llvm/test/DebugInfo/MIR/X86/dvl-livedebugvars-stackptr.mir

# RUN: llc -start-after=phi-node-elimination -stop-after=virtregrewriter %s -mtriple=x86_64-unknown-unknown -o - | FileCheck %s
#
# This is a copy of the adjacent "-movements.mir" file, but where one of the
# operands to DBG_VALUE_LIST is a stack _pointer_ rather than a spilt value.
# The expression should grow no additional derefs for the stack pointer.
#
# CHECK-LABEL: bb.0.entry:
# CHECK:       $rbx = COPY $rsi
# CHECK-NEXT:  MOV64mr %stack.1, 1, $noreg, 0, $noreg, $rdi
# CHECK-NEXT:  DBG_VALUE_LIST !14, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_deref, DW_OP_LLVM_arg, 1, DW_OP_plus), %stack.1, %stack.0.local1
# CHECK-NEXT:  INLINEASM
# CHECK-NEXT:  $rax = MOV64rm %stack.1,
# CHECK-NEXT:  DBG_VALUE_LIST !14, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus), $rax, %stack.0.local1,
# CHECK-NEXT:  CALL64pcrel32 @foo
# CHECK-NEXT:  DBG_VALUE_LIST !14, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_deref, DW_OP_LLVM_arg, 1, DW_OP_plus), %stack.1, %stack.0.local1,
# CHECK-NEXT:  $rcx = COPY killed renamable $rbx
# CHECK-NEXT:  INLINEASM
# CHECK-NEXT:  $rax = MOV64rm %stack.1
# CHECK-NEXT:  DBG_VALUE_LIST !14, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus), $rax, %stack.0.local1,

--- |
  ; 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:
    %local1 = alloca i64
    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)
  
  !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
tracksRegLiveness: true
stack:
  - { id: 0, name: local1, type: default, offset: -24, 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.entry:
    liveins: $rdi, $rsi
  
    %4:gr64= COPY $rsi
    %2:gr64 = COPY $rdi
    DBG_VALUE_LIST !14, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus), %2, %stack.0, debug-location !17
    %3:gr64 = COPY killed %2
    %5:gr64 = COPY killed %4

    ; Force allocation into $rax and $rbx
    INLINEASM &"", 1, 12, implicit-def dead $rcx, 12, implicit-def dead $rdx, 12, implicit-def dead $rsi, 12, implicit-def dead $rdi, 12, implicit-def $rbp, 12, implicit-def dead $r8, 12, implicit-def dead $r9, 12, implicit-def dead $r10, 12, implicit-def dead $r11, 12, implicit-def dead $r12, 12, implicit-def dead $r13, 12, implicit-def dead $r14, 12, implicit-def dead $r15, 12, !18, debug-location !17

    ; Force a use of these two registers.
    CALL64pcrel32 @foo, csr_64, implicit $rsp, implicit $ssp, implicit %3, implicit %5

    ; Now make the register allocator move them to rcx and rdx!
    INLINEASM &"", 1, 12, implicit-def dead $rax, 12, implicit-def dead $rbx, 12, implicit-def dead $rsi, 12, implicit-def dead $rdi, 12, implicit-def $rbp, 12, implicit-def dead $r8, 12, implicit-def dead $r9, 12, implicit-def dead $r10, 12, implicit-def dead $r11, 12, implicit-def dead $r12, 12, implicit-def dead $r13, 12, implicit-def dead $r14, 12, implicit-def dead $r15, 12, !18, debug-location !17

    CALL64pcrel32 @foo, csr_64, implicit $rsp, implicit $ssp, implicit %3, implicit %5

    RET64
...