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_constu 0x0, 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" "no-frame-pointer-elim"="false" "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" "no-frame-pointer-elim"="false" "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