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23c462a8b5
This allows targets to make more decisions about reserved registers after isel. For example, now it should be certain there are calls or stack objects in the frame or not, which could have been introduced by legalization. Patch by Matthias Braun llvm-svn: 363757
55 lines
2.5 KiB
LLVM
55 lines
2.5 KiB
LLVM
; RUN: llc %s -start-after=codegenprepare -stop-after=finalize-isel -o - | FileCheck %s
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; PR39896: When code such as %conv below is dropped by SelectionDAG for having
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; no users, don't just drop the dbg.value record associated with it. Instead,
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; the corresponding variable should receive a "DBG_VALUE" undef to terminate
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; earlier variable live ranges.
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; ModuleID = 'run.c'
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source_filename = "run.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.14.0"
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@a = global i8 25, align 1, !dbg !0
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define signext i16 @b() !dbg !12 {
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entry:
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; CHECK: DBG_VALUE 23680, $noreg, ![[VARNUM:[0-9]+]],
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call void @llvm.dbg.value(metadata i16 23680, metadata !17, metadata !DIExpression()), !dbg !18
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%0 = load i8, i8* @a, align 1, !dbg !18
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%conv = sext i8 %0 to i16, !dbg !18
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; CHECK: DBG_VALUE $noreg, $noreg, ![[VARNUM]],
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call void @llvm.dbg.value(metadata i16 %conv, metadata !17, metadata !DIExpression()), !dbg !18
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%call = call i32 (...) @optimize_me_not(), !dbg !18
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%1 = load i8, i8* @a, align 1, !dbg !18
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%conv1 = sext i8 %1 to i16, !dbg !18
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ret i16 %conv1, !dbg !18
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}
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declare i32 @optimize_me_not(...)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9, !10}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 348101) (llvm/trunk 348109)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: GNU)
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!3 = !DIFile(filename: "run.c", directory: "/Users/dcci/work/llvm/build-debug/bin")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = !{i32 7, !"PIC Level", i32 2}
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!11 = !{!"clang version something"}
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!12 = distinct !DISubprogram(name: "b", scope: !3, file: !3, line: 2, type: !13, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!15}
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!15 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
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!16 = !{!17}
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!17 = !DILocalVariable(name: "i", scope: !12, file: !3, line: 3, type: !15)
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!18 = !DILocation(line: 3, scope: !12)
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