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6673639046
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
47 lines
2.0 KiB
LLVM
47 lines
2.0 KiB
LLVM
; RUN: llc < %s -x86-discriminate-memops -prefetch-hints-file=%S/insert-prefetch-invalid-instr.afdo | FileCheck %s
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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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