xref: /llvm-project/llvm/test/Transforms/SCCP/replace-dereferenceable-ptr-with-undereferenceable.ll (revision 0991da36906bdb29b8f1030d5123bafb58fee79e) 
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -passes=ipsccp -S %s | FileCheck %s
3
4@y = common global [1 x i32] zeroinitializer, align 4
5@x = common global [1 x i32] zeroinitializer, align 4
6
7define i32 @eq_undereferenceable(ptr %p) {
8; CHECK-LABEL: @eq_undereferenceable(
9; CHECK-NEXT:  entry:
10; CHECK-NEXT:    store i32 1, ptr @y, align 4
11; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr [[P:%.*]], getelementptr inbounds (i32, ptr @x, i64 1)
12; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
13; CHECK:       if.then:
14; CHECK-NEXT:    store i32 2, ptr getelementptr inbounds (i32, ptr @x, i64 1), align 4
15; CHECK-NEXT:    br label [[IF_END]]
16; CHECK:       if.end:
17; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr @y, align 4
18; CHECK-NEXT:    ret i32 [[TMP0]]
19;
20entry:
21  store i32 1, ptr @y, align 4
22  %cmp = icmp eq ptr %p, getelementptr inbounds (i32, ptr @x, i64 1)
23  br i1 %cmp, label %if.then, label %if.end
24
25if.then:                                          ; preds = %entry
26  store i32 2, ptr %p, align 4
27  br label %if.end
28
29if.end:                                           ; preds = %if.then, %entry
30  %0 = load i32, ptr @y, align 4
31  ret i32 %0
32}
33
34
35define i32 @eq_dereferenceable(ptr %p) {
36; CHECK-LABEL: @eq_dereferenceable(
37; CHECK-NEXT:  entry:
38; CHECK-NEXT:    store i32 1, ptr @y, align 4
39; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr [[P:%.*]], @x
40; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
41; CHECK:       if.then:
42; CHECK-NEXT:    store i32 2, ptr @x, align 4
43; CHECK-NEXT:    br label [[IF_END]]
44; CHECK:       if.end:
45; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr @y, align 4
46; CHECK-NEXT:    ret i32 [[TMP0]]
47;
48entry:
49  store i32 1, ptr @y, align 4
50  %cmp = icmp eq ptr %p, @x
51  br i1 %cmp, label %if.then, label %if.end
52
53if.then:                                          ; preds = %entry
54  store i32 2, ptr %p, align 4
55  br label %if.end
56
57if.end:                                           ; preds = %if.then, %entry
58  %0 = load i32, ptr @y, align 4
59  ret i32 %0
60}
61
62define i1 @eq_undereferenceable_cmp_simp(ptr %p) {
63; CHECK-LABEL: @eq_undereferenceable_cmp_simp(
64; CHECK-NEXT:  entry:
65; CHECK-NEXT:    [[CMP_0:%.*]] = icmp eq ptr [[P:%.*]], getelementptr inbounds (i32, ptr @x, i64 1)
66; CHECK-NEXT:    br i1 [[CMP_0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
67; CHECK:       if.then:
68; CHECK-NEXT:    store i32 2, ptr getelementptr inbounds (i32, ptr @x, i64 1), align 4
69; CHECK-NEXT:    ret i1 true
70; CHECK:       if.end:
71; CHECK-NEXT:    ret i1 false
72;
73entry:
74  %cmp.0 = icmp eq ptr %p, getelementptr inbounds (i32, ptr @x, i64 1)
75  br i1 %cmp.0, label %if.then, label %if.end
76
77if.then:                                          ; preds = %entry
78  store i32 2, ptr %p, align 4
79  %cmp.1 = icmp eq ptr %p, getelementptr inbounds (i32, ptr @x, i64 1)
80  ret i1 %cmp.1
81
82if.end:                                           ; preds = %if.then, %entry
83  %cmp.2 = icmp eq ptr %p, getelementptr inbounds (i32, ptr @x, i64 1)
84  ret i1 %cmp.2
85}
86