llvm-mirror/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll
Peter Collingbourne 5b721561aa DI: Reverse direction of subprogram -> function edge.
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
2015-11-05 22:03:56 +00:00

40 lines
2.1 KiB
LLVM

; RUN: opt -S -O3 < %s | FileCheck %s
; RUN: verify-uselistorder %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.2"
%struct.anon = type { i32, i32 }
%struct.test = type { i64, %struct.anon, %struct.test* }
@TestArrayPtr = global %struct.test* getelementptr inbounds ([10 x %struct.test], [10 x %struct.test]* @TestArray, i64 0, i64 3) ; <%struct.test**> [#uses=1]
@TestArray = common global [10 x %struct.test] zeroinitializer, align 32 ; <[10 x %struct.test]*> [#uses=2]
define i32 @main() nounwind readonly !dbg !1 {
%diff1 = alloca i64 ; <i64*> [#uses=2]
; CHECK: call void @llvm.dbg.value(metadata i64 72,
call void @llvm.dbg.declare(metadata i64* %diff1, metadata !0, metadata !DIExpression()), !dbg !DILocation(scope: !1)
store i64 72, i64* %diff1, align 8
%v1 = load %struct.test*, %struct.test** @TestArrayPtr, align 8 ; <%struct.test*> [#uses=1]
%v2 = ptrtoint %struct.test* %v1 to i64 ; <i64> [#uses=1]
%v3 = sub i64 %v2, ptrtoint ([10 x %struct.test]* @TestArray to i64) ; <i64> [#uses=1]
store i64 %v3, i64* %diff1, align 8
ret i32 4
}
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
!7 = !{!1}
!6 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 131941)", isOptimized: true, emissionKind: 0, file: !8, enums: !9, retainedTypes: !9, subprograms: !7)
!0 = !DILocalVariable(name: "c", line: 2, scope: !1, file: !2, type: !5)
!1 = distinct !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !8, scope: !2, type: !3)
!2 = !DIFile(filename: "/d/j/debug-test.c", directory: "/Volumes/Data/b")
!3 = !DISubroutineType(types: !4)
!4 = !{!5}
!5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!8 = !DIFile(filename: "/d/j/debug-test.c", directory: "/Volumes/Data/b")
!9 = !{i32 0}
!llvm.module.flags = !{!10}
!10 = !{i32 1, !"Debug Info Version", i32 3}