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8fa16cc628
When enable CSPGO for ThinLTO, there are profile cfg mismatch warnings that will cause lld-link errors (with /WX) due to source changes (e.g. `#if` code runs for profile generation but not for profile use) To disable it we have to use an internal "/mllvm:-no-pgo-warn-mismatch" option. In contrast clang uses option ”-Wno-backend-plugin“ to avoid such warnings and gcc has an explicit "-Wno-coverage-mismatch" option. Add "lto-pgo-warn-mismatch" option to lld COFF/ELF to help turn on/off the profile mismatch warnings explicitly when build with ThinLTO and CSPGO. Differential Revision: https://reviews.llvm.org/D104431
71 lines
2.2 KiB
LLVM
71 lines
2.2 KiB
LLVM
; REQUIRES: x86
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; RUN: rm -rf %t && split-file %s %t
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; RUN: opt -module-summary %t/a.ll -o %t/a.bc
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; RUN: llvm-profdata merge %t/cs.proftext -o %t/cs.profdata
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; Ensure lld generates warnings for profile cfg mismatch.
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; RUN: lld-link /dll /noentry /export:f /lto-cs-profile-file:%t/cs.profdata /lto-pgo-warn-mismatch /opt:lldlto=2 %t/a.bc /out:%t/a.dll 2>&1 | FileCheck %s
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; Ensure lld will not generate warnings for profile cfg mismatch.
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; RUN: lld-link /dll /noentry /export:f /lto-cs-profile-file:%t/cs.profdata /lto-pgo-warn-mismatch:no /opt:lldlto=2 %t/a.bc /out:%t/a.dll 2>&1 | count 0
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; CHECK: warning: {{.*}} function control flow change detected (hash mismatch) f Hash = [[#]]
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;--- a.ll
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target datalayout = "e-m:w-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-pc-windows-msvc"
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define i32 @f(i32 returned %a) #0 {
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entry:
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ret i32 %a
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}
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attributes #0 = { "target-cpu"="x86-64" }
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!llvm.module.flags = !{!0, !1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 1, !"ProfileSummary", !2}
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!2 = !{!3, !4, !5, !6, !7, !8, !9, !10, !11, !12}
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!3 = !{!"ProfileFormat", !"InstrProf"}
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!4 = !{!"TotalCount", i64 2}
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!5 = !{!"MaxCount", i64 1}
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!6 = !{!"MaxInternalCount", i64 0}
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!7 = !{!"MaxFunctionCount", i64 1}
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!8 = !{!"NumCounts", i64 3}
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!9 = !{!"NumFunctions", i64 2}
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!10 = !{!"IsPartialProfile", i64 0}
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!11 = !{!"PartialProfileRatio", double 0.000000e+00}
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!12 = !{!"DetailedSummary", !13}
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!13 = !{!14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29}
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!14 = !{i32 10000, i64 0, i32 0}
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!15 = !{i32 100000, i64 0, i32 0}
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!16 = !{i32 200000, i64 0, i32 0}
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!17 = !{i32 300000, i64 0, i32 0}
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!18 = !{i32 400000, i64 0, i32 0}
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!19 = !{i32 500000, i64 1, i32 2}
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!20 = !{i32 600000, i64 1, i32 2}
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!21 = !{i32 700000, i64 1, i32 2}
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!22 = !{i32 800000, i64 1, i32 2}
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!23 = !{i32 900000, i64 1, i32 2}
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!24 = !{i32 950000, i64 1, i32 2}
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!25 = !{i32 990000, i64 1, i32 2}
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!26 = !{i32 999000, i64 1, i32 2}
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!27 = !{i32 999900, i64 1, i32 2}
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!28 = !{i32 999990, i64 1, i32 2}
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!29 = !{i32 999999, i64 1, i32 2}
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;--- cs.proftext
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# CSIR level Instrumentation Flag
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:csir
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f
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# Func Hash:
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1535914979662757887
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# Num Counters:
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2
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# Counter Values:
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1
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0
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