; LLVM IR from giacomo-ascari/dichotomic-compression :: legacy/dc/dc.ll (dc_decompression_destroy)

; Unoptimized IR (clang -disable-llvm-passes):
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"

%struct._dc_decompression = type { i32, i8, ptr, ptr, i8, i64, ptr, ptr }
%struct._dc_light_sector = type { %struct._dc_pixel, i8, i8, ptr, ptr }
%struct._dc_pixel = type { i8, i8, i8 }
%struct._dc_pixel_matrix = type { ptr, i32, i32 }

; Function Attrs: nounwind
declare void @free(ptr noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
define dso_local void @_dc_decompression_destroy(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct._dc_decompression, ptr %5, i32 0, i32 7
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  store ptr %7, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store ptr null, ptr %4, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %11, %1
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %17

11:                                               ; preds = %8
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %12, ptr %4, align 8, !tbaa !5
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct._dc_light_sector, ptr %13, i32 0, i32 3
  %15 = load ptr, ptr %14, align 8, !tbaa !13
  store ptr %15, ptr %3, align 8, !tbaa !5
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  call void @free(ptr noundef %16) #3
  br label %8, !llvm.loop !16

17:                                               ; preds = %8
  %18 = load ptr, ptr %2, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct._dc_decompression, ptr %18, i32 0, i32 6
  %20 = load ptr, ptr %19, align 8, !tbaa !18
  %21 = getelementptr inbounds %struct._dc_pixel_matrix, ptr %20, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !19
  call void @free(ptr noundef %22) #3
  %23 = load ptr, ptr %2, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct._dc_decompression, ptr %23, i32 0, i32 6
  %25 = load ptr, ptr %24, align 8, !tbaa !18
  call void @free(ptr noundef %25) #3
  %26 = load ptr, ptr %2, align 8, !tbaa !5
  call void @free(ptr noundef %26) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 48}
!10 = !{!"_dc_decompression", !11, i64 0, !7, i64 4, !6, i64 8, !6, i64 16, !7, i64 24, !12, i64 32, !6, i64 40, !6, i64 48}
!11 = !{!"int", !7, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = !{!14, !6, i64 8}
!14 = !{!"_dc_light_sector", !15, i64 0, !7, i64 3, !7, i64 4, !6, i64 8, !6, i64 16}
!15 = !{!"_dc_pixel", !7, i64 0, !7, i64 1, !7, i64 2}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = !{!10, !6, i64 40}
!19 = !{!20, !6, i64 0}
!20 = !{!"_dc_pixel_matrix", !6, i64 0, !11, i64 8, !11, i64 12}


; Optimized IR (opt -passes='default<O3>'):
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"

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @_dc_decompression_destroy(ptr nocapture noundef %0) local_unnamed_addr #1 {
  %2 = getelementptr inbounds i8, ptr %0, i64 48
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not8 = icmp eq ptr %3, null
  br i1 %.not8, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.09 = phi ptr [ %5, %.lr.ph ], [ %3, %1 ]
  %4 = getelementptr inbounds i8, ptr %.09, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !12
  tail call void @free(ptr noundef nonnull %.09) #2
  %.not = icmp eq ptr %5, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph, %1
  %6 = getelementptr inbounds i8, ptr %0, i64 40
  %7 = load ptr, ptr %6, align 8, !tbaa !17
  %8 = load ptr, ptr %7, align 8, !tbaa !18
  tail call void @free(ptr noundef %8) #2
  %9 = load ptr, ptr %6, align 8, !tbaa !17
  tail call void @free(ptr noundef %9) #2
  tail call void @free(ptr noundef %0) #2
  ret void
}

attributes #0 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !10, i64 48}
!6 = !{!"_dc_decompression", !7, i64 0, !8, i64 4, !10, i64 8, !10, i64 16, !8, i64 24, !11, i64 32, !10, i64 40, !10, i64 48}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!"long", !8, i64 0}
!12 = !{!13, !10, i64 8}
!13 = !{!"_dc_light_sector", !14, i64 0, !8, i64 3, !8, i64 4, !10, i64 8, !10, i64 16}
!14 = !{!"_dc_pixel", !8, i64 0, !8, i64 1, !8, i64 2}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = !{!6, !10, i64 40}
!18 = !{!19, !10, i64 0}
!19 = !{!"_dc_pixel_matrix", !10, i64 0, !7, i64 8, !7, i64 12}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass