; 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: 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 void @PQchange(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %8 = load i32, ptr %6, align 4, !tbaa !9
  %9 = load ptr, ptr %5, 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 %5, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.PQnode, ptr %11, i32 0, i32 1
  %13 = load ptr, ptr %12, align 8, !tbaa !13
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.PQnode, ptr %14, i32 0, i32 2
  %16 = load ptr, ptr %15, align 8, !tbaa !14
  %17 = getelementptr inbounds %struct.PQnode, ptr %16, i32 0, i32 1
  store ptr %13, ptr %17, align 8, !tbaa !13
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.PQnode, ptr %18, i32 0, i32 2
  %20 = load ptr, ptr %19, align 8, !tbaa !14
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.PQnode, ptr %21, i32 0, i32 1
  %23 = load ptr, ptr %22, align 8, !tbaa !13
  %24 = getelementptr inbounds %struct.PQnode, ptr %23, i32 0, i32 2
  store ptr %20, ptr %24, align 8, !tbaa !14
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.pq, ptr %25, i32 0, i32 0
  %27 = load ptr, ptr %26, align 8, !tbaa !15
  %28 = getelementptr inbounds %struct.PQnode, ptr %27, i32 0, i32 2
  %29 = load ptr, ptr %28, align 8, !tbaa !14
  store ptr %29, ptr %7, align 8, !tbaa !5
  br label %30

30:                                               ; preds = %48, %3
  %31 = load ptr, ptr %7, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.PQnode, ptr %31, i32 0, i32 2
  %33 = load ptr, ptr %32, align 8, !tbaa !14
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.pq, ptr %34, i32 0, i32 0
  %36 = load ptr, ptr %35, align 8, !tbaa !15
  %37 = icmp ne ptr %33, %36
  br i1 %37, label %38, label %52

38:                                               ; preds = %30
  %39 = load ptr, ptr %7, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.PQnode, ptr %39, i32 0, i32 0
  %41 = load i32, ptr %40, align 8, !tbaa !11
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.PQnode, ptr %42, i32 0, i32 0
  %44 = load i32, ptr %43, align 8, !tbaa !11
  %45 = icmp slt i32 %41, %44
  br i1 %45, label %46, label %47

46:                                               ; preds = %38
  br label %52

47:                                               ; preds = %38
  br label %48

48:                                               ; preds = %47
  %49 = load ptr, ptr %7, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.PQnode, ptr %49, i32 0, i32 2
  %51 = load ptr, ptr %50, align 8, !tbaa !14
  store ptr %51, ptr %7, align 8, !tbaa !5
  br label %30, !llvm.loop !17

52:                                               ; preds = %46, %30
  %53 = load ptr, ptr %7, align 8, !tbaa !5
  %54 = load ptr, ptr %5, align 8, !tbaa !5
  %55 = getelementptr inbounds %struct.PQnode, ptr %54, i32 0, i32 2
  store ptr %53, ptr %55, align 8, !tbaa !14
  %56 = load ptr, ptr %7, align 8, !tbaa !5
  %57 = getelementptr inbounds %struct.PQnode, ptr %56, i32 0, i32 1
  %58 = load ptr, ptr %57, align 8, !tbaa !13
  %59 = load ptr, ptr %5, align 8, !tbaa !5
  %60 = getelementptr inbounds %struct.PQnode, ptr %59, i32 0, i32 1
  store ptr %58, ptr %60, align 8, !tbaa !13
  %61 = load ptr, ptr %5, align 8, !tbaa !5
  %62 = load ptr, ptr %7, align 8, !tbaa !5
  %63 = getelementptr inbounds %struct.PQnode, ptr %62, i32 0, i32 1
  %64 = load ptr, ptr %63, align 8, !tbaa !13
  %65 = getelementptr inbounds %struct.PQnode, ptr %64, i32 0, i32 2
  store ptr %61, ptr %65, align 8, !tbaa !14
  %66 = load ptr, ptr %5, align 8, !tbaa !5
  %67 = load ptr, ptr %7, align 8, !tbaa !5
  %68 = getelementptr inbounds %struct.PQnode, ptr %67, i32 0, i32 1
  store ptr %66, ptr %68, align 8, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !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 = !{!12, !6, i64 8}
!14 = !{!12, !6, i64 16}
!15 = !{!16, !6, i64 0}
!16 = !{!"pq", !6, i64 0, !6, i64 8}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}


; 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: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @PQchange(ptr nocapture noundef readonly %0, ptr noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  store i32 %2, ptr %1, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %1, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !11
  %6 = getelementptr inbounds i8, ptr %1, i64 16
  %7 = load ptr, ptr %6, align 8, !tbaa !12
  %8 = getelementptr inbounds i8, ptr %7, i64 8
  store ptr %5, ptr %8, align 8, !tbaa !11
  %9 = getelementptr inbounds i8, ptr %5, i64 16
  store ptr %7, ptr %9, align 8, !tbaa !12
  %10 = load ptr, ptr %0, align 8, !tbaa !13
  %11 = getelementptr inbounds i8, ptr %10, i64 16
  %12 = load ptr, ptr %11, align 8, !tbaa !12
  br label %13

13:                                               ; preds = %16, %3
  %.0 = phi ptr [ %12, %3 ], [ %15, %16 ]
  %14 = getelementptr inbounds i8, ptr %.0, i64 16
  %15 = load ptr, ptr %14, align 8, !tbaa !12
  %.not = icmp eq ptr %15, %10
  br i1 %.not, label %19, label %16

16:                                               ; preds = %13
  %17 = load i32, ptr %.0, align 8, !tbaa !5
  %18 = icmp slt i32 %17, %2
  br i1 %18, label %19, label %13, !llvm.loop !15

19:                                               ; preds = %16, %13
  store ptr %.0, ptr %6, align 8, !tbaa !12
  %20 = getelementptr inbounds i8, ptr %.0, i64 8
  %21 = load ptr, ptr %20, align 8, !tbaa !11
  store ptr %21, ptr %4, align 8, !tbaa !11
  %22 = getelementptr inbounds i8, ptr %21, i64 16
  store ptr %1, ptr %22, align 8, !tbaa !12
  store ptr %1, ptr %20, align 8, !tbaa !11
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) 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" }

!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 = !{!6, !10, i64 8}
!12 = !{!6, !10, i64 16}
!13 = !{!14, !10, i64 0}
!14 = !{!"pq", !10, i64 0, !10, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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