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# RUN: llc --run-pass=livedebugvalues -o - %s | FileCheck %s
# REQUIRES: x86-registered-target
# This test covers the scenario that saves a register on the stack, uses this register as an entry value DBG_VALUE location, and then clobbers it.
--- |
target triple = "x86_64-"
define void @foo(ptr swiftasync %0) !dbg !4 {
call void @llvm.dbg.value(metadata ptr %0, metadata !9, metadata !DIExpression(DW_OP_LLVM_entry_value, 1)), !dbg !17
ret void
}
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.module.flags = !{!0}
!llvm.dbg.cu = !{!1}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = distinct !DICompileUnit(language: DW_LANG_Swift, file: !2, producer: "blah", isOptimized: true, flags: "blah", runtimeVersion: 5, emissionKind: FullDebug)
!2 = !DIFile(filename: "blah", directory: "blah")
!3 = !{}
!4 = distinct !DISubprogram(name: "blah", linkageName: "blah", scope: !2, file: !2, line: 284, type: !7, unit: !1)
!7 = !DISubroutineType(types: !3)
!9 = !DILocalVariable(name: "self", arg: 3, scope: !4, file: !2, line: 328, type: !12, flags: DIFlagArtificial)
!12 = !DICompositeType(tag: DW_TAG_structure_type, name: "blah", scope: !2, file: !2, size: 64, elements: !3)
!17 = !DILocation(line: 328, column: 17, scope: !4)
...
---
name: foo
alignment: 16
debugInstrRef: true
tracksDebugUserValues: true
liveins:
- { reg: '$r14', virtual-reg: '' }
stack:
- { id: 0, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
body: |
bb.0:
liveins: $r14
; Put a copy of r14 on the stack.
MOV64mr $rbp, 1, $noreg, -48, $noreg, $r14 :: (store (s64) into %stack.0)
DBG_VALUE $r14, $noreg, !9, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location !17
MOV64mi32 $noreg, 1, $noreg, 0, $noreg, 0, debug-location !17 :: (store (s64) into `ptr null`)
$r14 = MOV64rr killed $r13
; Clobber $r14
RETI64 24
# CHECK: bb.0:
# CHECK: MOV64mr $rbp, 1, $noreg, -48, $noreg, $r14
# CHECK-NEXT: DBG_VALUE $r14, {{.*}}, !DIExpression(DW_OP_LLVM_entry_value, 1)
# CHECK-NOT: DBG_VALUE
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