1; RUN: opt -mem2reg -instcombine %s -o - -S | FileCheck %s
2;
3; Test that a dbg.declare describing am alloca with volatile
4; load/stores is not lowered into a dbg.value, since the alloca won't
5; be elided anyway.
6;
7; Generated from:
8;
9; unsigned long long g();
10; void h(unsigned long long);
11; void f() {
12;   volatile unsigned long long v = g();
13;   if (v == 0)
14;     g();
15;   h(v);
16; }
17
18; CHECK: alloca i64
19; CHECK-NOT: call void @llvm.dbg.value
20; CHECK: call void @llvm.dbg.declare
21; CHECK-NOT: call void @llvm.dbg.value
22
23source_filename = "volatile.c"
24
25; Function Attrs: nounwind optsize ssp uwtable
26define void @f() local_unnamed_addr #0 !dbg !8 {
27  %1 = alloca i64, align 8
28  %2 = bitcast i64* %1 to i8*, !dbg !15
29  call void @llvm.lifetime.start.p0i8(i64 8, i8* %2), !dbg !15
30  call void @llvm.dbg.declare(metadata i64* %1, metadata !12, metadata !DIExpression()), !dbg !15
31  %3 = call i64 (...) @g() #4, !dbg !15
32  store volatile i64 %3, i64* %1, align 8, !dbg !15
33  %4 = load volatile i64, i64* %1, align 8, !dbg !15
34  %5 = icmp eq i64 %4, 0, !dbg !15
35  br i1 %5, label %6, label %8, !dbg !15
36
37; <label>:6:                                      ; preds = %0
38  %7 = call i64 (...) @g() #4, !dbg !15
39  br label %8, !dbg !15
40
41; <label>:8:                                      ; preds = %6, %0
42  %9 = load volatile i64, i64* %1, align 8, !dbg !15
43  call void @h(i64 %9) #4, !dbg !15
44  call void @llvm.lifetime.end.p0i8(i64 8, i8* %2), !dbg !15
45  ret void, !dbg !15
46}
47
48; Function Attrs: argmemonly nounwind
49declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
50
51; Function Attrs: nounwind readnone speculatable
52declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
53
54; Function Attrs: optsize
55declare i64 @g(...) local_unnamed_addr #3
56
57; Function Attrs: optsize
58declare void @h(i64) local_unnamed_addr #3
59
60; Function Attrs: argmemonly nounwind
61declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
62
63attributes #0 = { nounwind optsize ssp uwtable }
64attributes #1 = { argmemonly nounwind }
65attributes #2 = { nounwind readnone speculatable }
66attributes #3 = { optsize }
67attributes #4 = { optsize }
68
69!llvm.dbg.cu = !{!0}
70!llvm.module.flags = !{!3, !4}
71
72!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
73!1 = !DIFile(filename: "volatile.c", directory: "/")
74!3 = !{i32 2, !"Dwarf Version", i32 4}
75!4 = !{i32 2, !"Debug Info Version", i32 3}
76!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !11)
77!9 = !DISubroutineType(types: !10)
78!10 = !{null}
79!11 = !{!12}
80!12 = !DILocalVariable(name: "v", scope: !8, file: !1, line: 4, type: !13)
81!13 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !14)
82!14 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
83!15 = !DILocation(line: 4, column: 3, scope: !8)
84