; LLVM IR from bartobri/data-structures-c :: priority-queue/array-ordered (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"

@pq = external hidden global ptr, align 8
@N = external hidden global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local void @PQinsert(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load ptr, ptr @pq, align 8, !tbaa !9
  %7 = load i32, ptr @N, align 4, !tbaa !5
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr @N, align 4, !tbaa !5
  %9 = sext i32 %7 to i64
  %10 = getelementptr inbounds i32, ptr %6, i64 %9
  store i32 %5, ptr %10, align 4, !tbaa !5
  %11 = load i32, ptr @N, align 4, !tbaa !5
  %12 = sub nsw i32 %11, 1
  store i32 %12, ptr %3, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %53, %1
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = icmp sgt i32 %14, 0
  br i1 %15, label %16, label %56

16:                                               ; preds = %13
  %17 = load ptr, ptr @pq, align 8, !tbaa !9
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = load ptr, ptr @pq, align 8, !tbaa !9
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = sub nsw i32 %23, 1
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %22, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = icmp slt i32 %21, %27
  br i1 %28, label %29, label %51

29:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %30 = load ptr, ptr @pq, align 8, !tbaa !9
  %31 = load i32, ptr %3, align 4, !tbaa !5
  %32 = sub nsw i32 %31, 1
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i32, ptr %30, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !5
  store i32 %35, ptr %4, align 4, !tbaa !5
  %36 = load ptr, ptr @pq, align 8, !tbaa !9
  %37 = load i32, ptr %3, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i32, ptr %36, i64 %38
  %40 = load i32, ptr %39, align 4, !tbaa !5
  %41 = load ptr, ptr @pq, align 8, !tbaa !9
  %42 = load i32, ptr %3, align 4, !tbaa !5
  %43 = sub nsw i32 %42, 1
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds i32, ptr %41, i64 %44
  store i32 %40, ptr %45, align 4, !tbaa !5
  %46 = load i32, ptr %4, align 4, !tbaa !5
  %47 = load ptr, ptr @pq, align 8, !tbaa !9
  %48 = load i32, ptr %3, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds i32, ptr %47, i64 %49
  store i32 %46, ptr %50, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %52

51:                                               ; preds = %16
  br label %56

52:                                               ; preds = %29
  br label %53

53:                                               ; preds = %52
  %54 = load i32, ptr %3, align 4, !tbaa !5
  %55 = add nsw i32 %54, -1
  store i32 %55, ptr %3, align 4, !tbaa !5
  br label %13, !llvm.loop !11

56:                                               ; preds = %51, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

; 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

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@pq = external hidden local_unnamed_addr global ptr, align 8
@N = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @PQinsert(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr @pq, align 8, !tbaa !5
  %3 = load i32, ptr @N, align 4, !tbaa !9
  %4 = add nsw i32 %3, 1
  store i32 %4, ptr @N, align 4, !tbaa !9
  %5 = sext i32 %3 to i64
  %6 = getelementptr inbounds i32, ptr %2, i64 %5
  store i32 %0, ptr %6, align 4, !tbaa !9
  %7 = load i32, ptr @N, align 4, !tbaa !9
  %invariant.gep = getelementptr i8, ptr %2, i64 -8
  %8 = icmp sgt i32 %7, 1
  br i1 %8, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %15
  %.0.in13 = phi i32 [ %.014, %15 ], [ %7, %1 ]
  %.014 = add nsw i32 %.0.in13, -1
  %9 = zext nneg i32 %.014 to i64
  %10 = getelementptr inbounds i32, ptr %2, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !9
  %12 = zext nneg i32 %.0.in13 to i64
  %gep = getelementptr i32, ptr %invariant.gep, i64 %12
  %13 = load i32, ptr %gep, align 4, !tbaa !9
  %14 = icmp slt i32 %11, %13
  br i1 %14, label %15, label %._crit_edge

15:                                               ; preds = %.lr.ph
  store i32 %11, ptr %gep, align 4, !tbaa !9
  store i32 %13, ptr %10, align 4, !tbaa !9
  %16 = icmp ugt i32 %.0.in13, 2
  br i1 %16, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %15, %.lr.ph, %1
  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, !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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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