llvm/test/DebugInfo/X86/branch-folder-dbg.mir

# RUN: llc %s --start-before=branch-folder --stop-after=branch-folder -o - \
# RUN: | FileCheck %s --implicit-check-not=DBG_PHI

## Check that common instructions hoisted from `if.then` and `if.else` into
## common pred `entry` get merged debug locations. The debug instructions from
## both branches should get hoisted and killed.
##
## The MIR debug instructions have been modified by hand in order to check they
## can be killed.
##
## Check DBG_PHIs are deleted rather than hoisted (implicit-check-not).
##
## Check DBG_LABELs are hoisted and not modified (and don't cause a crash).

# CHECK: bb.0
# CHECK:      CALL64pcrel32 @f, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $rax
## --- Start splice from bb.2.if.else (and debug instructions from bb.1.if.then) ---
# CHECK-NEXT: DBG_LABEL 0
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(),  debug-location ![[#]]
# CHECK-NEXT: DBG_LABEL 1
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(),  debug-location ![[#]]
# CHECK-NEXT: $edi = MOV32r0 implicit-def dead $eflags, debug-instr-number 2, debug-location !DILocation(line: 0, scope: ![[#]])
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(DW_OP_LLVM_arg, 0),  debug-location ![[#]]
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(DW_OP_LLVM_arg, 0),  debug-location ![[#]]
## --- End splice ------------------------------------------------------------------
# CHECK-NEXT: TEST64rr killed renamable $rax, renamable $rax, implicit-def $eflags
# CHECK-NEXT: JCC_1 %bb.2, 9, implicit killed $eflags
# CHECK: bb.1

--- |
  target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-unknown-linux-gnu"

  declare dso_local noundef i64 @f() local_unnamed_addr

  define dso_local noundef i32 @g() local_unnamed_addr !dbg !7 {
    %call = tail call noundef i64 @f()
    %cmp1 = icmp sgt i64 0, %call
    %conv2 = trunc i64 0 to i32
    br i1 %cmp1, label %if.then, label %if.else

  if.then:                                          ; preds = %0
      #dbg_value(i64 0, !11, !DIExpression(), !13)
    tail call void @_Z3fooii(i32 noundef %conv2, i32 noundef 0), !dbg !14
      #dbg_value(i64 1, !11, !DIExpression(), !13)
    br label %if.end, !dbg !15

  if.else:                                          ; preds = %0
      #dbg_value(i64 2, !11, !DIExpression(), !13)
    tail call void @_Z3barii(i32 noundef %conv2, i32 noundef 1), !dbg !16
      #dbg_value(i64 3, !11, !DIExpression(), !13)
    br label %if.end, !dbg !17

  if.end:                                           ; preds = %if.else, %if.then
    ret i32 2
  }

  declare void @_Z3fooii(i32 noundef, i32 noundef) local_unnamed_addr

  declare void @_Z3barii(i32 noundef, i32 noundef) local_unnamed_addr

  !llvm.module.flags = !{!0, !1}
  !llvm.ident = !{!2}
  !llvm.dbg.cu = !{!3}
  !llvm.debugify = !{!5, !6}

  !0 = !{i32 7, !"Dwarf Version", i32 5}
  !1 = !{i32 2, !"Debug Info Version", i32 3}
  !2 = !{!"clang version 21.0.0"}
  !3 = distinct !DICompileUnit(language: DW_LANG_C, file: !4, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
  !4 = !DIFile(filename: "test.nodbg.ll", directory: "/")
  !5 = !{i32 15}
  !6 = !{i32 7}
  !7 = distinct !DISubprogram(name: "g", linkageName: "g", scope: null, file: !4, line: 1, type: !8, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !3, retainedNodes: !10)
  !8 = !DISubroutineType(types: !9)
  !9 = !{}
  !10 = !{!11}
  !11 = !DILocalVariable(name: "1", scope: !7, file: !4, line: 3, type: !12)
  !12 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned)
  !13 = !DILocation(line: 3, column: 1, scope: !7)
  !14 = !DILocation(line: 9, column: 1, scope: !7)
  !15 = !DILocation(line: 10, column: 1, scope: !7)
  !16 = !DILocation(line: 11, column: 1, scope: !7)
  !17 = !DILocation(line: 12, column: 1, scope: !7)
...
---
name:            g
tracksRegLiveness: true
isSSA: false
body:             |
  bb.0 (%ir-block.0):
    successors: %bb.1(0x40000000), %bb.2(0x40000000)

    frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
    frame-setup CFI_INSTRUCTION def_cfa_offset 16
    CALL64pcrel32 @f, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $rax
    TEST64rr killed renamable $rax, renamable $rax, implicit-def $eflags
    JCC_1 %bb.2, 9, implicit killed $eflags
    JMP_1 %bb.1

  bb.1.if.then:
    successors: %bb.3(0x80000000)

    DBG_PHI $esp, 3
    DBG_LABEL 0
    DBG_VALUE $esi, $noreg, !11, !DIExpression(),  debug-location !13
    $edi = MOV32r0 implicit-def dead $eflags, debug-instr-number 1, debug-location !14
    DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0),  debug-location !13
    $esi = MOV32r0 implicit-def dead $eflags,  debug-location !14
    CALL64pcrel32 target-flags(x86-plt) @_Z3fooii, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit killed $esi, implicit-def $rsp, implicit-def $ssp,  debug-location !14
    JMP_1 %bb.3,  debug-location !15

  bb.2.if.else:
    successors: %bb.3(0x80000000)

    DBG_PHI $esp, 4
    DBG_LABEL 1
    DBG_VALUE $esp, $noreg, !11, !DIExpression(), debug-location !13
    $edi = MOV32r0 implicit-def dead $eflags, debug-instr-number 2, debug-location !16
    DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0),  debug-location !13
    $esi = MOV32ri 1,  debug-location !16
    CALL64pcrel32 target-flags(x86-plt) @_Z3barii, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit killed $esi, implicit-def $rsp, implicit-def $ssp,  debug-location !16

  bb.3.if.end:
    $eax = MOV32ri 2
    $rcx = frame-destroy POP64r implicit-def $rsp, implicit $rsp
    frame-destroy CFI_INSTRUCTION def_cfa_offset 8
    RET 0, $eax
...