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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
30 lines
977 B
LLVM
30 lines
977 B
LLVM
; RUN: opt < %s -argpromotion -S | FileCheck %s
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declare void @sink(i32)
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; CHECK: define internal void @test({{.*}} !dbg [[SP:![0-9]+]]
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define internal void @test(i32** %X) !dbg !2 {
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%1 = load i32*, i32** %X, align 8
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%2 = load i32, i32* %1, align 8
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call void @sink(i32 %2)
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ret void
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}
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define void @caller(i32** %Y) {
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; CHECK: call void @test(i32 %
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call void @test(i32** %Y)
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ret void
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}
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; CHECK: [[SP]] = distinct !DISubprogram(name: "test",
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!llvm.module.flags = !{!0}
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!llvm.dbg.cu = !{!3}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = !DILocation(line: 8, scope: !2)
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!2 = distinct !DISubprogram(name: "test", line: 3, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, scope: null)
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!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 2, file: !5, subprograms: !4)
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!4 = !{!2}
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!5 = !DIFile(filename: "test.c", directory: "")
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