; LLVM IR from bartobri/data-structures-c :: priority-queue/doubly-linked-list-ordered-first-class (pq)

; 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.pq = type { ptr, ptr }
%struct.PQnode = type { i32, ptr, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind
declare void @free(ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @PQdelete(ptr noundef, ptr noundef) #2

; Function Attrs: nounwind uwtable
define dso_local void @PQdestroy(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.pq, ptr %4, i32 0, i32 0
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = getelementptr inbounds %struct.PQnode, ptr %6, i32 0, i32 2
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  store ptr %8, ptr %3, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %17, %1
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.PQnode, ptr %10, i32 0, i32 2
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.pq, ptr %13, i32 0, i32 0
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  %16 = icmp ne ptr %12, %15
  br i1 %16, label %17, label %25

17:                                               ; preds = %9
  %18 = load ptr, ptr %2, align 8, !tbaa !5
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  call void @PQdelete(ptr noundef %18, ptr noundef %19)
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.pq, ptr %20, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = getelementptr inbounds %struct.PQnode, ptr %22, i32 0, i32 2
  %24 = load ptr, ptr %23, align 8, !tbaa !11
  store ptr %24, ptr %3, align 8, !tbaa !5
  br label %9, !llvm.loop !14

25:                                               ; preds = %9
  %26 = load ptr, ptr %2, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.pq, ptr %26, i32 0, i32 0
  %28 = load ptr, ptr %27, align 8, !tbaa !9
  call void @free(ptr noundef %28) #3
  %29 = load ptr, ptr %2, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.pq, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !16
  call void @free(ptr noundef %31) #3
  %32 = load ptr, ptr %2, align 8, !tbaa !5
  call void @free(ptr noundef %32) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 0}
!10 = !{!"pq", !6, i64 0, !6, i64 8}
!11 = !{!12, !6, i64 16}
!12 = !{!"PQnode", !13, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!"int", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!10, !6, i64 8}


; 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
declare dso_local void @PQdelete(ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @PQdestroy(ptr noundef %0) local_unnamed_addr #1 {
  %.pn10 = load ptr, ptr %0, align 8, !tbaa !5
  %.0.in11 = getelementptr inbounds i8, ptr %.pn10, i64 16
  %.012 = load ptr, ptr %.0.in11, align 8, !tbaa !10
  %2 = getelementptr inbounds i8, ptr %.012, i64 16
  %3 = load ptr, ptr %2, align 8, !tbaa !10
  %.not13 = icmp eq ptr %3, %.pn10
  br i1 %.not13, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.014 = phi ptr [ %.0, %.lr.ph ], [ %.012, %1 ]
  tail call void @PQdelete(ptr noundef nonnull %0, ptr noundef nonnull %.014)
  %.pn = load ptr, ptr %0, align 8, !tbaa !5
  %.0.in = getelementptr inbounds i8, ptr %.pn, i64 16
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !10
  %4 = getelementptr inbounds i8, ptr %.0, i64 16
  %5 = load ptr, ptr %4, align 8, !tbaa !10
  %.not = icmp eq ptr %5, %.pn
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.pn.lcssa = phi ptr [ %.pn10, %1 ], [ %.pn, %.lr.ph ]
  tail call void @free(ptr noundef nonnull %.pn.lcssa) #2
  %6 = getelementptr inbounds i8, ptr %0, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !15
  tail call void @free(ptr noundef %7) #2
  tail call void @free(ptr noundef nonnull %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, !7, i64 0}
!6 = !{!"pq", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!11, !7, i64 16}
!11 = !{!"PQnode", !12, i64 0, !7, i64 8, !7, i64 16}
!12 = !{!"int", !8, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!6, !7, i64 8}


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