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[SelectionDAG] Transfer DbgValues when casts are optimized in SelectionDAG::getNode

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Summary:
getNode optimizes (ext (trunc x)) to x and the dbgvalue node on trunc is lost. The fix calls transferDbgValues to add the dbgvalue to x.

Add DebugInfo/AArch64/dbg-value-i16.ll

Patch by Sejong Oh!

Reviewers: aprantl, javed.absar, llvm-commits, vsk

Reviewed By: aprantl, vsk

Subscribers: kristof.beyls, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D46348

llvm-svn: 331665
This commit is contained in:
Aaron Smith 2018-05-07 20:15:50 +00:00
parent da0e47c3e6
commit 640bbb647d
2 changed files with 55 additions and 2 deletions
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6
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -3962,11 +3962,13 @@ SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
else if (OpOpcode == ISD::UNDEF)
return getUNDEF(VT);
// (ext (trunx x)) -> x
// (ext (trunc x)) -> x
if (OpOpcode == ISD::TRUNCATE) {
SDValue OpOp = Operand.getOperand(0);
if (OpOp.getValueType() == VT)
if (OpOp.getValueType() == VT) {
transferDbgValues(Operand, OpOp);
return OpOp;
}
}
break;
case ISD::TRUNCATE:

51
test/DebugInfo/AArch64/dbg-value-i16.ll Normal file
View File

@ -0,0 +1,51 @@
; RUN: llc -stop-after=livedebugvalues < %s | FileCheck %s
;
; ModuleID = 'dbg-value-i16.ll'
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64"
; CHECK: DBG_VALUE
; Function Attrs: nounwind
define void @f() #0 !dbg !4 {
entry:
tail call void @h(i16 0) #2, !dbg !14
%call = tail call i16 (...) @g() #2, !dbg !15
tail call void @llvm.dbg.value(metadata i16 %call, metadata !8, metadata !16), !dbg !17
tail call void @h(i16 %call) #2, !dbg !18
ret void, !dbg !19
}
declare void @h(i16)
declare i16 @g(...)
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!10, !11, !12}
!llvm.ident = !{!13}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test.c", directory: "/Volumes/Data/llvm")
!2 = !{}
!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, variables: !7)
!5 = !DISubroutineType(types: !6)
!6 = !{null}
!7 = !{!8}
!8 = !DILocalVariable(name: "a", scope: !4, file: !1, line: 5, type: !9)
!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!10 = !{i32 2, !"Dwarf Version", i32 2}
!11 = !{i32 2, !"Debug Info Version", i32 3}
!12 = !{i32 1, !"PIC Level", i32 2}
!13 = !{!"clang version 3.9.0 "}
!14 = !DILocation(line: 4, column: 3, scope: !4)
!15 = !DILocation(line: 5, column: 11, scope: !4)
!16 = !DIExpression()
!17 = !DILocation(line: 5, column: 7, scope: !4)
!18 = !DILocation(line: 6, column: 3, scope: !4)
!19 = !DILocation(line: 7, column: 1, scope: !4)