[Pragma] Clear loop distribution attribute between loops

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@279608 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGLoopInfo.cpp

@@ -112,6 +112,7 @@ void LoopAttributes::clear() {
   UnrollCount = 0;
   VectorizeEnable = LoopAttributes::Unspecified;
   UnrollEnable = LoopAttributes::Unspecified;
+  DistributeEnable = LoopAttributes::Unspecified;
 }
 
 LoopInfo::LoopInfo(BasicBlock *Header, const LoopAttributes &Attrs,

test/CodeGenCXX/pragma-loop-distribute.cpp

@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -o - %s | FileCheck %s
+
+void while_test(int *List, int Length, int *List2, int Length2) {
+  // CHECK: define {{.*}} @_Z10while_test
+  int i = 0;
+
+#pragma clang loop distribute(enable)
+  while (i < Length) {
+    // CHECK: br label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
+    List[i] = i * 2;
+    i++;
+  }
+
+  i = 0;
+  while (i < Length2) {
+    // CHECK-NOT: br label {{.*}}, !llvm.loop
+    List2[i] = i * 2;
+    i++;
+  }
+}
+
+// CHECK: ![[LOOP_1]] = distinct !{![[LOOP_1]], ![[DISTRIBUTE_ENABLE:.*]]}
+// CHECK: ![[DISTRIBUTE_ENABLE]] = !{!"llvm.loop.distribute.enable", i1 true}