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3e7aea4dcc
Summary: We already have information about static alloca stack locations in our side table. Emitting instructions for them is inefficient, and it only happens when the address of the alloca has been materialized within the current block, which isn't often. Reviewers: aprantl, probinson, dblaikie Subscribers: jfb, dschuff, sbc100, jgravelle-google, hiraditya, llvm-commits, aheejin Differential Revision: https://reviews.llvm.org/D36117 llvm-svn: 309729
64 lines
2.6 KiB
LLVM
64 lines
2.6 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; RUN: llc < %s -filetype=obj | llvm-dwarfdump - -debug-dump=info | FileCheck %s --check-prefix=DWARF
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; This should use the frame index side table for allocas, not DBG_VALUE
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; instructions. For SDAG ISel, this test would see an SDNode materializing the
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; argument to escape_foo and we'd get DBG_VALUE MachineInstr.
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; CHECK-LABEL: use_dbg_declare:
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; CHECK-NOT: #DEBUG_VALUE
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; "<0x2> 91 00" means "fbreg uleb(0)", i.e. RSP+0.
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; DWARF: DW_TAG_variable
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; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (<0x2> 91 00 )
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; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}} = "o")
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; ModuleID = 't.c'
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source_filename = "t.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64--linux"
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%struct.Foo = type { i32 }
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; Function Attrs: noinline nounwind uwtable
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define void @use_dbg_declare() #0 !dbg !7 {
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entry:
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%o = alloca %struct.Foo, align 4
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call void @llvm.dbg.declare(metadata %struct.Foo* %o, metadata !10, metadata !15), !dbg !16
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call void @escape_foo(%struct.Foo* %o), !dbg !17
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ret void, !dbg !18
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @escape_foo(%struct.Foo*)
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attributes #0 = { noinline nounwind uwtable }
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attributes #1 = { nounwind readnone speculatable }
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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 6.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\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, !"wchar_size", i32 4}
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!6 = !{!"clang version 6.0.0 "}
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!7 = distinct !DISubprogram(name: "use_dbg_declare", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !DILocalVariable(name: "o", scope: !7, file: !1, line: 4, type: !11)
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!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, elements: !12)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !11, file: !1, line: 1, baseType: !14, size: 32)
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!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!15 = !DIExpression()
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!16 = !DILocation(line: 4, column: 14, scope: !7)
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!17 = !DILocation(line: 5, column: 3, scope: !7)
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!18 = !DILocation(line: 6, column: 1, scope: !7)
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