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llvm-project/llvm/test/DebugInfo/X86/sdagsplit-1.ll

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[Debug info] Transfer DI to fragment expressions for split integer values. This patch teaches the SDag type legalizer how to split up debug info for integer values that are split into a hi and lo part. (re-commit) Differential Revision: https://reviews.llvm.org/D36805 llvm-svn: 311181
2017-08-19 02:07:00 +08:00
; RUN: llc %s -stop-after=livedebugvars -o %t
; RUN: cat %t | FileCheck %s
;
; Test that we can emit debug info for large values that are split
; up across multiple registers by the SelectionDAG type legalizer.
;
; // Compile with -O1 -m32.
; long long foo (long long a, long long b)
; {
; long long res = b+1;
; if ( a == b )
; return res;
; return 0;
; }
;
MachineOperand/MIParser: Do not print debug-use flag, infer it The debug-use flag must be set exactly for uses on DBG_VALUEs. This is so obvious that it can be trivially inferred while parsing. This will reduce noise when printing while omitting an information that has little value to the user. The parser will keep recognizing the flag for compatibility with old `.mir` files. Differential Revision: https://reviews.llvm.org/D53903 llvm-svn: 345671
2018-10-31 07:28:27 +08:00
; CHECK-DAG: DBG_VALUE ${{[a-z]+}}, $noreg, !{{[0-9]+}}, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !{{[0-9]+}}
; CHECK-DAG: DBG_VALUE ${{[a-z]+}}, $noreg, !{{[0-9]+}}, !DIExpression(DW_OP_LLVM_fragment, 32, 32), debug-location !{{[0-9]+}}
[Debug info] Transfer DI to fragment expressions for split integer values. This patch teaches the SDag type legalizer how to split up debug info for integer values that are split into a hi and lo part. (re-commit) Differential Revision: https://reviews.llvm.org/D36805 llvm-svn: 311181
2017-08-19 02:07:00 +08:00
; ModuleID = 'sdagsplit-1.c'
target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i386"
; Function Attrs: nounwind readnone
define i64 @foo(i64 %a, i64 %b) local_unnamed_addr #0 !dbg !8 {
entry:
tail call void @llvm.dbg.value(metadata i64 %a, metadata !13, metadata !16), !dbg !17
tail call void @llvm.dbg.value(metadata i64 %b, metadata !14, metadata !16), !dbg !18
%cmp = icmp eq i64 %a, %b, !dbg !20
%add = add nsw i64 %b, 1, !dbg !22
[DebugInfo] Sink related dbg users when sinking in InstCombine Summary: When sinking an instruction in InstCombine we now also sink the DbgInfoIntrinsics that are using the sunken value. Example) When sinking the load in this input bb.X: %0 = load i64, i64* %start, align 4, !dbg !31 tail call void @llvm.dbg.value(metadata i64 %0, ...) br i1 %cond, label %for.end, label %for.body.lr.ph for.body.lr.ph: br label %for.body we now also move the dbg.value, like this bb.X: br i1 %cond, label %for.end, label %for.body.lr.ph for.body.lr.ph: %0 = load i64, i64* %start, align 4, !dbg !31 tail call void @llvm.dbg.value(metadata i64 %0, ...) br label %for.body In the past we haven't moved the dbg.value so we got bb.X: tail call void @llvm.dbg.value(metadata i64 %0, ...) br i1 %cond, label %for.end, label %for.body.lr.ph for.body.lr.ph: %0 = load i64, i64* %start, align 4, !dbg !31 br label %for.body So in the past we got a debug-use before the def of %0. And that dbg.value was also on the path jumping to %for.end, for which %0 never was defined. CodeGenPrepare normally comes to rescue later (when not moving the dbg.value), since it moves dbg.value instrinsics quite brutally, without really analysing if it is correct to move the intrinsic (see PR31878). So at the moment this patch isn't expected to have much impact, besides that it is moving the dbg.value already in opt, making the IR look more sane directly. This can be seen as a preparation to (hopefully) make it possible to turn off CodeGenPrepare::placeDbgValues later as a solution to PR31878. I also adjusted test/DebugInfo/X86/sdagsplit-1.ll to make the IR in the test case up-to-date with this behavior in InstCombine. Reviewers: rnk, vsk, aprantl Reviewed By: vsk, aprantl Subscribers: mattd, JDevlieghere, llvm-commits Tags: #debug-info Differential Revision: https://reviews.llvm.org/D45425 llvm-svn: 330243
2018-04-18 16:08:04 +08:00
tail call void @llvm.dbg.value(metadata i64 %add, metadata !15, metadata !16), !dbg !19
[Debug info] Transfer DI to fragment expressions for split integer values. This patch teaches the SDag type legalizer how to split up debug info for integer values that are split into a hi and lo part. (re-commit) Differential Revision: https://reviews.llvm.org/D36805 llvm-svn: 311181
2017-08-19 02:07:00 +08:00
%retval.0 = select i1 %cmp, i64 %add, i64 0, !dbg !23
ret i64 %retval.0, !dbg !24
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind readnone }
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "sdagsplit-1.c", directory: "/X86")
!2 = !{}
!3 = !{i32 1, !"NumRegisterParameters", i32 0}
!4 = !{i32 2, !"Dwarf Version", i32 2}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{i32 1, !"wchar_size", i32 4}
!7 = !{!"clang version 6.0.0 "}
[DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
2018-05-09 10:40:45 +08:00
!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
[Debug info] Transfer DI to fragment expressions for split integer values. This patch teaches the SDag type legalizer how to split up debug info for integer values that are split into a hi and lo part. (re-commit) Differential Revision: https://reviews.llvm.org/D36805 llvm-svn: 311181
2017-08-19 02:07:00 +08:00
!9 = !DISubroutineType(types: !10)
!10 = !{!11, !11, !11}
!11 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
!12 = !{!13, !14, !15}
!13 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 2, type: !11)
!14 = !DILocalVariable(name: "b", arg: 2, scope: !8, file: !1, line: 2, type: !11)
!15 = !DILocalVariable(name: "res", scope: !8, file: !1, line: 4, type: !11)
!16 = !DIExpression()
!17 = !DILocation(line: 2, column: 26, scope: !8)
!18 = !DILocation(line: 2, column: 39, scope: !8)
!19 = !DILocation(line: 4, column: 12, scope: !8)
!20 = !DILocation(line: 5, column: 9, scope: !21)
!21 = distinct !DILexicalBlock(scope: !8, file: !1, line: 5, column: 7)
!22 = !DILocation(line: 4, column: 19, scope: !8)
!23 = !DILocation(line: 5, column: 7, scope: !8)
!24 = !DILocation(line: 8, column: 1, scope: !8)