# RUN: llc -run-pass=livedebugvalues %s -o - | FileCheck %s
#
# This test tests tracking variables value transferring from one register to another.
# This example is altered additionally in order to test transferring from one float register
# to another. The altered instructions are labeled below.
#
# CHECK: ![[ARG1:.*]] = !DILocalVariable(name: "arg1"
# CHECK: DBG_VALUE $r4, $noreg, ![[ARG1]], !DIExpression(), debug-location
# CHECK: $r5 = MOVr killed $r4, 14 /* CC::al */, $noreg, $noreg, debug-location
# CHECK-NEXT: DBG_VALUE $r5, $noreg, ![[ARG1]], !DIExpression(), debug-location
--- |
; ModuleID = 'live-debug-values-reg-copy.ll'
source_filename = "live-debug-values-reg-copy.c"
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv4t--"
define dso_local arm_aapcscc i32 @foo(i32 %arg1) local_unnamed_addr !dbg !8 {
entry:
call void @llvm.dbg.value(metadata i32 %arg1, metadata !13, metadata !DIExpression()), !dbg !16
%cmp = icmp sgt i32 %arg1, 10, !dbg !16
br i1 %cmp, label %if.end, label %if.else, !dbg !16
if.else: ; preds = %entry
%add5 = add nsw i32 %arg1, 10, !dbg !16
call void @llvm.dbg.value(metadata i32 %add5, metadata !13, metadata !DIExpression()), !dbg !16
%call6 = tail call arm_aapcscc i32 @externFunc2(i32 %add5), !dbg !16
%call8 = tail call arm_aapcscc i32 @externFunc(i32 %add5), !dbg !16
ret i32 %call6, !dbg !16
if.end: ; preds = %entry
%call = tail call arm_aapcscc i32 @externFunc(i32 %arg1), !dbg !16
ret i32 1, !dbg !16
}
declare dso_local arm_aapcscc i32 @externFunc(i32) local_unnamed_addr
declare dso_local arm_aapcscc i32 @externFunc2(i32) local_unnamed_addr
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #0
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**) #1
attributes #0 = { nounwind readnone speculatable }
attributes #1 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "live-debug-values-reg-copy.c", directory: "/")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{i32 1, !"min_enum_size", i32 4}
!7 = !{!"clang version 7.0.0"}
!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 4, type: !9, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
!9 = !DISubroutineType(types: !10)
!10 = !{!11, !11}
!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!12 = !{!13}
!13 = !DILocalVariable(name: "arg1", arg: 1, scope: !8, file: !1, line: 4, type: !11)
!16 = !DILocation(line: 4, column: 13, scope: !8)
...
---
name: foo
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
tracksRegLiveness: false
registers:
liveins:
- { reg: '$r0', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 16
offsetAdjustment: 0
maxAlignment: 4
adjustsStack: true
hasCalls: true
stackProtector: ''
maxCallFrameSize: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
savePoint: ''
restorePoint: ''
fixedStack:
stack:
- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r5', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
constants:
body: |
bb.0.entry:
successors: %bb.1(0x40000000), %bb.2(0x40000000)
$sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r5, killed $r11, killed $lr
frame-setup CFI_INSTRUCTION def_cfa_offset 16
frame-setup CFI_INSTRUCTION offset $lr, -4
frame-setup CFI_INSTRUCTION offset $r11, -8
frame-setup CFI_INSTRUCTION offset $r5, -12
frame-setup CFI_INSTRUCTION offset $r4, -16
DBG_VALUE $r0, $noreg, !13, !DIExpression(), debug-location !16
DBG_VALUE $r0, $noreg, !13, !DIExpression(), debug-location !16
CMPri renamable $r0, 10, 14, $noreg, implicit-def $cpsr, debug-location !16
Bcc %bb.2, 13, killed $cpsr, debug-location !16
bb.1.if.end:
BL @externFunc, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def dead $r0, debug-location !16
$r0 = MOVi 1, 14, $noreg, $noreg, debug-location !16
$sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r5, def $r11, def $lr, debug-location !16
BX_RET 14, $noreg, implicit killed $r0, debug-location !16
bb.2.if.else:
renamable $r4 = ADDri killed renamable $r0, 10, 14, $noreg, $noreg, debug-location !16
DBG_VALUE $r4, $noreg, !13, !DIExpression(), debug-location !16
$r0 = MOVr $r4, 14, $noreg, $noreg, debug-location !16
BL @externFunc2, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def $r0, debug-location !16
$r5 = MOVr killed $r0, 14, $noreg, $noreg, debug-location !16
$r0 = MOVr $r4, 14, $noreg, $noreg, debug-location !16
BL @externFunc, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def dead $r0, debug-location !16
$r0 = MOVr killed $r5, 14, $noreg, $noreg, debug-location !16
; Instruction below is added in order to test moving variable's value from one register to another.
$r5 = MOVr killed $r4, 14, $noreg, $noreg, debug-location !16
$sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r5, def $r11, def $lr, debug-location !16
BX_RET 14, $noreg, implicit killed $r0, debug-location !16
...