; 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.PQnode = type { i32, ptr, ptr }
%struct.pq = type { 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: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

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

; Function Attrs: nounwind uwtable
define dso_local ptr @PQinsert(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %7 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %7, ptr %6, align 8, !tbaa !5
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.PQnode, ptr %9, i32 0, i32 0
  store i32 %8, ptr %10, align 8, !tbaa !11
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.pq, ptr %11, i32 0, i32 0
  %13 = load ptr, ptr %12, align 8, !tbaa !13
  %14 = getelementptr inbounds %struct.PQnode, ptr %13, i32 0, i32 2
  %15 = load ptr, ptr %14, align 8, !tbaa !15
  store ptr %15, ptr %5, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %32, %2
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.PQnode, ptr %17, i32 0, i32 2
  %19 = load ptr, ptr %18, align 8, !tbaa !15
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.pq, ptr %20, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !13
  %23 = icmp ne ptr %19, %22
  br i1 %23, label %24, label %36

24:                                               ; preds = %16
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.PQnode, ptr %25, i32 0, i32 0
  %27 = load i32, ptr %26, align 8, !tbaa !11
  %28 = load i32, ptr %4, align 4, !tbaa !9
  %29 = icmp slt i32 %27, %28
  br i1 %29, label %30, label %31

30:                                               ; preds = %24
  br label %36

31:                                               ; preds = %24
  br label %32

32:                                               ; preds = %31
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.PQnode, ptr %33, i32 0, i32 2
  %35 = load ptr, ptr %34, align 8, !tbaa !15
  store ptr %35, ptr %5, align 8, !tbaa !5
  br label %16, !llvm.loop !16

36:                                               ; preds = %30, %16
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.PQnode, ptr %38, i32 0, i32 2
  store ptr %37, ptr %39, align 8, !tbaa !15
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.PQnode, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !18
  %43 = load ptr, ptr %6, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.PQnode, ptr %43, i32 0, i32 1
  store ptr %42, ptr %44, align 8, !tbaa !18
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  %46 = load ptr, ptr %5, align 8, !tbaa !5
  %47 = getelementptr inbounds %struct.PQnode, ptr %46, i32 0, i32 1
  %48 = load ptr, ptr %47, align 8, !tbaa !18
  %49 = getelementptr inbounds %struct.PQnode, ptr %48, i32 0, i32 2
  store ptr %45, ptr %49, align 8, !tbaa !15
  %50 = load ptr, ptr %6, align 8, !tbaa !5
  %51 = load ptr, ptr %5, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.PQnode, ptr %51, i32 0, i32 1
  store ptr %50, ptr %52, align 8, !tbaa !18
  %53 = load ptr, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret ptr %53
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 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 }
attributes #4 = { nounwind allocsize(0) }

!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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"PQnode", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!14, !6, i64 0}
!14 = !{!"pq", !6, i64 0, !6, i64 8}
!15 = !{!12, !6, i64 16}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = !{!12, !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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local noundef ptr @PQinsert(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #2
  store i32 %1, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %0, align 8, !tbaa !11
  %5 = getelementptr inbounds i8, ptr %4, i64 16
  %6 = load ptr, ptr %5, align 8, !tbaa !13
  br label %7

7:                                                ; preds = %10, %2
  %.0 = phi ptr [ %6, %2 ], [ %9, %10 ]
  %8 = getelementptr inbounds i8, ptr %.0, i64 16
  %9 = load ptr, ptr %8, align 8, !tbaa !13
  %.not = icmp eq ptr %9, %4
  br i1 %.not, label %13, label %10

10:                                               ; preds = %7
  %11 = load i32, ptr %.0, align 8, !tbaa !5
  %12 = icmp slt i32 %11, %1
  br i1 %12, label %13, label %7, !llvm.loop !14

13:                                               ; preds = %10, %7
  %14 = getelementptr inbounds i8, ptr %3, i64 16
  store ptr %.0, ptr %14, align 8, !tbaa !13
  %15 = getelementptr inbounds i8, ptr %.0, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !16
  %17 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr %16, ptr %17, align 8, !tbaa !16
  %18 = getelementptr inbounds i8, ptr %16, i64 16
  store ptr %3, ptr %18, align 8, !tbaa !13
  store ptr %3, ptr %15, align 8, !tbaa !16
  ret ptr %3
}

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(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 = { nofree 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 allocsize(0) }

!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 = !{!"PQnode", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"pq", !10, i64 0, !10, i64 8}
!13 = !{!6, !10, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!6, !10, i64 8}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass