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4a1cdc1ae5
This can be used to preserve profiling information across codebase changes that have widespread impact on mangled names, but across which most profiling data should still be usable. For example, when switching from libstdc++ to libc++, or from the old libstdc++ ABI to the new ABI, or even from a 32-bit to a 64-bit build. The user can provide a remapping file specifying parts of mangled names that should be treated as equivalent (eg, std::__1 should be treated as equivalent to std::__cxx11), and profile data will be treated as applying to a particular function if its name is equivalent to the name of a function in the profile data under the provided equivalences. See the documentation change for a description of how this is configured. Remapping is supported for both sample-based profiling and instruction profiling. We do not support remapping indirect branch target information, but all other profile data should be remapped appropriately. Support is only added for the new pass manager. If someone wants to also add support for this for the old pass manager, doing so should be straightforward. This is the LLVM side of Clang r344199. Reviewers: davidxl, tejohnson, dlj, erik.pilkington Subscribers: mehdi_amini, steven_wu, dexonsmith, llvm-commits Differential Revision: https://reviews.llvm.org/D51249 llvm-svn: 344200
61 lines
2.1 KiB
LLVM
61 lines
2.1 KiB
LLVM
; RUN: opt %s -passes=sample-profile -sample-profile-file=%S/Inputs/remap.prof -sample-profile-remapping-file=%S/Inputs/remap.map | opt -analyze -branch-prob | FileCheck %s
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; Reduced from branch.ll
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declare i1 @foo()
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define void @_ZN3foo3barERKN1M1XINS_6detail3quxEEE() !dbg !2 {
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; CHECK: Printing analysis 'Branch Probability Analysis' for function '_ZN3foo3barERKN1M1XINS_6detail3quxEEE':
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entry:
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%cmp = call i1 @foo(), !dbg !6
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br i1 %cmp, label %if.then, label %if.end
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; CHECK: edge entry -> if.then probability is 0x4ccf6b16 / 0x80000000 = 60.01%
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; CHECK: edge entry -> if.end probability is 0x333094ea / 0x80000000 = 39.99%
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if.then:
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br label %return
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if.end:
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%cmp1 = call i1 @foo(), !dbg !7
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br i1 %cmp1, label %if.then.2, label %if.else
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; CHECK: edge if.end -> if.then.2 probability is 0x6652c748 / 0x80000000 = 79.94%
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; CHECK: edge if.end -> if.else probability is 0x19ad38b8 / 0x80000000 = 20.06%
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if.then.2:
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call i1 @foo(), !dbg !8
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br label %for.cond
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for.cond:
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%cmp5 = call i1 @foo()
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br i1 %cmp5, label %for.body, label %for.end, !prof !9
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; CHECK: edge for.cond -> for.body probability is 0x73333333 / 0x80000000 = 90.00%
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; CHECK: edge for.cond -> for.end probability is 0x0ccccccd / 0x80000000 = 10.00%
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for.body:
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br label %for.cond
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for.end:
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br label %return
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if.else:
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br label %return
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return:
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ret void
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!4, !5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "foo++", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !{}, retainedTypes: !{})
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!1 = !DIFile(filename: "test.cc", directory: "/foo/bar")
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!2 = distinct !DISubprogram(name: "_ZN3foo3barERKN1M1XINS_6detail3quxEEE", scope: !1, file: !1, line: 4, type: !3, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !{})
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!3 = !DISubroutineType(types: !{})
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!4 = !{i32 2, !"Dwarf Version", i32 4}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = !DILocation(line: 5, column: 8, scope: !2)
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!7 = !DILocation(line: 8, column: 6, scope: !2)
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!8 = !DILocation(line: 10, column: 11, scope: !2)
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!9 = !{!"branch_weights", i32 90, i32 10}
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