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46975d210c
Normalize common kinds of DWARF sub-expressions to make debug info encoding a bit more compact: DW_OP_constu [X < 32] -> DW_OP_litX DW_OP_constu [all ones] -> DW_OP_lit0, DW_OP_not (64-bit only) Differential revision: https://reviews.llvm.org/D51640 llvm-svn: 341457
90 lines
4.7 KiB
LLVM
90 lines
4.7 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; RUN: llc -filetype=obj < %s | llvm-dwarfdump -debug-loc - | FileCheck %s --check-prefix=DWARF
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; Compile the following with -O1:
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; struct IntPair { int x, y; };
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; int g(void);
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; int bitpiece_spill() {
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; struct IntPair o = {g(), 0};
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; // Force o.x to spill
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; asm volatile("" : : : "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp",
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; "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15");
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; return o.x;
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; }
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; CHECK-LABEL: bitpiece_spill: # @bitpiece_spill
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; CHECK: callq g
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; CHECK: movl %eax, [[offs:[0-9]+]](%rsp) # 4-byte Spill
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; CHECK: #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_LLVM_fragment 32 32] 0
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; CHECK: #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_plus_uconst [[offs]], DW_OP_LLVM_fragment 0 32] [$rsp+0]
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; CHECK: #APP
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; CHECK: #NO_APP
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; CHECK: movl [[offs]](%rsp), %eax # 4-byte Reload
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; CHECK: retq
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; DWARF: .debug_loc contents:
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; DWARF-NEXT: 0x00000000:
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; DWARF-NEXT: {{.*}}: DW_OP_breg7 RSP+{{[0-9]+}}, DW_OP_piece 0x4, DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4
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; ModuleID = 't.c'
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source_filename = "t.c"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.0.24210"
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%struct.IntPair = type { i32, i32 }
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; Function Attrs: nounwind uwtable
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define i32 @bitpiece_spill() local_unnamed_addr #0 !dbg !7 {
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entry:
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tail call void @llvm.dbg.declare(metadata %struct.IntPair* undef, metadata !12, metadata !17), !dbg !18
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%call = tail call i32 @g() #3, !dbg !19
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tail call void @llvm.dbg.value(metadata i32 %call, metadata !12, metadata !20), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 0, metadata !12, metadata !21), !dbg !18
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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
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ret i32 %call, !dbg !24
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare i32 @g() local_unnamed_addr #2
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #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" }
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attributes #1 = { nounwind readnone }
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attributes #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" }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm\5Cbuild")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"PIC Level", i32 2}
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!6 = !{!"clang version 4.0.0 "}
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!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)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "o", scope: !7, file: !1, line: 4, type: !13)
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!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "IntPair", file: !1, line: 1, size: 64, align: 32, elements: !14)
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!14 = !{!15, !16}
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !13, file: !1, line: 1, baseType: !10, size: 32, align: 32)
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!16 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !13, file: !1, line: 1, baseType: !10, size: 32, align: 32, offset: 32)
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!17 = !DIExpression()
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!18 = !DILocation(line: 4, column: 18, scope: !7)
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!19 = !DILocation(line: 4, column: 23, scope: !7)
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!20 = !DIExpression(DW_OP_LLVM_fragment, 0, 32)
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!21 = !DIExpression(DW_OP_LLVM_fragment, 32, 32)
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!22 = !DILocation(line: 6, column: 3, scope: !7)
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!23 = !{i32 138}
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!24 = !DILocation(line: 8, column: 3, scope: !7)
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