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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
29 lines
1.1 KiB
LLVM
29 lines
1.1 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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@.str = private constant [3 x i8] c"%c\00"
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define void @foo() nounwind ssp !dbg !0 {
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;CHECK: call i32 @putchar{{.+}} !dbg
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%1 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i32 0, i32 0), i32 97), !dbg !5
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ret void, !dbg !7
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}
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declare i32 @printf(i8*, ...)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10}
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!llvm.dbg.sp = !{!0}
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!0 = distinct !DISubprogram(name: "foo", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !8, scope: !1, type: !3)
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!1 = !DIFile(filename: "m.c", directory: "/private/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang", isOptimized: true, emissionKind: 0, file: !8, enums: !{}, retainedTypes: !{}, subprograms: !9)
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!5 = !DILocation(line: 5, column: 2, scope: !6)
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!6 = distinct !DILexicalBlock(line: 4, column: 12, file: !8, scope: !0)
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!7 = !DILocation(line: 6, column: 1, scope: !6)
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!8 = !DIFile(filename: "m.c", directory: "/private/tmp")
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!9 = !{!0}
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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