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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
25 lines
1.3 KiB
LLVM
25 lines
1.3 KiB
LLVM
; RUN: llc -O0 %s -o /dev/null
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define void @CGRectStandardize(i32* sret %agg.result, i32* byval %rect) nounwind ssp !dbg !0 {
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entry:
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call void @llvm.dbg.declare(metadata i32* %rect, metadata !23, metadata !DIExpression()), !dbg !24
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ret void
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!27}
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!0 = distinct !DISubprogram(name: "CGRectStandardize", linkageName: "CGRectStandardize", line: 54, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !1, scope: null)
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!1 = !DIFile(filename: "GSFusedSilica.m", directory: "/Volumes/Data/Users/sabre/Desktop")
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!2 = distinct !DICompileUnit(language: DW_LANG_ObjC, producer: "clang version 2.9 (trunk 115292)", isOptimized: true, runtimeVersion: 1, emissionKind: 0, file: !25, enums: !26, retainedTypes: !26, subprograms: !{!0})
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!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "CGRect", line: 49, file: !25, baseType: null)
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!23 = !DILocalVariable(name: "rect", line: 53, arg: 2, scope: !0, file: !1, type: !5)
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!24 = !DILocation(line: 53, column: 33, scope: !0)
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!25 = !DIFile(filename: "GSFusedSilica.m", directory: "/Volumes/Data/Users/sabre/Desktop")
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!26 = !{}
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!27 = !{i32 1, !"Debug Info Version", i32 3}
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