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5b721561aa
Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
37 lines
1.4 KiB
LLVM
37 lines
1.4 KiB
LLVM
; RUN: llc -mtriple=armv7-none-linux-gnueabihf < %s -o - | FileCheck %s
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; Function Attrs: nounwind
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define void @need_cfi_def_cfa_offset() #0 !dbg !3 {
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; CHECK-LABEL: need_cfi_def_cfa_offset:
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; CHECK: sub sp, sp, #4
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; CHECK: .cfi_def_cfa_offset 4
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entry:
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%Depth = alloca i32, align 4
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call void @llvm.dbg.declare(metadata i32* %Depth, metadata !9, metadata !10), !dbg !11
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store i32 2, i32* %Depth, align 4, !dbg !11
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ret void, !dbg !12
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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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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !{!3})
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!1 = !DIFile(filename: "file.c", directory: "/dir")
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!2 = !{}
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!3 = distinct !DISubprogram(name: "need_cfi_def_cfa_offset", scope: !1, file: !1, line: 1, type: !4, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: false, variables: !2)
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!4 = !DISubroutineType(types: !5)
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!5 = !{null}
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!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !DILocalVariable(name: "Depth", scope: !3, file: !1, line: 3, type: !6)
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!10 = !DIExpression()
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!11 = !DILocation(line: 3, column: 9, scope: !3)
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!12 = !DILocation(line: 7, column: 5, scope: !3)
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