1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -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  %t0 = bitcast %struct.V* %var to i8*
22  call void @llvm.lifetime.start.p0i8(i64 28, i8* %t0) #3
23  %buf1 = getelementptr inbounds %struct.V, %struct.V* %var, i32 0, i32 0
24  %arrayidx = getelementptr inbounds [10 x i8], [10 x i8]* %buf1, i64 0, i64 1
25  %t1 = call i64 @llvm.objectsize.i64.p0i8(i8* %arrayidx, i1 false)
26  %conv = trunc i64 %t1 to i32
27  call void @llvm.lifetime.end.p0i8(i64 28, i8* %t0) #3
28  ret i32 %conv
29}
30
31; This used to crash while erasing instructions:
32; https://bugs.llvm.org/show_bug.cgi?id=43723
33
34define void @PR43723() {
35; CHECK-LABEL: @PR43723(
36; CHECK-NEXT:    ret void
37;
38  %tab = alloca [10 x i8], align 16
39  %t0 = bitcast [10 x i8]* %tab to i8*
40  call void @llvm.memset.p0i8.i64(i8* align 16 %t0, i8 9, i64 10, i1 false)
41  %t1 = call {}* @llvm.invariant.start.p0i8(i64 10, i8* align 16 %t0)
42  call void @llvm.invariant.end.p0i8({}* %t1, i64 10, i8* align 16 %t0)
43  ret void
44
45  uselistorder i8* %t0, { 1, 0, 2 }
46}
47
48define void @unknown_use_of_invariant_start({}** %p) {
49; CHECK-LABEL: @unknown_use_of_invariant_start(
50; CHECK-NEXT:    ret void
51;
52  %tab = alloca [10 x i8], align 16
53  %t0 = bitcast [10 x i8]* %tab to i8*
54  call void @llvm.memset.p0i8.i64(i8* align 16 %t0, i8 9, i64 10, i1 false)
55  %t1 = call {}* @llvm.invariant.start.p0i8(i64 10, i8* align 16 %t0)
56  call void @llvm.invariant.end.p0i8({}* %t1, i64 10, i8* align 16 %t0)
57  store {}* %t1, {}** %p
58  ret void
59}
60
61define {}* @minimal_invariant_start_use(i8 %x) {
62; CHECK-LABEL: @minimal_invariant_start_use(
63; CHECK-NEXT:    ret {}* undef
64;
65  %a = alloca i8
66  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
67  ret {}* %i
68}
69
70declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
71declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) #2
72declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
73declare void @llvm.memset.p0i8.i64(i8* nocapture writeonly, i8, i64, i1 immarg) #0
74declare {}* @llvm.invariant.start.p0i8(i64 immarg, i8* nocapture) #0
75declare void @llvm.invariant.end.p0i8({}*, i64 immarg, i8* nocapture) #0
76