Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -1026,6 +1026,7 @@
   }
 
   PipelineTuningOptions PTO;
+  PTO.LoopUnrolling = CodeGenOpts.UnrollLoops;
   // For historical reasons, loop interleaving is set to mirror setting for loop
   // unrolling.
   PTO.LoopInterleaving = CodeGenOpts.UnrollLoops;
Index: test/CodeGen/loop-unroll.c
===================================================================
--- /dev/null
+++ test/CodeGen/loop-unroll.c
@@ -0,0 +1,55 @@
+// RUN: %clang -target x86_64 -S -c -O1 -funroll-loops -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-ENABLE-UNROLL
+// RUN: %clang -target x86_64 -S -c -O1 -fno-unroll-loops -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-DISABLE-UNROLL
+// RUN: %clang -target x86_64 -fexperimental-new-pass-manager -S -c -O1 -funroll-loops -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-ENABLE-UNROLL
+// RUN: %clang -target x86_64 -fexperimental-new-pass-manager -S -c -O1 -fno-unroll-loops -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-DISABLE-UNROLL
+
+// CHECK-ENABLE-UNROLL-LABEL: @for_test()
+// CHECK-ENABLE-UNROLL: br label %[[FORBODY:[a-z0-9_\.]+]]
+// CHECK-ENABLE-UNROLL: [[FORBODY]]:
+// CHECK-ENABLE-UNROLL: store
+// CHECK-ENABLE-UNROLL: store
+// CHECK-ENABLE-UNROLL: br i1 %[[EXITCOND:[a-z0-9_\.]+]], label %[[FORBODY5:[a-z0-9_\.]+]], label %[[FORBODY]]
+// CHECK-ENABLE-UNROLL: [[FORBODY5]]:
+// CHECK-ENABLE-UNROLL: fmul
+// CHECK-ENABLE-UNROLL: fadd
+// CHECK-ENABLE-UNROLL: store
+// CHECK-ENABLE-UNROLL: fmul
+// CHECK-ENABLE-UNROLL: fadd
+// CHECK-ENABLE-UNROLL: store
+// CHECK-ENABLE-UNROLL: fmul
+// CHECK-ENABLE-UNROLL: fadd
+// CHECK-ENABLE-UNROLL: store
+
+// CHECK-DISABLE-UNROLL-LABEL: @for_test()
+// CHECK-DISABLE-UNROLL: br label %[[FORBODY:[a-z0-9_\.]+]]
+// CHECK-DISABLE-UNROLL: [[FORBODY]]:
+// CHECK-DISABLE-UNROLL: store
+// CHECK-DISABLE-UNROLL-NOT: store
+// CHECK-DISABLE-UNROLL: br i1 %[[EXITCOND:[a-z0-9_\.]+]], label %[[FORBODY5:[a-z0-9_\.]+]], label %[[FORBODY]]
+// CHECK-DISABLE-UNROLL: [[FORBODY5]]:
+// CHECK-DISABLE-UNROLL: fmul
+// CHECK-DISABLE-UNROLL: fadd
+// CHECK-DISABLE-UNROLL: store
+// CHECK-DISABLE-UNROLL: fmul
+// CHECK-DISABLE-UNROLL: fadd
+// CHECK-DISABLE-UNROLL: store
+// CHECK-DISABLE-UNROLL-NOT: fmul
+// CHECK-DISABLE-UNROLL-NOT: fadd
+// CHECK-DISABLE-UNROLL-NOT: store
+
+#include <stdio.h>
+
+void for_test() {
+  double A[1000], B[1000];
+  int L = 500;
+  for (int i = 0; i < L; i++) {
+    A[i] = i;
+  }
+  for (int i = 0; i < L; i++) {
+    B[i] = A[i]*5;
+    B[i]++;
+    A[i] *= 7;
+    A[i]++;
+  }
+  printf("%lf %lf\n", A[0], B[0]);
+}