; LLVM IR from amritansh22/Data-Structures-and-Algorithms-in-cpp :: SortingAlgorithms/heap_sort.ll (Z8heapsortPii)

; 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"

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z10maxheapifyPiii(ptr noundef, i32 noundef, i32 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: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8heapsortPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  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 4, ptr %5) #3
  %6 = load i32, ptr %4, align 4, !tbaa !9
  %7 = sdiv i32 %6, 2
  %8 = sub nsw i32 %7, 1
  store i32 %8, ptr %5, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %16, %2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = icmp sge i32 %10, 0
  br i1 %11, label %12, label %19

12:                                               ; preds = %9
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !9
  %15 = load i32, ptr %5, align 4, !tbaa !9
  call void @_Z10maxheapifyPiii(ptr noundef %13, i32 noundef %14, i32 noundef %15)
  br label %16

16:                                               ; preds = %12
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = add nsw i32 %17, -1
  store i32 %18, ptr %5, align 4, !tbaa !9
  br label %9, !llvm.loop !11

19:                                               ; preds = %9
  %20 = load i32, ptr %4, align 4, !tbaa !9
  %21 = sub nsw i32 %20, 1
  store i32 %21, ptr %5, align 4, !tbaa !9
  br label %22

22:                                               ; preds = %34, %19
  %23 = load i32, ptr %5, align 4, !tbaa !9
  %24 = icmp sge i32 %23, 0
  br i1 %24, label %25, label %37

25:                                               ; preds = %22
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = getelementptr inbounds i32, ptr %26, i64 0
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = load i32, ptr %5, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  call void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4) %27, ptr noundef nonnull align 4 dereferenceable(4) %31) #3
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = load i32, ptr %5, align 4, !tbaa !9
  call void @_Z10maxheapifyPiii(ptr noundef %32, i32 noundef %33, i32 noundef 0)
  br label %34

34:                                               ; preds = %25
  %35 = load i32, ptr %5, align 4, !tbaa !9
  %36 = add nsw i32 %35, -1
  store i32 %36, ptr %5, align 4, !tbaa !9
  br label %22, !llvm.loop !13

37:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

attributes #0 = { mustprogress 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 = { inlinehint mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !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 uwtable
declare dso_local void @_Z10maxheapifyPiii(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8heapsortPii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %1, 1
  br i1 %3, label %.lr.ph.preheader, label %.preheader

.lr.ph.preheader:                                 ; preds = %2
  %4 = lshr i32 %1, 1
  br label %.lr.ph

.preheader:                                       ; preds = %.lr.ph, %2
  %5 = icmp sgt i32 %1, 0
  br i1 %5, label %.lr.ph15.preheader, label %._crit_edge

.lr.ph15.preheader:                               ; preds = %.preheader
  %6 = zext nneg i32 %1 to i64
  br label %.lr.ph15

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.0.in13 = phi i32 [ %.0, %.lr.ph ], [ %4, %.lr.ph.preheader ]
  %.0 = add nsw i32 %.0.in13, -1
  tail call void @_Z10maxheapifyPiii(ptr noundef %0, i32 noundef %1, i32 noundef %.0)
  %7 = icmp ugt i32 %.0.in13, 1
  br i1 %7, label %.lr.ph, label %.preheader, !llvm.loop !5

.lr.ph15:                                         ; preds = %.lr.ph15.preheader, %.lr.ph15
  %indvars.iv = phi i64 [ %6, %.lr.ph15.preheader ], [ %indvars.iv.next, %.lr.ph15 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %8 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  tail call void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4) %0, ptr noundef nonnull align 4 dereferenceable(4) %8) #2
  %9 = trunc nuw nsw i64 %indvars.iv.next to i32
  tail call void @_Z10maxheapifyPiii(ptr noundef nonnull %0, i32 noundef %9, i32 noundef 0)
  %10 = icmp ugt i64 %indvars.iv, 1
  br i1 %10, label %.lr.ph15, label %._crit_edge, !llvm.loop !7

._crit_edge:                                      ; preds = %.lr.ph15, %.preheader
  ret void
}

attributes #0 = { mustprogress 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 = { inlinehint mustprogress 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = distinct !{!7, !6}


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