1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: -p
2; RUN: opt < %s -indvars -S | FileCheck %s
3; RUN: opt < %s -passes=indvars -S | FileCheck %s
4target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
5
6declare i1 @foo(i8*, i8*)
7declare i1 @bar()
8declare i1 @baz()
9
10define i1 @kill_backedge_and_phis(i8* align 1 %lhs, i8* align 1 %rhs, i32 %len) {
11; CHECK-LABEL: @kill_backedge_and_phis(
12; CHECK-NEXT:  entry:
13; CHECK-NEXT:    %length_not_zero = icmp ne i32 %len, 0
14; CHECK-NEXT:    br i1 %length_not_zero, label %loop_preheader, label %exit
15; CHECK:       loop_preheader:
16; CHECK-NEXT:    br label %loop
17; CHECK:       loop:
18; CHECK-NEXT:    %result = call i1 @foo(i8* %lhs, i8* %rhs)
19; CHECK-NEXT:    br i1 %result, label %exiting_1, label %exit.loopexit
20; CHECK:       exiting_1:
21; CHECK-NEXT:    br i1 false, label %exiting_2, label %exit.loopexit
22; CHECK:       exiting_2:
23; CHECK-NEXT:    %bar_ret = call i1 @bar()
24; CHECK-NEXT:    br i1 %bar_ret, label %exit.loopexit, label %exiting_3
25; CHECK:       exiting_3:
26; CHECK-NEXT:    %baz_ret = call i1 @baz()
27; CHECK-NEXT:    %continue = icmp ne i32 1, %len
28; CHECK-NEXT:    %or.cond = select i1 %baz_ret, i1 %continue, i1 false
29; CHECK-NEXT:    br i1 %or.cond, label %loop, label %exit.loopexit
30; CHECK:       exit.loopexit:
31; CHECK-NEXT:    %val.ph = phi i1 [ %baz_ret, %exiting_3 ], [ %bar_ret, %exiting_2 ], [ false, %exiting_1 ], [ %result, %loop ]
32; CHECK-NEXT:    br label %exit
33; CHECK:       exit:
34; CHECK-NEXT:    %val = phi i1 [ false, %entry ], [ %val.ph, %exit.loopexit ]
35; CHECK-NEXT:    ret i1 %val
36;
37entry:
38  %length_not_zero = icmp ne i32 %len, 0
39  br i1 %length_not_zero, label %loop_preheader, label %exit
40
41loop_preheader:
42  br label %loop
43
44loop:
45  %iv = phi i32 [ 0, %loop_preheader ], [ %iv.next, %latch ]
46  %iv.wide = phi i64 [ 0, %loop_preheader ], [ %iv.wide.next, %latch ]
47  %iv.next = add i32 %iv, 1
48  %iv.wide.next = add i64 %iv.wide, 1
49  %left_ptr = getelementptr inbounds i8, i8* %lhs, i32 %iv
50  %right_ptr = getelementptr inbounds i8, i8* %rhs, i32 %iv
51  %result = call i1 @foo(i8* %left_ptr, i8* %right_ptr)
52  br i1 %result, label %exiting_1, label %exit
53
54exiting_1:
55  %iv.wide.is_not_zero = icmp ne i64 %iv.wide, 0
56  br i1 %iv.wide.is_not_zero, label %exiting_2, label %exit
57
58exiting_2:
59  %bar_ret = call i1 @bar()
60  br i1 %bar_ret, label %exit, label %exiting_3
61
62exiting_3:
63  %baz_ret = call i1 @baz()
64  br i1 %baz_ret, label %latch, label %exit
65
66latch:
67  %continue = icmp ne i32 %iv.next, %len
68  br i1 %continue, label %loop, label %exit
69
70exit:
71  %val = phi i1 [ %result, %loop ], [ %iv.wide.is_not_zero, %exiting_1 ],
72  [ %bar_ret, %exiting_2 ], [ %baz_ret, %exiting_3 ],
73  [ %baz_ret, %latch ], [ 0, %entry ]
74  ret i1 %val
75}
76
77define i1 @siblings(i8* align 1 %lhs, i8* align 1 %rhs, i32 %len) {
78; CHECK-LABEL: @siblings(
79; CHECK-NEXT:  entry:
80; CHECK-NEXT:    %length_not_zero = icmp ne i32 %len, 0
81; CHECK-NEXT:    br i1 %length_not_zero, label %weird_loop.preheader, label %exit
82; CHECK:       weird_loop.preheader:
83; CHECK-NEXT:    br label %weird_loop
84; CHECK:       weird_loop:
85; CHECK-NEXT:    %weird.iv = phi i32 [ %weird.iv.next, %weird_loop ], [ 0, %weird_loop.preheader ]
86; CHECK-NEXT:    %weird.iv.next = add i32 %weird.iv, 1
87; CHECK-NEXT:    %weird.cond = call i1 @bar()
88; CHECK-NEXT:    br i1 %weird.cond, label %weird_loop, label %loop.preheader
89; CHECK:       loop.preheader:
90; CHECK-NEXT:    %weird.iv.lcssa = phi i32 [ %weird.iv, %weird_loop ]
91; CHECK-NEXT:    br label %loop
92; CHECK:       loop:
93; CHECK-NEXT:    %iv.next = add i32 %weird.iv.lcssa, 1
94; CHECK-NEXT:    %left_ptr = getelementptr inbounds i8, i8* %lhs, i32 %weird.iv.lcssa
95; CHECK-NEXT:    %right_ptr = getelementptr inbounds i8, i8* %rhs, i32 %weird.iv.lcssa
96; CHECK-NEXT:    %result = call i1 @foo(i8* %left_ptr, i8* %right_ptr)
97; CHECK-NEXT:    br i1 %result, label %exiting_1, label %exit.loopexit
98; CHECK:       exiting_1:
99; CHECK-NEXT:    br i1 false, label %exiting_2, label %exit.loopexit
100; CHECK:       exiting_2:
101; CHECK-NEXT:    %bar_ret = call i1 @bar()
102; CHECK-NEXT:    br i1 %bar_ret, label %exit.loopexit, label %exiting_3
103; CHECK:       exiting_3:
104; CHECK-NEXT:    %baz_ret = call i1 @baz()
105; CHECK-NEXT:    %continue = icmp ne i32 %iv.next, %len
106; CHECK-NEXT:    %or.cond = select i1 %baz_ret, i1 %continue, i1 false
107; CHECK-NEXT:    br i1 %or.cond, label %loop, label %exit.loopexit
108; CHECK:       exit.loopexit:
109; CHECK-NEXT:    %val.ph = phi i1 [ %baz_ret, %exiting_3 ], [ %bar_ret, %exiting_2 ], [ false, %exiting_1 ], [ %result, %loop ]
110; CHECK-NEXT:    br label %exit
111; CHECK:       exit:
112; CHECK-NEXT:    %val = phi i1 [ false, %entry ], [ %val.ph, %exit.loopexit ]
113; CHECK-NEXT:    ret i1 %val
114;
115entry:
116  %length_not_zero = icmp ne i32 %len, 0
117  br i1 %length_not_zero, label %weird_loop, label %exit
118
119weird_loop:
120  %weird.iv = phi i32 [ 0, %entry ], [ %weird.iv.next, %weird_loop ]
121  %weird.iv.next = add i32 %weird.iv, 1
122  %weird.iv.wide = zext i32 %weird.iv to i64
123  %weird.cond = call i1 @bar()
124  br i1 %weird.cond, label %weird_loop, label %loop
125
126loop:
127  %iv = phi i32 [ %weird.iv, %weird_loop ], [ %iv.next, %latch ]
128  %iv.wide = phi i64 [ %weird.iv.wide, %weird_loop ], [ %iv.wide.next, %latch ]
129  %iv.next = add i32 %iv, 1
130  %iv.wide.next = add i64 %iv.wide, 1
131  %left_ptr = getelementptr inbounds i8, i8* %lhs, i32 %iv
132  %right_ptr = getelementptr inbounds i8, i8* %rhs, i32 %iv
133  %result = call i1 @foo(i8* %left_ptr, i8* %right_ptr)
134  br i1 %result, label %exiting_1, label %exit
135
136exiting_1:
137  %iv.wide.is_not_zero = icmp ne i64 %iv.wide, %weird.iv.wide
138  br i1 %iv.wide.is_not_zero, label %exiting_2, label %exit
139
140exiting_2:
141  %bar_ret = call i1 @bar()
142  br i1 %bar_ret, label %exit, label %exiting_3
143
144exiting_3:
145  %baz_ret = call i1 @baz()
146  br i1 %baz_ret, label %latch, label %exit
147
148latch:
149  %continue = icmp ne i32 %iv.next, %len
150  br i1 %continue, label %loop, label %exit
151
152exit:
153  %val = phi i1 [ %result, %loop ], [ %iv.wide.is_not_zero, %exiting_1 ],
154  [ %bar_ret, %exiting_2 ], [ %baz_ret, %exiting_3 ],
155  [ %baz_ret, %latch ], [ 0, %entry ]
156  ret i1 %val
157}
158