Add test case for PR12377, it was fixed by r194116.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194147 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/IndVarSimplify/loop_evaluate_1.ll

@@ -1,8 +1,9 @@
-; RUN: opt < %s -indvars -loop-deletion -simplifycfg -S | not grep br
-;
-; Testcase distilled from 256.bzip2
+; RUN: opt < %s -indvars -loop-deletion -simplifycfg -S | FileCheck %s
 
-define i32 @main() {
+; Testcase distilled from 256.bzip2
+; CHECK-LABEL: @test1
+; CHECK-NOT: br
+define i32 @test1() {
 entry:
         br label %loopentry
 
@@ -19,3 +20,28 @@ loopexit:               ; preds = %loopentry
         ret i32 %tmp.2
 }
 
+
+; PR12377
+; CHECK-LABEL: @test2
+; CHECK: [[VAR1:%.+]] = add i32 %arg, -11
+; CHECK: [[VAR2:%.+]] = lshr i32 [[VAR1]], 1
+; CHECK: [[VAR3:%.+]] = add i32 [[VAR2]], 1
+; CHECK: [[VAR4:%.+]] = phi i32 [ 0, %bb ], [ [[VAR3]], %bb1.preheader ]
+; CHECK: ret i32 [[VAR4]]
+define i32 @test2(i32 %arg) {
+bb:
+  %tmp = icmp ugt i32 %arg, 10
+  br i1 %tmp, label %bb1, label %bb7
+
+bb1:                                              ; preds = %bb1, %bb
+  %tmp2 = phi i32 [ %tmp5, %bb1 ], [ 0, %bb ]
+  %tmp3 = phi i32 [ %tmp4, %bb1 ], [ %arg, %bb ]
+  %tmp4 = add i32 %tmp3, -2
+  %tmp5 = add i32 %tmp2, 1
+  %tmp6 = icmp ugt i32 %tmp4, 10
+  br i1 %tmp6, label %bb1, label %bb7
+
+bb7:                                              ; preds = %bb1, %bb
+  %tmp8 = phi i32 [ 0, %bb ], [ %tmp5, %bb1 ]
+  ret i32 %tmp8
+}