1; RUN: llc < %s | FileCheck %s
2; RUN: llc -filetype=obj < %s | llvm-dwarfdump -debug-loc - | FileCheck %s --check-prefix=DWARF
3
4; Compile the following with -O1:
5
6; struct IntPair { int x, y; };
7; int g(void);
8; int bitpiece_spill() {
9;   struct IntPair o = {g(), 0};
10;   // Force o.x to spill
11;   asm volatile("" : : : "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp",
12;                "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15");
13;   return o.x;
14; }
15
16; CHECK-LABEL: bitpiece_spill:                         # @bitpiece_spill
17; CHECK:               callq   g
18; CHECK:               movl    %eax, [[offs:[0-9]+]](%rsp)          # 4-byte Spill
19; CHECK:               #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_LLVM_fragment 32 32] 0
20; CHECK:               #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_plus_uconst [[offs]], DW_OP_LLVM_fragment 0 32] [$rsp+0]
21; CHECK:               #APP
22; CHECK:               #NO_APP
23; CHECK:               movl    [[offs]](%rsp), %eax          # 4-byte Reload
24; CHECK:               retq
25
26; DWARF: .debug_loc contents:
27; DWARF-NEXT: 0x00000000:
28; DWARF-NEXT: {{.*}}: DW_OP_breg7 RSP+{{[0-9]+}}, DW_OP_piece 0x4, DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4
29
30; ModuleID = 't.c'
31source_filename = "t.c"
32target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
33target triple = "x86_64-pc-windows-msvc19.0.24210"
34
35%struct.IntPair = type { i32, i32 }
36
37; Function Attrs: nounwind uwtable
38define i32 @bitpiece_spill() local_unnamed_addr #0 !dbg !7 {
39entry:
40  tail call void @llvm.dbg.declare(metadata %struct.IntPair* undef, metadata !12, metadata !17), !dbg !18
41  %call = tail call i32 @g() #3, !dbg !19
42  tail call void @llvm.dbg.value(metadata i32 %call, metadata !12, metadata !20), !dbg !18
43  tail call void @llvm.dbg.value(metadata i32 0, metadata !12, metadata !21), !dbg !18
44  tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #3, !dbg !22, !srcloc !23
45  ret i32 %call, !dbg !24
46}
47
48; Function Attrs: nounwind readnone
49declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
50
51declare i32 @g() local_unnamed_addr #2
52
53; Function Attrs: nounwind readnone
54declare void @llvm.dbg.value(metadata, metadata, metadata) #1
55
56attributes #0 = { nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
57attributes #1 = { nounwind readnone }
58attributes #2 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
59attributes #3 = { nounwind }
60
61!llvm.dbg.cu = !{!0}
62!llvm.module.flags = !{!3, !4, !5}
63!llvm.ident = !{!6}
64
65!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
66!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm\5Cbuild")
67!2 = !{}
68!3 = !{i32 2, !"Dwarf Version", i32 4}
69!4 = !{i32 2, !"Debug Info Version", i32 3}
70!5 = !{i32 1, !"PIC Level", i32 2}
71!6 = !{!"clang version 4.0.0 "}
72!7 = distinct !DISubprogram(name: "bitpiece_spill", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !11)
73!8 = !DISubroutineType(types: !9)
74!9 = !{!10}
75!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
76!11 = !{!12}
77!12 = !DILocalVariable(name: "o", scope: !7, file: !1, line: 4, type: !13)
78!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "IntPair", file: !1, line: 1, size: 64, align: 32, elements: !14)
79!14 = !{!15, !16}
80!15 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !13, file: !1, line: 1, baseType: !10, size: 32, align: 32)
81!16 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !13, file: !1, line: 1, baseType: !10, size: 32, align: 32, offset: 32)
82!17 = !DIExpression()
83!18 = !DILocation(line: 4, column: 18, scope: !7)
84!19 = !DILocation(line: 4, column: 23, scope: !7)
85!20 = !DIExpression(DW_OP_LLVM_fragment, 0, 32)
86!21 = !DIExpression(DW_OP_LLVM_fragment, 32, 32)
87!22 = !DILocation(line: 6, column: 3, scope: !7)
88!23 = !{i32 138}
89!24 = !DILocation(line: 8, column: 3, scope: !7)
90