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[EarlyCSE] If DI can't be salvaged, mark it as unavailable.

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Fixes PR39874.

llvm-svn: 349323
This commit is contained in:
Davide Italiano 2018-12-17 01:42:39 +00:00
parent 38e5dd7e13
commit 9414c8db71
2 changed files with 71 additions and 1 deletions
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3
lib/Transforms/Scalar/EarlyCSE.cpp
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@ -812,7 +812,8 @@ bool EarlyCSE::processNode(DomTreeNode *Node) {
LLVM_DEBUG(dbgs() << "Skipping due to debug counter\n");
continue;
}
salvageDebugInfo(*Inst);
if (!salvageDebugInfo(*Inst))
replaceDbgUsesWithUndef(Inst);
removeMSSA(Inst);
Inst->eraseFromParent();
Changed = true;

69
test/Transforms/EarlyCSE/debug-info-undef.ll Normal file
View File

@ -0,0 +1,69 @@
; RUN: opt -S %s -early-cse | FileCheck %s
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
@a = global i8 25, align 1, !dbg !0
define signext i16 @b() !dbg !12 {
entry:
call void @llvm.dbg.value(metadata i16 23680, metadata !17, metadata !DIExpression()), !dbg !18
%0 = load i8, i8* @a, align 1, !dbg !19, !tbaa !20
%conv = sext i8 %0 to i16, !dbg !19
; CHECK: call void @llvm.dbg.value(metadata i16 undef, metadata !17, metadata !DIExpression()), !dbg !18
; CHECK-NEXT: call i32 (...) @optimize_me_not()
call void @llvm.dbg.value(metadata i16 %conv, metadata !17, metadata !DIExpression()), !dbg !18
%call = call i32 (...) @optimize_me_not(), !dbg !23
%1 = load i8, i8* @a, align 1, !dbg !24, !tbaa !20
%conv1 = sext i8 %1 to i16, !dbg !24
ret i16 %conv1, !dbg !25
}
declare void @llvm.dbg.declare(metadata, metadata, metadata)
declare i32 @optimize_me_not(...)
define i32 @main() !dbg !26 {
entry:
%call = call signext i16 @b(), !dbg !30
ret i32 0, !dbg !31
}
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8, !9, !10}
!llvm.ident = !{!11}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: GNU)
!3 = !DIFile(filename: "patatino.c", directory: "/Users/davide/llvm-monorepo/llvm-mono/build/bin")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 4}
!10 = !{i32 7, !"PIC Level", i32 2}
!11 = !{!"clang version 8.0.0 "}
!12 = distinct !DISubprogram(name: "b", scope: !3, file: !3, line: 2, type: !13, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)
!13 = !DISubroutineType(types: !14)
!14 = !{!15}
!15 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
!16 = !{!17}
!17 = !DILocalVariable(name: "i", scope: !12, file: !3, line: 3, type: !15)
!18 = !DILocation(line: 3, column: 9, scope: !12)
!19 = !DILocation(line: 4, column: 7, scope: !12)
!20 = !{!21, !21, i64 0}
!21 = !{!"omnipotent char", !22, i64 0}
!22 = !{!"Simple C/C++ TBAA"}
!23 = !DILocation(line: 5, column: 3, scope: !12)
!24 = !DILocation(line: 6, column: 10, scope: !12)
!25 = !DILocation(line: 6, column: 3, scope: !12)
!26 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 8, type: !27, scopeLine: 8, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
!27 = !DISubroutineType(types: !28)
!28 = !{!29}
!29 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!30 = !DILocation(line: 8, column: 14, scope: !26)
!31 = !DILocation(line: 8, column: 19, scope: !26)