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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
17 lines
593 B
LLVM
17 lines
593 B
LLVM
define weak i32 @foo(i32 %a, i32 %b) !dbg !3 {
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entry:
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%sum = call i32 @fastadd(i32 %a, i32 %b), !dbg !DILocation(line: 52, scope: !3)
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ret i32 %sum, !dbg !DILocation(line: 53, scope: !3)
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}
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declare i32 @fastadd(i32, i32)
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!llvm.dbg.cu = !{!1}
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, subprograms: !{!3}, emissionKind: 1)
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!2 = !DIFile(filename: "foo.c", directory: "/path/to/dir")
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!3 = distinct !DISubprogram(file: !2, scope: !2, line: 51, name: "foo", type: !4)
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!4 = !DISubroutineType(types: !{})
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