[llvm] Opt-in flag for X86DiscriminateMemOps
Summary:
Currently, if an instruction with a memory operand has no debug information,
X86DiscriminateMemOps will generate one based on the first line of the
enclosing function, or the last seen debug info.
This may cause confusion in certain debugging scenarios. The long term
approach would be to use the line number '0' in such cases, however, that
brings in challenges: the base discriminator value range is limited
(4096 values).
For the short term, adding an opt-in flag for this feature.
See bug 40319 (https://bugs.llvm.org/show_bug.cgi?id=40319)
Reviewers: dblaikie, jmorse, gbedwell
Reviewed By: dblaikie
Subscribers: aprantl, eraman, hiraditya
Differential Revision: https://reviews.llvm.org/D57257
llvm-svn: 352246
2019-01-26 05:49:54 +08:00
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; RUN: llc < %s -x86-discriminate-memops -prefetch-hints-file=%S/insert-prefetch-invalid-instr.afdo | FileCheck %s
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2018-11-30 09:01:52 +08:00
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; ModuleID = 'prefetch.cc'
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source_filename = "prefetch.cc"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: norecurse nounwind uwtable
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define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 {
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entry:
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tail call void @llvm.prefetch(i8* inttoptr (i64 291 to i8*), i32 0, i32 0, i32 1), !dbg !9
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tail call void @llvm.x86.avx512.gatherpf.dpd.512(i8 97, <8 x i32> undef, i8* null, i32 1, i32 2), !dbg !10
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ret i32 291, !dbg !11
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}
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; Function Attrs: inaccessiblemem_or_argmemonly nounwind
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declare void @llvm.prefetch(i8* nocapture readonly, i32, i32, i32) #1
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; Function Attrs: argmemonly nounwind
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declare void @llvm.x86.avx512.gatherpf.dpd.512(i8, <8 x i32>, i8*, i32, i32) #2
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attributes #0 = {"target-cpu"="x86-64" "target-features"="+avx512pf,+sse4.2,+ssse3"}
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attributes #1 = { inaccessiblemem_or_argmemonly nounwind }
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attributes #2 = { argmemonly nounwind }
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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_C_plus_plus, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2, debugInfoForProfiling: true)
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!1 = !DIFile(filename: "prefetch.cc", 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 7.0.0 (trunk 327078) (llvm/trunk 327086)"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 8, type: !8, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0)
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!8 = !DISubroutineType(types: !2)
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!9 = !DILocation(line: 12, column: 3, scope: !7)
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!10 = !DILocation(line: 14, column: 3, scope: !7)
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!11 = !DILocation(line: 15, column: 3, scope: !7)
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;CHECK-LABEL: main:
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;CHECK: # %bb.0:
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;CHECK: prefetchnta 291
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;CHECK-NOT: prefetchnta 42(%rax,%ymm0)
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;CHECK: vgatherpf1dpd (%rax,%ymm0) {%k1}
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