1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -simplifycfg -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck %s
3
4declare i8 @next_char();
5
6define void @test_no_msan() {
7; CHECK-LABEL: @test_no_msan(
8; CHECK-NEXT:  entry:
9; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
10; CHECK:       while.body:
11; CHECK-NEXT:    br label [[WHILE_BODY_I:%.*]]
12; CHECK:       while.body.i:
13; CHECK-NEXT:    [[MAYBE_UNDEF:%.*]] = phi i1 [ undef, [[WHILE_BODY]] ], [ [[NEXT_MAYBE_UNDEF:%.*]], [[WHILE_BODY_I]] ]
14; CHECK-NEXT:    [[C:%.*]] = call fastcc signext i8 @next_char()
15; CHECK-NEXT:    [[C_10:%.*]] = icmp eq i8 [[C]], 10
16; CHECK-NEXT:    [[C_13:%.*]] = icmp eq i8 [[C]], 13
17; CHECK-NEXT:    [[C_10_OR_13:%.*]] = or i1 [[C_10]], [[C_13]]
18; CHECK-NEXT:    [[NEXT_MAYBE_UNDEF]] = or i1 [[MAYBE_UNDEF]], [[C_10_OR_13]]
19; CHECK-NEXT:    [[C_NOT_10_OR_13:%.*]] = xor i1 [[C_10_OR_13]], true
20; CHECK-NEXT:    br i1 [[C_NOT_10_OR_13]], label [[WHILE_BODY_I]], label [[WHILE_BODY_I_BREAK:%.*]]
21; CHECK:       while.body.i.break:
22; CHECK-NEXT:    br i1 [[MAYBE_UNDEF]], label [[WHILE_BODY]], label [[SWITCH_EARLY_TEST:%.*]]
23; CHECK:       switch.early.test:
24; CHECK-NEXT:    switch i8 [[C]], label [[RETURN:%.*]] [
25; CHECK-NEXT:    i8 13, label [[WHILE_BODY]]
26; CHECK-NEXT:    i8 10, label [[WHILE_BODY]]
27; CHECK-NEXT:    ]
28; CHECK:       return:
29; CHECK-NEXT:    ret void
30;
31
32entry:
33  br label %while.body
34
35while.body:
36  br label %while.body.i
37
38while.body.i:
39  %maybe_undef = phi i1 [ undef, %while.body ], [ %next_maybe_undef, %while.body.i ]
40  %c = call fastcc signext i8 @next_char()
41  %c_10 = icmp eq i8 %c, 10
42  %c_13 = icmp eq i8 %c, 13
43  %c_10_or_13 = or i1 %c_10, %c_13
44  %next_maybe_undef = or i1 %maybe_undef, %c_10_or_13
45  %c_not_10_or_13 = xor i1 %c_10_or_13, true
46  br i1 %c_not_10_or_13, label %while.body.i, label %while.body.i.break
47
48while.body.i.break:
49  ; NEXT_MAYBE_UNDEF is never undef if here
50  br i1 %next_maybe_undef, label %while.body, label %return
51
52
53return:
54  ret void
55}
56
57
58define void @test_msan() sanitize_memory {
59; CHECK-LABEL: @test_msan(
60; CHECK-NEXT:  entry:
61; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
62; CHECK:       while.body:
63; CHECK-NEXT:    br label [[WHILE_BODY_I:%.*]]
64; CHECK:       while.body.i:
65; CHECK-NEXT:    [[MAYBE_UNDEF:%.*]] = phi i1 [ undef, [[WHILE_BODY]] ], [ [[NEXT_MAYBE_UNDEF:%.*]], [[WHILE_BODY_I]] ]
66; CHECK-NEXT:    [[C:%.*]] = call fastcc signext i8 @next_char()
67; CHECK-NEXT:    [[C_10:%.*]] = icmp eq i8 [[C]], 10
68; CHECK-NEXT:    [[C_13:%.*]] = icmp eq i8 [[C]], 13
69; CHECK-NEXT:    [[C_10_OR_13:%.*]] = or i1 [[C_10]], [[C_13]]
70; CHECK-NEXT:    [[NEXT_MAYBE_UNDEF]] = or i1 [[MAYBE_UNDEF]], [[C_10_OR_13]]
71; CHECK-NEXT:    [[C_NOT_10_OR_13:%.*]] = xor i1 [[C_10_OR_13]], true
72; CHECK-NEXT:    br i1 [[C_NOT_10_OR_13]], label [[WHILE_BODY_I]], label [[WHILE_BODY_I_BREAK:%.*]]
73; CHECK:       while.body.i.break:
74; CHECK-NEXT:    br i1 [[NEXT_MAYBE_UNDEF]], label [[WHILE_BODY]], label [[RETURN:%.*]]
75; CHECK:       return:
76; CHECK-NEXT:    ret void
77;
78
79entry:
80  br label %while.body
81
82while.body:
83  br label %while.body.i
84
85while.body.i:
86  %maybe_undef = phi i1 [ undef, %while.body ], [ %next_maybe_undef, %while.body.i ]
87  %c = call fastcc signext i8 @next_char()
88  %c_10 = icmp eq i8 %c, 10
89  %c_13 = icmp eq i8 %c, 13
90  %c_10_or_13 = or i1 %c_10, %c_13
91  %next_maybe_undef = or i1 %maybe_undef, %c_10_or_13
92  %c_not_10_or_13 = xor i1 %c_10_or_13, true
93  br i1 %c_not_10_or_13, label %while.body.i, label %while.body.i.break
94
95while.body.i.break:
96  ; NEXT_MAYBE_UNDEF is never undef if here
97  br i1 %next_maybe_undef, label %while.body, label %return
98
99
100return:
101  ret void
102}
103