--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/PCH/pragma-loop.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,114 @@
+// RUN: %clang_cc1 -emit-pch -o %t.a %s
+// RUN: %clang_cc1 -include-pch %t.a %s -ast-print -o - | FileCheck %s
+
+// CHECK: #pragma clang loop vectorize_width(4)
+// CHECK: #pragma clang loop interleave_count(8)
+// CHECK: #pragma clang loop unroll_count(16){{$}}
+// CHECK: #pragma clang loop vectorize(enable)
+// CHECK: #pragma clang loop interleave(disable)
+// CHECK: #pragma clang loop unroll(disable)
+// CHECK: #pragma clang loop distribute(enable)
+// CHECK: #pragma clang loop vectorize(disable)
+// CHECK: #pragma clang loop interleave(enable)
+// CHECK: #pragma clang loop unroll(full)
+// CHECK: #pragma clang loop distribute(disable)
+// FIXME: "#pragma unroll (enable)" is invalid and is not the input source.
+// CHECK: #pragma unroll (enable){{$}}
+// CHECK: #pragma unroll (32){{$}}
+// CHECK: #pragma nounroll{{$}}
+// CHECK: #pragma clang loop vectorize_width(V)
+// CHECK: #pragma clang loop interleave_count(I)
+
+#ifndef HEADER
+#define HEADER
+
+class pragma_test {
+public:
+  inline void run1(int *List, int Length) {
+    int i = 0;
+#pragma clang loop vectorize_width(4)
+#pragma clang loop interleave_count(8)
+#pragma clang loop unroll_count(16)
+    while (i < Length) {
+      List[i] = i;
+      i++;
+    }
+  }
+
+  inline void run2(int *List, int Length) {
+    int i = 0;
+#pragma clang loop vectorize(enable)
+#pragma clang loop interleave(disable)
+#pragma clang loop unroll(disable)
+#pragma clang loop distribute(enable)
+    while (i - 1 < Length) {
+      List[i] = i;
+      i++;
+    }
+  }
+
+  inline void run3(int *List, int Length) {
+    int i = 0;
+#pragma clang loop vectorize(disable)
+#pragma clang loop interleave(enable)
+#pragma clang loop unroll(full)
+#pragma clang loop distribute(disable)
+    while (i - 3 < Length) {
+      List[i] = i;
+      i++;
+    }
+  }
+
+  inline void run4(int *List, int Length) {
+    int i = 0;
+#pragma unroll
+    while (i - 3 < Length) {
+      List[i] = i;
+      i++;
+    }
+  }
+
+  inline void run5(int *List, int Length) {
+    int i = 0;
+#pragma unroll 32
+    while (i - 3 < Length) {
+      List[i] = i;
+      i++;
+    }
+  }
+
+  inline void run6(int *List, int Length) {
+    int i = 0;
+#pragma nounroll
+    while (i - 3 < Length) {
+      List[i] = i;
+      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
+
+void test() {
+  int List[100];
+
+  pragma_test pt;
+
+  pt.run1(List, 100);
+  pt.run2(List, 100);
+  pt.run3(List, 100);
+  pt.run4(List, 100);
+  pt.run5(List, 100);
+  pt.run6(List, 100);
+  pt.run7<2, 4>(List, 100);
+}
+
+#endif