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93d80a543f
When sampleFDO is enabled, people may expect they can use -fno-profile-sample-use to opt-out using sample profile for a certain file. That could be either for debugging purpose or for performance tuning purpose. However, when thinlto is enabled, if a function in file A compiled with -fno-profile-sample-use is imported to another file B compiled with -fprofile-sample-use, the inlined copy of the function in file B may still get its profile annotated. The inconsistency may even introduce profile unused warning because if the target is not compiled with explicit debug information flag, the function in file A won't have its debug information enabled (debug information will be enabled implicitly only when -fprofile-sample-use is used). After it is imported into file B which is compiled with -fprofile-sample-use, profile annotation for the outline copy of the function will fail because the function has no debug information, and that will trigger profile unused warning. We add a new attribute use-sample-profile to control whether a function will use its sample profile no matter for its outline or inline copies. That will make the behavior of -fno-profile-sample-use consistent. Differential Revision: https://reviews.llvm.org/D79959
49 lines
1.7 KiB
LLVM
49 lines
1.7 KiB
LLVM
; Test that LTO pipeline loads profile.
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;
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; RUN: opt < %s -o %t.bc
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; Run the old pm LTO pipeline.
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; RUN: llvm-lto2 run -o %t.out %t.bc -save-temps \
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; RUN: -r %t.bc,foo,px -r %t.bc,bar,x \
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; RUN: -lto-sample-profile-file=%S/Inputs/load-sample-prof.prof
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; RUN: llvm-dis %t.out.0.4.opt.bc -o - | FileCheck %s
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; Run the new pm LTO pipeline.
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; RUN: llvm-lto2 run -o %t.out %t.bc -save-temps -use-new-pm \
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; RUN: -r %t.bc,foo,px -r %t.bc,bar,x \
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; RUN: -lto-sample-profile-file=%S/Inputs/load-sample-prof.prof
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; RUN: llvm-dis %t.out.0.4.opt.bc -o - | FileCheck %s
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; Make sure profile information is attached.
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; CHECK: !prof
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @foo() #0 !dbg !7 {
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entry:
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tail call void @bar(), !dbg !10
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ret void, !dbg !11
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}
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declare void @bar() local_unnamed_addr
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attributes #0 = {"local_unnamed_addr" "use-sample-profile"}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 6.0.0 "}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !DILocation(line: 4, column: 5, scope: !7)
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!11 = !DILocation(line: 5, column: 1, scope: !7)
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