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+; RUN: opt -regions -analyze < %s | FileCheck %s
+; RUN: opt -regions -stats < %s |& FileCheck -check-prefix=STAT %s
+; RUN: opt -regions -print-region-style=bb -analyze < %s |& FileCheck -check-prefix=BBIT %s
+; RUN: opt -regions -print-region-style=rn -analyze < %s |& FileCheck -check-prefix=RNIT %s
+
+define void @a_linear_impl_fig_1() nounwind {
+0:
+ br label %"1"
+1:
+ br label %"2"
+2:
+ br label %"3"
+3:
+ br i1 1, label %"13", label %"4"
+4:
+ br i1 1, label %"5", label %"1"
+5:
+ br i1 1, label %"8", label %"6"
+6:
+ br i1 1, label %"7", label %"4"
+7:
+ ret void
+8:
+ br i1 1, label %"9", label %"1"
+9:
+ br label %"10"
+10:
+ br i1 1, label %"12", label %"11"
+11:
+ br i1 1, label %"9", label %"8"
+13:
+ br i1 1, label %"2", label %"1"
+12:
+ switch i32 0, label %"1" [ i32 0, label %"9"
+ i32 1, label %"8"]
+}
+
+; CHECK-NOT: =>
+; CHECK: [0] 0 => <Function Return>
+; CHECK-NEXT: [1] 1 => 7
+; CHECK-NEXT: [2] 1 => 4
+; CHECK-NEXT: [2] 8 => 1
+
+; STAT: 4 region - The # of regions
+; STAT: 1 region - The # of simple regions
+
+; BBIT: 0, 1, 2, 3, 13, 4, 5, 8, 9, 10, 12, 11, 6, 7,
+; BBIT: 1, 2, 3, 13, 4, 5, 8, 9, 10, 12, 11, 6,
+; BBIT: 1, 2, 3, 13,
+; BBIT: 8, 9, 10, 12, 11,
+
+; RNIT: 0, 1 => 7, 7,
+; RNIT: 1 => 4, 4, 5, 8 => 1, 6,
+; RNIT: 1, 2, 3, 13,
+; RNIT: 8, 9, 10, 12, 11,