; LLVM IR from ahampriyanshu/algo-ds-101 :: Algorithms/Array (high-low-rearrangement)

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

; Function Attrs: nounwind uwtable
define dso_local void @rearrange(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) #2
  store i32 1, ptr %5, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %53, %2
  %7 = load i32, ptr %5, align 4, !tbaa !9
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %56

11:                                               ; preds = %6
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = sub nsw i32 %13, 1
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i32, ptr %12, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i32, ptr %18, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !9
  %23 = icmp sgt i32 %17, %22
  br i1 %23, label %24, label %29

24:                                               ; preds = %11
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load i32, ptr %5, align 4, !tbaa !9
  %27 = sub nsw i32 %26, 1
  %28 = load i32, ptr %5, align 4, !tbaa !9
  call void @swap(ptr noundef %25, i32 noundef %27, i32 noundef %28)
  br label %29

29:                                               ; preds = %24, %11
  %30 = load i32, ptr %5, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  %32 = load i32, ptr %4, align 4, !tbaa !9
  %33 = icmp slt i32 %31, %32
  br i1 %33, label %34, label %52

34:                                               ; preds = %29
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  %36 = load i32, ptr %5, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i32, ptr %35, i64 %38
  %40 = load i32, ptr %39, align 4, !tbaa !9
  %41 = load ptr, ptr %3, align 8, !tbaa !5
  %42 = load i32, ptr %5, align 4, !tbaa !9
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds i32, ptr %41, i64 %43
  %45 = load i32, ptr %44, align 4, !tbaa !9
  %46 = icmp sgt i32 %40, %45
  br i1 %46, label %47, label %52

47:                                               ; preds = %34
  %48 = load ptr, ptr %3, align 8, !tbaa !5
  %49 = load i32, ptr %5, align 4, !tbaa !9
  %50 = add nsw i32 %49, 1
  %51 = load i32, ptr %5, align 4, !tbaa !9
  call void @swap(ptr noundef %48, i32 noundef %50, i32 noundef %51)
  br label %52

52:                                               ; preds = %47, %34, %29
  br label %53

53:                                               ; preds = %52
  %54 = load i32, ptr %5, align 4, !tbaa !9
  %55 = add nsw i32 %54, 2
  store i32 %55, ptr %5, align 4, !tbaa !9
  br label %6, !llvm.loop !11

56:                                               ; preds = %10
  ret void
}

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 = !{!"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"}


; 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: nounwind uwtable
declare dso_local void @swap(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

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

.lr.ph.preheader:                                 ; preds = %2
  %4 = zext nneg i32 %1 to i64
  %invariant.gep = getelementptr i8, ptr %0, i64 -4
  br label %.lr.ph

._crit_edge:                                      ; preds = %21, %2
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %21
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next, %21 ]
  %indvars21 = trunc i64 %indvars.iv to i32
  %gep = getelementptr i32, ptr %invariant.gep, i64 %indvars.iv
  %5 = load i32, ptr %gep, align 4, !tbaa !5
  %6 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = icmp sgt i32 %5, %7
  br i1 %8, label %9, label %11

9:                                                ; preds = %.lr.ph
  %10 = add nsw i32 %indvars21, -1
  tail call void @swap(ptr noundef nonnull %0, i32 noundef %10, i32 noundef %indvars21)
  br label %11

11:                                               ; preds = %9, %.lr.ph
  %12 = add nuw nsw i64 %indvars.iv, 1
  %13 = add nuw nsw i32 %indvars21, 1
  %14 = icmp ult i64 %12, %4
  br i1 %14, label %15, label %21

15:                                               ; preds = %11
  %16 = getelementptr inbounds i32, ptr %0, i64 %12
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = load i32, ptr %6, align 4, !tbaa !5
  %19 = icmp sgt i32 %17, %18
  br i1 %19, label %20, label %21

20:                                               ; preds = %15
  tail call void @swap(ptr noundef nonnull %0, i32 noundef %13, i32 noundef %indvars21)
  br label %21

21:                                               ; preds = %11, %15, %20
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
  %22 = icmp ult i64 %indvars.iv.next, %4
  br i1 %22, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

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" }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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