave_count(I)
+    for (int i = 0; i < Length; i++) {
+      List[i] = i;
+    }
+  }
 };
 #else
 
@@ -95,6 +106,7 @@ void test() {
   pt.run4(List, 100);
   pt.run5(List, 100);
   pt.run6(List, 100);
+  pt.run7<2, 4>(List, 100);
 }
 
 #endif