1; REQUIRES: asserts
2; RUN: opt -loop-unswitch -loop-unswitch-threshold 13 -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
3; RUN: opt -S -loop-unswitch -loop-unswitch-threshold 13 -verify-loop-info -verify-dom-info < %s | FileCheck %s
4
5; STATS: 1 loop-unswitch - Number of switches unswitched
6
7; ModuleID = '../llvm/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll'
8
9; CHECK:        %1 = icmp eq i32 %c, 1
10; CHECK-NEXT:   br i1 %1, label %.split.us, label %..split_crit_edge
11
12; CHECK:      ..split_crit_edge:                                ; preds = %0
13; CHECK-NEXT:   br label %.split
14
15; CHECK:      .split.us:                                        ; preds = %0
16; CHECK-NEXT:   br label %loop_begin.us
17
18; CHECK:      loop_begin.us:                                    ; preds = %loop_begin.backedge.us, %.split.us
19; CHECK:        switch i32 1, label %second_switch.us [
20; CHECK-NEXT:     i32 1, label %inc.us
21
22; CHECK:      second_switch.us:                                 ; preds = %loop_begin.us
23; CHECK-NEXT:   switch i32 %d, label %default.us [
24; CHECK-NEXT:     i32 1, label %inc.us
25; CHECK-NEXT:   ]
26
27; CHECK:      inc.us:                                           ; preds = %second_switch.us, %loop_begin.us
28; CHECK-NEXT:   call void @incf() [[NOR_NUW:#[0-9]+]]
29; CHECK-NEXT:   br label %loop_begin.backedge.us
30
31; CHECK:      .split:                                           ; preds = %..split_crit_edge
32; CHECK-NEXT:   br label %loop_begin
33
34; CHECK:      loop_begin:                                       ; preds = %loop_begin.backedge, %.split
35; CHECK:        switch i32 %c, label %second_switch [
36; CHECK-NEXT:     i32 1, label %loop_begin.inc_crit_edge
37; CHECK-NEXT:   ]
38
39; CHECK:      loop_begin.inc_crit_edge:                         ; preds = %loop_begin
40; CHECK-NEXT:   br i1 true, label %us-unreachable, label %inc
41
42; CHECK:      second_switch:                                    ; preds = %loop_begin
43; CHECK-NEXT:   switch i32 %d, label %default [
44; CHECK-NEXT:     i32 1, label %inc
45; CHECK-NEXT:   ]
46
47; CHECK:      inc:                                              ; preds = %loop_begin.inc_crit_edge, %second_switch
48; CHECK-NEXT:   call void @incf() [[NOR_NUW]]
49; CHECK-NEXT:   br label %loop_begin.backedge
50
51define i32 @test(i32* %var) {
52  %mem = alloca i32
53  store i32 2, i32* %mem
54  %c = load i32, i32* %mem
55  %d = load i32, i32* %mem
56
57  br label %loop_begin
58
59loop_begin:
60
61  %var_val = load i32, i32* %var
62
63  switch i32 %c, label %second_switch [
64      i32 1, label %inc
65  ]
66
67second_switch:
68  switch i32 %d, label %default [
69      i32 1, label %inc
70  ]
71
72inc:
73  call void @incf() noreturn nounwind
74  br label %loop_begin
75
76default:
77  br label %loop_begin
78
79loop_exit:
80  ret i32 0
81}
82
83declare void @incf() noreturn
84declare void @decf() noreturn
85
86; CHECK: attributes #0 = { noreturn }
87; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind }
88