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