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112 lines
3.8 KiB
112 lines
3.8 KiB
# RUN: llc %s -mtriple=x86_64-unknown-unknown -o - -run-pass=livedebugvalues | FileCheck %s --implicit-check-not=DBG_VALUE
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# RUN: llc %s -mtriple=x86_64-unknown-unknown -o - -run-pass=livedebugvalues -experimental-debug-variable-locations | FileCheck %s -check-prefix=NEWLDV --implicit-check-not=DBG_VALUE
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#
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# Test that the DBG_VALUE of ecx below does not get propagated. It is considered
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# live-in on LiveDebugValues' first pass through the loop, but on the second it
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# should be removed from the InLocs set because it gets clobbered inside the
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# loop. There should be no transfer from ecx to ebx -- this is ensured by the
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# FileCheck implicit-check-not option.
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#
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# FIXME: we successfully prevent the false location (ebx) from being
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# propagated into block 2, but the original transfer isn't yet eliminated.
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# Thus we get no DBG_VALUe in block 2, but an invalid one in block 1.
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#
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# CHECK-LABEL: name: foo
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# CHECK-LABEL: bb.0.entry:
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# CHECK: $ecx = MOV32ri 0
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# CHECK-NEXT: DBG_VALUE
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# CHECK-LABEL: bb.1.loop:
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# CHECK: $ebx = COPY killed $ecx
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# CHECK-NEXT: DBG_VALUE
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#
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# This doesn't occur under value-tracking LiveDebugValues though.
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#
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# NEWLDV-LABEL: name: foo
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# NEWLDV-LABEL: bb.0.entry:
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# NEWLDV: $ecx = MOV32ri 0
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# NEWLDV-NEXT: DBG_VALUE
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--- |
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source_filename = "live-debug-values-remove-range.ll"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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define i32 @foo(i32 %bar) !dbg !4 {
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entry:
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br label %loop
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loop:
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br label %loop
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exit:
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ret i32 %bar
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}
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!llvm.module.flags = !{!0, !1}
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!llvm.dbg.cu = !{!2}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = !{i32 2, !"Dwarf Version", i32 4}
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "beards", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!3 = !DIFile(filename: "bees.cpp", directory: ".")
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!4 = distinct !DISubprogram(name: "nope", scope: !3, file: !3, line: 1, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DILocalVariable(name: "thin", scope: !4, file: !3, line: 1, type: !7)
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!10 = !DILocation(line: 1, scope: !4)
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...
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---
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name: foo
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '$edi' }
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frameInfo:
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stackSize: 8
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offsetAdjustment: -8
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maxAlignment: 1
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adjustsStack: true
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hasCalls: true
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 8
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fixedStack:
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- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$rbx' }
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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liveins: $edi, $rbx
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frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 16
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CFI_INSTRUCTION offset $rbx, -16
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$ebx = MOV32rr $edi
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$eax = MOV32ri 0, debug-location !10
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$ecx = MOV32ri 0, debug-location !10
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DBG_VALUE $ecx, $noreg, !9, !DIExpression(), debug-location !10
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$edi = MOV32ri 0, debug-location !10
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$esi = MOV32ri 0, debug-location !10
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bb.1.loop:
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successors: %bb.1, %bb.2
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liveins: $ebx, $eax, $ecx, $edi, $esi
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$eax = COPY $ecx, debug-location !10
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$ebx = COPY killed $ecx, debug-location !10
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$ecx = COPY killed $edi, debug-location !10
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$edi = COPY killed $esi, debug-location !10
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$esi = MOV32ri 1, debug-location !10
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TEST8ri killed renamable $al, 1, implicit-def $eflags
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JCC_1 %bb.1, 5, implicit killed $eflags, debug-location !10
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bb.2.exit:
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liveins: $ebx
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$eax = MOV32rr killed $ebx, debug-location !10
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$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 8
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RETQ $eax, debug-location !10
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...
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