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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
27 lines
963 B
LLVM
27 lines
963 B
LLVM
; RUN: llc -debug -dag-dump-verbose < %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; CHECK: t{{[0-9]+}}: i32 = Constant<-1>test.c:4:5
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define i32 @main() !dbg !4 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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ret i32 -1, !dbg !10
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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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: "test.c", directory: "/home/user/clang-llvm/build")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !DILocation(line: 4, column: 5, scope: !4)
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