1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -instsimplify -S | FileCheck %s
3
4define i64 @test0(i64 %x) {
5; CHECK-LABEL: @test0(
6; CHECK-NEXT:  start:
7; CHECK-NEXT:    [[A:%.*]] = icmp eq i64 [[X:%.*]], 0
8; CHECK-NEXT:    br i1 [[A]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
9; CHECK:       non_zero:
10; CHECK-NEXT:    br i1 false, label [[UNREACHABLE:%.*]], label [[EXIT]]
11; CHECK:       unreachable:
12; CHECK-NEXT:    br label [[EXIT]]
13; CHECK:       exit:
14; CHECK-NEXT:    [[C:%.*]] = phi i64 [ 0, [[START:%.*]] ], [ 1, [[NON_ZERO]] ], [ 2, [[UNREACHABLE]] ]
15; CHECK-NEXT:    ret i64 [[C]]
16;
17start:
18  %a = icmp eq i64 %x, 0
19  br i1 %a, label %exit, label %non_zero
20
21non_zero:
22  %b = icmp eq i64 %x, 0
23  br i1 %b, label %unreachable, label %exit
24
25unreachable:
26  br label %exit
27
28exit:
29  %c = phi i64 [ 0, %start ], [ 1, %non_zero ], [ 2, %unreachable ]
30  ret i64 %c
31}
32
33define i64 @test1(i64 %x) {
34; CHECK-LABEL: @test1(
35; CHECK-NEXT:  start:
36; CHECK-NEXT:    [[A:%.*]] = icmp eq i64 [[X:%.*]], 0
37; CHECK-NEXT:    br i1 [[A]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
38; CHECK:       non_zero:
39; CHECK-NEXT:    br i1 true, label [[EXIT]], label [[UNREACHABLE:%.*]]
40; CHECK:       unreachable:
41; CHECK-NEXT:    br label [[EXIT]]
42; CHECK:       exit:
43; CHECK-NEXT:    [[C:%.*]] = phi i64 [ 0, [[START:%.*]] ], [ [[X]], [[NON_ZERO]] ], [ 0, [[UNREACHABLE]] ]
44; CHECK-NEXT:    ret i64 [[C]]
45;
46start:
47  %a = icmp eq i64 %x, 0
48  br i1 %a, label %exit, label %non_zero
49
50non_zero:
51  %b = icmp ugt i64 %x, 0
52  br i1 %b, label %exit, label %unreachable
53
54unreachable:
55  br label %exit
56
57exit:
58  %c = phi i64 [ 0, %start ], [ %x, %non_zero ], [ 0, %unreachable ]
59  ret i64 %c
60}
61
62define i1 @test2(i64 %x, i1 %y) {
63; CHECK-LABEL: @test2(
64; CHECK-NEXT:  start:
65; CHECK-NEXT:    [[A:%.*]] = icmp eq i64 [[X:%.*]], 0
66; CHECK-NEXT:    br i1 [[A]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
67; CHECK:       non_zero:
68; CHECK-NEXT:    br i1 [[Y:%.*]], label [[ONE:%.*]], label [[TWO:%.*]]
69; CHECK:       one:
70; CHECK-NEXT:    br label [[MAINBLOCK:%.*]]
71; CHECK:       two:
72; CHECK-NEXT:    br label [[MAINBLOCK]]
73; CHECK:       mainblock:
74; CHECK-NEXT:    br label [[EXIT]]
75; CHECK:       exit:
76; CHECK-NEXT:    [[RES:%.*]] = phi i1 [ false, [[MAINBLOCK]] ], [ true, [[START:%.*]] ]
77; CHECK-NEXT:    ret i1 [[RES]]
78;
79start:
80  %a = icmp eq i64 %x, 0
81  br i1 %a, label %exit, label %non_zero
82
83non_zero:
84  br i1 %y, label %one, label %two
85
86one:
87  br label %mainblock
88
89two:
90  br label %mainblock
91
92mainblock:
93  %p = phi i64 [ %x, %one ], [ 42, %two ]
94  %cmp = icmp eq i64 %p, 0
95  br label %exit
96
97exit:
98  %res = phi i1 [ %cmp, %mainblock ], [ 1, %start ]
99  ret i1 %res
100}
101