# RUN: llc -start-after=phi-node-elimination -stop-after=virtregrewriter %s -mtriple=x86_64-unknown-unknown -o - -experimental-debug-variable-locations=false | FileCheck %s
#
# Test that when a livedebugvars interval crosses a basic block boundary,
# DBG_VALUEs are created in each covered basic block. In the IR below, control
# flow moves from the bottom upwards, and the DBG_VALUEs from the entry block
# to bb.1 become a single range. Check that they're transformed back into two
# DBG_VALUEs after regalloc.
# These checks look at the entry and bb.1 blocks, and ensure that there is a
# DBG_VALUE in each.
# CHECK: ![[VARNUM:[0-9]+]] = !DILocalVariable(name: "b",
# CHECK-LABEL: name: bar
# CHECK-LABEL: bb.0.entry:
# CHECK: DBG_VALUE $[[SOMEREG:[a-z]+]], $noreg, ![[VARNUM]], !DIExpression()
# CHECK-NEXT: JMP_1 %bb.3
# CHECK-LABEL: bb.1.bb1:
# CHECK: DBG_VALUE $[[SOMEREG]], $noreg, ![[VARNUM]], !DIExpression()
# CHECK-NEXT: JMP_1 %bb.4
--- |
; ModuleID = 'tmp.ll'
source_filename = "tmp.ll"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
%struct.a = type { i32 }
; Function Attrs: nounwind ssp
define i32 @bar(ptr nocapture %b, i32 %shoes) !dbg !4 {
entry:
tail call void @llvm.dbg.value(metadata i32 %shoes, metadata !9, metadata !DIExpression()), !dbg !16
%tmp1 = getelementptr inbounds %struct.a, ptr %b, i64 0, i32 0, !dbg !17
br label %bb3
bb1: ; preds = %bb2
tail call void @llvm.dbg.value(metadata i32 %shoes, metadata !9, metadata !DIExpression()), !dbg !16
%add = add nsw i32 %tmp2, 1, !dbg !18
br label %exit
bb2: ; preds = %bb3
tail call void @llvm.dbg.value(metadata i32 %tmp2, metadata !14, metadata !DIExpression()), !dbg !17
%call = tail call i32 (...) @foo(i32 %tmp2), !dbg !19
br label %bb1
bb3: ; preds = %entry
%tmp2 = load i32, ptr %tmp1, align 4, !dbg !17
br label %bb2
exit: ; preds = %bb1
ret i32 %shoes, !dbg !18
}
declare i32 @foo(...)
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
; Function Attrs: nounwind
declare void @llvm.stackprotector(ptr, ptr)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 2.9 (trunk 122997)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2)
!1 = !DIFile(filename: "bar.c", directory: "/private/tmp")
!2 = !{}
!3 = !{i32 1, !"Debug Info Version", i32 3}
!4 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !5, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
!5 = !DISubroutineType(types: !6)
!6 = !{!7}
!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!8 = !{!9, !14}
!9 = !DILocalVariable(name: "b", arg: 1, scope: !4, file: !1, line: 5, type: !10)
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !0, baseType: !11, size: 64, align: 64)
!11 = !DICompositeType(tag: DW_TAG_structure_type, name: "a", scope: !0, file: !1, line: 1, size: 32, align: 32, elements: !12)
!12 = !{!13}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !1, file: !1, line: 2, baseType: !7, size: 32, align: 32)
!14 = !DILocalVariable(name: "x", scope: !15, file: !1, line: 6, type: !7)
!15 = distinct !DILexicalBlock(scope: !4, file: !1, line: 5, column: 22)
!16 = !DILocation(line: 5, column: 19, scope: !4)
!17 = !DILocation(line: 6, column: 14, scope: !15)
!18 = !DILocation(line: 8, column: 2, scope: !15)
!19 = !DILocation(line: 7, column: 2, scope: !15)
...
---
name: bar
alignment: 16
tracksRegLiveness: true
registers:
- { id: 0, class: gr64 }
- { id: 1, class: gr32 }
- { id: 2, class: gr64 }
- { id: 3, class: gr64 }
- { id: 4, class: gr32 }
- { id: 5, class: gr32 }
- { id: 6, class: gr32 }
- { id: 7, class: gr32 }
liveins:
- { reg: '$rdi', virtual-reg: '%2' }
- { reg: '$esi', virtual-reg: '%4' }
frameInfo:
adjustsStack: true
hasCalls: true
machineFunctionInfo: {}
body: |
bb.0.entry:
liveins: $rdi, $esi
%4:gr32 = COPY $esi
%2:gr64 = COPY $rdi
%3:gr64 = COPY killed %2
%5:gr32 = COPY killed %4
DBG_VALUE %5, $noreg, !9, !DIExpression(), debug-location !16
JMP_1 %bb.3
bb.1.bb1:
DBG_VALUE %5, $noreg, !9, !DIExpression(), debug-location !16
JMP_1 %bb.4
bb.2.bb2:
DBG_VALUE %6, $noreg, !14, !DIExpression(), debug-location !17
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !19
$edi = COPY %6, debug-location !19
$al = MOV8ri 0, debug-location !19
CALL64pcrel32 @foo, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit $edi, implicit-def $eax, debug-location !19
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !19
%7:gr32 = COPY $eax, debug-location !19
JMP_1 %bb.1
bb.3.bb3:
%6:gr32 = MOV32rm %3, 1, $noreg, 0, $noreg, debug-location !17 :: (load (s32) from %ir.tmp1)
JMP_1 %bb.2
bb.4.exit:
$eax = COPY %5, debug-location !18
RET64 implicit $eax, debug-location !18
...
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