; LLVM IR from freddiev4/dailyprogrammerchallenges :: Easy Challenges/Challenge 0053 Easy/solutions (solution)

; 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
define dso_local ptr @mergeAndSort(i32 noundef %0, ptr noundef %1, i32 noundef %2, ptr noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !5
  store ptr %3, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = load i32, ptr %7, align 4, !tbaa !5
  %15 = add nsw i32 %13, %14
  %16 = sext i32 %15 to i64
  %17 = mul i64 %16, 4
  %18 = call noalias ptr @malloc(i64 noundef %17) #4
  store ptr %18, ptr %9, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  store i32 0, ptr %11, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #3
  store i32 0, ptr %12, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %69, %4
  %20 = load i32, ptr %12, align 4, !tbaa !5
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = load i32, ptr %7, align 4, !tbaa !5
  %23 = add nsw i32 %21, %22
  %24 = icmp slt i32 %20, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #3
  br label %72

26:                                               ; preds = %19
  %27 = load ptr, ptr %6, align 8, !tbaa !9
  %28 = load i32, ptr %10, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i32, ptr %27, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = load ptr, ptr %8, align 8, !tbaa !9
  %33 = load i32, ptr %11, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds i32, ptr %32, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = icmp sle i32 %31, %36
  br i1 %37, label %38, label %42

38:                                               ; preds = %26
  %39 = load i32, ptr %10, align 4, !tbaa !5
  %40 = load i32, ptr %5, align 4, !tbaa !5
  %41 = icmp slt i32 %39, %40
  br i1 %41, label %46, label %42

42:                                               ; preds = %38, %26
  %43 = load i32, ptr %11, align 4, !tbaa !5
  %44 = load i32, ptr %7, align 4, !tbaa !5
  %45 = icmp eq i32 %43, %44
  br i1 %45, label %46, label %57

46:                                               ; preds = %42, %38
  %47 = load ptr, ptr %6, align 8, !tbaa !9
  %48 = load i32, ptr %10, align 4, !tbaa !5
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %10, align 4, !tbaa !5
  %50 = sext i32 %48 to i64
  %51 = getelementptr inbounds i32, ptr %47, i64 %50
  %52 = load i32, ptr %51, align 4, !tbaa !5
  %53 = load ptr, ptr %9, align 8, !tbaa !9
  %54 = load i32, ptr %12, align 4, !tbaa !5
  %55 = sext i32 %54 to i64
  %56 = getelementptr inbounds i32, ptr %53, i64 %55
  store i32 %52, ptr %56, align 4, !tbaa !5
  br label %68

57:                                               ; preds = %42
  %58 = load ptr, ptr %8, align 8, !tbaa !9
  %59 = load i32, ptr %11, align 4, !tbaa !5
  %60 = add nsw i32 %59, 1
  store i32 %60, ptr %11, align 4, !tbaa !5
  %61 = sext i32 %59 to i64
  %62 = getelementptr inbounds i32, ptr %58, i64 %61
  %63 = load i32, ptr %62, align 4, !tbaa !5
  %64 = load ptr, ptr %9, align 8, !tbaa !9
  %65 = load i32, ptr %12, align 4, !tbaa !5
  %66 = sext i32 %65 to i64
  %67 = getelementptr inbounds i32, ptr %64, i64 %66
  store i32 %63, ptr %67, align 4, !tbaa !5
  br label %68

68:                                               ; preds = %57, %46
  br label %69

69:                                               ; preds = %68
  %70 = load i32, ptr %12, align 4, !tbaa !5
  %71 = add nsw i32 %70, 1
  store i32 %71, ptr %12, align 4, !tbaa !5
  br label %19, !llvm.loop !11

72:                                               ; preds = %25
  %73 = load ptr, ptr %9, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  ret ptr %73
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; 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 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 #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 = !{!"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"

; Function Attrs: nofree nounwind memory(write, argmem: read, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @mergeAndSort(i32 noundef %0, ptr nocapture noundef readonly %1, i32 noundef %2, ptr nocapture noundef readonly %3) local_unnamed_addr #0 {
  %5 = add nsw i32 %2, %0
  %6 = sext i32 %5 to i64
  %7 = shl nsw i64 %6, 2
  %8 = tail call noalias ptr @malloc(i64 noundef %7) #2
  %9 = icmp sgt i32 %5, 0
  br i1 %9, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %wide.trip.count = zext nneg i32 %5 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %4
  ret ptr %8

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %.02227 = phi i32 [ 0, %.lr.ph.preheader ], [ %.1, %.lr.ph ]
  %.02326 = phi i32 [ 0, %.lr.ph.preheader ], [ %.124, %.lr.ph ]
  %10 = zext nneg i32 %.02326 to i64
  %11 = getelementptr inbounds i32, ptr %1, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = zext nneg i32 %.02227 to i64
  %14 = getelementptr inbounds i32, ptr %3, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %.not = icmp sle i32 %12, %15
  %16 = icmp slt i32 %.02326, %0
  %or.cond = and i1 %.not, %16
  %17 = icmp eq i32 %.02227, %2
  %or.cond25 = or i1 %or.cond, %17
  %.sink = select i1 %or.cond25, i32 %12, i32 %15
  %18 = zext i1 %or.cond25 to i32
  %.124 = add nuw nsw i32 %.02326, %18
  %not.or.cond25 = xor i1 %or.cond25, true
  %19 = zext i1 %not.or.cond25 to i32
  %.1 = add nuw nsw i32 %.02227, %19
  %20 = getelementptr inbounds i32, ptr %8, i64 %indvars.iv
  store i32 %.sink, ptr %20, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

attributes #0 = { nofree nounwind memory(write, argmem: read, inaccessiblemem: readwrite) 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 = { 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 #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, !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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass