xref: /llvm-project/llvm/test/Transforms/InstCombine/builtin-object-size-ptr.ll (revision 4ab40eca080965c65802710e39adbb78c4ce7bde) 
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -passes=instcombine -S < %s | FileCheck %s
3
4; int foo() {
5; struct V { char buf1[10];
6;            int b;
7;            char buf2[10];
8;           } var;
9;
10;           char *p = &var.buf1[1];
11;           return __builtin_object_size (p, 0);
12; }
13
14%struct.V = type { [10 x i8], i32, [10 x i8] }
15
16define i32 @foo() #0 {
17; CHECK-LABEL: @foo(
18; CHECK-NEXT:    ret i32 27
19;
20  %var = alloca %struct.V, align 4
21  call void @llvm.lifetime.start.p0(i64 28, ptr %var) #3
22  %arrayidx = getelementptr inbounds [10 x i8], ptr %var, i64 0, i64 1
23  %t1 = call i64 @llvm.objectsize.i64.p0(ptr %arrayidx, i1 false)
24  %conv = trunc i64 %t1 to i32
25  call void @llvm.lifetime.end.p0(i64 28, ptr %var) #3
26  ret i32 %conv
27}
28
29; This used to crash while erasing instructions:
30; https://bugs.llvm.org/show_bug.cgi?id=43723
31
32define void @PR43723() {
33; CHECK-LABEL: @PR43723(
34; CHECK-NEXT:    ret void
35;
36  %tab = alloca [10 x i8], align 16
37  call void @llvm.memset.p0.i64(ptr align 16 %tab, i8 9, i64 10, i1 false)
38  %t1 = call ptr @llvm.invariant.start.p0(i64 10, ptr align 16 %tab)
39  call void @llvm.invariant.end.p0(ptr %t1, i64 10, ptr align 16 %tab)
40  ret void
41
42  uselistorder ptr %tab, { 1, 0, 2 }
43}
44
45define void @unknown_use_of_invariant_start(ptr %p) {
46; CHECK-LABEL: @unknown_use_of_invariant_start(
47; CHECK-NEXT:    ret void
48;
49  %tab = alloca [10 x i8], align 16
50  call void @llvm.memset.p0.i64(ptr align 16 %tab, i8 9, i64 10, i1 false)
51  %t1 = call ptr @llvm.invariant.start.p0(i64 10, ptr align 16 %tab)
52  call void @llvm.invariant.end.p0(ptr %t1, i64 10, ptr align 16 %tab)
53  store ptr %t1, ptr %p
54  ret void
55}
56
57define ptr @minimal_invariant_start_use(i8 %x) {
58; CHECK-LABEL: @minimal_invariant_start_use(
59; CHECK-NEXT:    ret ptr poison
60;
61  %a = alloca i8
62  %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %a)
63  ret ptr %i
64}
65
66declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #1
67declare i64 @llvm.objectsize.i64.p0(ptr, i1) #2
68declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #1
69declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #0
70declare ptr @llvm.invariant.start.p0(i64 immarg, ptr nocapture) #0
71declare void @llvm.invariant.end.p0(ptr, i64 immarg, ptr nocapture) #0
72