TheRock/compiler/amd-llvm/llvm/test/DebugInfo/MIR/X86/dbgcall-site-preserved-after.mir

# RUN: llc %s -o - -filetype=obj -start-after=livedebugvalues \
# RUN:      -emit-call-site-info | \
# RUN:  llvm-dwarfdump - | FileCheck %s

--- |
  ; ModuleID = 'pr43464.c'
  source_filename = "pr43464.c"
  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"

  define dso_local noundef i32 @caller() local_unnamed_addr !dbg !10 {
  entry:
    %call = tail call i64 @value(), !dbg !17
      #dbg_value(i64 %call, !15, !DIExpression(), !18)
    tail call void @callee(i64 noundef %call), !dbg !19
    %conv = trunc i64 %call to i32, !dbg !20
    ret i32 %conv, !dbg !21
  }

  declare !dbg !22 i64 @value() local_unnamed_addr

  declare !dbg !25 void @callee(i64 noundef) local_unnamed_addr

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8}
  !llvm.ident = !{!9}

  !0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 22.0.0git.prerel", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "pr43464.c", directory: "/", checksumkind: CSK_MD5, checksum: "e63080e8df26470df7e757aa6a4ccecd")
  !2 = !{i32 7, !"Dwarf Version", i32 5}
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = !{i32 1, !"wchar_size", i32 4}
  !5 = !{i32 8, !"PIC Level", i32 2}
  !6 = !{i32 7, !"PIE Level", i32 2}
  !7 = !{i32 7, !"uwtable", i32 2}
  !8 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
  !9 = !{!"clang version 22.0.0git.prerel"}
  !10 = distinct !DISubprogram(name: "caller", scope: !1, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !14, keyInstructions: true)
  !11 = !DISubroutineType(types: !12)
  !12 = !{!13}
  !13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !14 = !{!15}
  !15 = !DILocalVariable(name: "local", scope: !10, file: !1, line: 5, type: !16)
  !16 = !DIBasicType(name: "long", size: 64, encoding: DW_ATE_signed)
  !17 = !DILocation(line: 5, scope: !10, atomGroup: 1, atomRank: 2)
  !18 = !DILocation(line: 0, scope: !10)
  !19 = !DILocation(line: 6, scope: !10)
  !20 = !DILocation(line: 7, scope: !10, atomGroup: 3, atomRank: 2)
  !21 = !DILocation(line: 7, scope: !10, atomGroup: 3, atomRank: 1)
  !22 = !DISubprogram(name: "value", scope: !1, file: !1, line: 2, type: !23, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
  !23 = !DISubroutineType(types: !24)
  !24 = !{!16}
  !25 = !DISubprogram(name: "callee", scope: !1, file: !1, line: 1, type: !26, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
  !26 = !DISubroutineType(types: !27)
  !27 = !{null, !16}
...
---
name:            caller
fixedStack:
  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$rbx' }
callSites:
  - { bb: 0, offset: 3 }
  - { bb: 0, offset: 8, fwdArgRegs:
      - { arg: 0, reg: '$rdi' } }
body:             |
  bb.0.entry:
    liveins: $rbx

    frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !17
    frame-setup CFI_INSTRUCTION def_cfa_offset 16
    CFI_INSTRUCTION offset $rbx, -16
    CALL64pcrel32 target-flags(x86-plt) @value, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-instr-number 1, debug-location !17
    DBG_INSTR_REF !15, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 6), debug-location !18
    DBG_VALUE_LIST !15, !DIExpression(DW_OP_LLVM_arg, 0), $rbx, debug-location !18
    $rdi = MOV64rr $rax, debug-location !19
    $rbx = MOV64rr $rax, debug-location !17
    CALL64pcrel32 target-flags(x86-plt) @callee, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, debug-location !19
    $eax = MOV32rr $ebx, implicit killed $rbx, debug-location !21
    $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !21
    frame-destroy CFI_INSTRUCTION def_cfa_offset 8, debug-location !21
    RET64 $eax, debug-location !21
...

# Generated from the following C reproducer:
#
# extern void callee(long);
# extern long value(void);
#
# int caller() {
#   long local = value();
#   callee(local);
#   return local;
# }
#
# but with the order of the instructions saving the value of `local` in $rbx
# with the copy of $rax to $rdi switched.
#
# FIXME: The call site value interpreting code iterates
# instruction-by-instruction upwards, and does not keep track of which register
# values are saved during the call by succeeding instructions, so it does not
# understand that the value of $rdi is available in $rbx.
# CHECK-NOT: call_site_parameter