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:    %iv = phi i32 [ 0, %loop_preheader ], [ %iv.next, %exiting_3 ]
19; CHECK-NEXT:    %iv.wide = phi i64 [ 0, %loop_preheader ], [ %iv.wide.next, %exiting_3 ]
20; CHECK-NEXT:    %iv.next = add nuw nsw i32 %iv, 1
21; CHECK-NEXT:    %iv.wide.next = add nuw nsw i64 %iv.wide, 1
22; CHECK-NEXT:    %left_ptr = getelementptr inbounds i8, i8* %lhs, i32 %iv
23; CHECK-NEXT:    %right_ptr = getelementptr inbounds i8, i8* %rhs, i32 %iv
24; CHECK-NEXT:    %result = call i1 @foo(i8* %left_ptr, i8* %right_ptr)
25; CHECK-NEXT:    br i1 %result, label %exiting_1, label %exit.loopexit
26; CHECK:       exiting_1:
27; CHECK-NEXT:    %iv.wide.is_not_zero = icmp ne i64 %iv.wide, 0
28; CHECK-NEXT:    br i1 false, label %exiting_2, label %exit.loopexit
29; CHECK:       exiting_2:
30; CHECK-NEXT:    %bar_ret = call i1 @bar()
31; CHECK-NEXT:    br i1 %bar_ret, label %exit.loopexit, label %exiting_3
32; CHECK:       exiting_3:
33; CHECK-NEXT:    %baz_ret = call i1 @baz()
34; CHECK-NEXT:    %continue = icmp ne i32 %iv.next, %len
35; CHECK-NEXT:    %or.cond = select i1 %baz_ret, i1 %continue, i1 false
36; CHECK-NEXT:    br i1 %or.cond, label %loop, label %exit.loopexit
37; CHECK:       exit.loopexit:
38; CHECK-NEXT:    %val.ph = phi i1 [ %baz_ret, %exiting_3 ], [ %bar_ret, %exiting_2 ], [ %iv.wide.is_not_zero, %exiting_1 ], [ %result, %loop ]
39; CHECK-NEXT:    br label %exit
40; CHECK:       exit:
41; CHECK-NEXT:    %val = phi i1 [ false, %entry ], [ %val.ph, %exit.loopexit ]
42; CHECK-NEXT:    ret i1 %val
43;
44entry:
45  %length_not_zero = icmp ne i32 %len, 0
46  br i1 %length_not_zero, label %loop_preheader, label %exit
47
48loop_preheader:
49  br label %loop
50
51loop:
52  %iv = phi i32 [ 0, %loop_preheader ], [ %iv.next, %latch ]
53  %iv.wide = phi i64 [ 0, %loop_preheader ], [ %iv.wide.next, %latch ]
54  %iv.next = add i32 %iv, 1
55  %iv.wide.next = add i64 %iv.wide, 1
56  %left_ptr = getelementptr inbounds i8, i8* %lhs, i32 %iv
57  %right_ptr = getelementptr inbounds i8, i8* %rhs, i32 %iv
58  %result = call i1 @foo(i8* %left_ptr, i8* %right_ptr)
59  br i1 %result, label %exiting_1, label %exit
60
61exiting_1:
62  %iv.wide.is_not_zero = icmp ne i64 %iv.wide, 0
63  br i1 %iv.wide.is_not_zero, label %exiting_2, label %exit
64
65exiting_2:
66  %bar_ret = call i1 @bar()
67  br i1 %bar_ret, label %exit, label %exiting_3
68
69exiting_3:
70  %baz_ret = call i1 @baz()
71  br i1 %baz_ret, label %latch, label %exit
72
73latch:
74  %continue = icmp ne i32 %iv.next, %len
75  br i1 %continue, label %loop, label %exit
76
77exit:
78  %val = phi i1 [ %result, %loop ], [ %iv.wide.is_not_zero, %exiting_1 ],
79  [ %bar_ret, %exiting_2 ], [ %baz_ret, %exiting_3 ],
80  [ %baz_ret, %latch ], [ 0, %entry ]
81  ret i1 %val
82}
83