; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 07. Sorting/09 Union of Two Sorted Arrays (09a Union of Two Sorted Arrays)

; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z11unionArraysPiS_ii(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca i64, align 8
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  %13 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  %14 = load i32, ptr %7, align 4, !tbaa !9
  %15 = load i32, ptr %8, align 4, !tbaa !9
  %16 = add nsw i32 %14, %15
  %17 = zext i32 %16 to i64
  %18 = call ptr @llvm.stacksave.p0()
  store ptr %18, ptr %9, align 8
  %19 = alloca i32, i64 %17, align 16
  store i64 %17, ptr %10, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #5
  store i32 0, ptr %11, align 4, !tbaa !9
  br label %20

20:                                               ; preds = %34, %4
  %21 = load i32, ptr %11, align 4, !tbaa !9
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = icmp slt i32 %21, %22
  br i1 %23, label %25, label %24

24:                                               ; preds = %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #5
  br label %37

25:                                               ; preds = %20
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load i32, ptr %11, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds i32, ptr %26, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !9
  %31 = load i32, ptr %11, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i32, ptr %19, i64 %32
  store i32 %30, ptr %33, align 4, !tbaa !9
  br label %34

34:                                               ; preds = %25
  %35 = load i32, ptr %11, align 4, !tbaa !9
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %11, align 4, !tbaa !9
  br label %20, !llvm.loop !11

37:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #5
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %38

38:                                               ; preds = %54, %37
  %39 = load i32, ptr %12, align 4, !tbaa !9
  %40 = load i32, ptr %8, align 4, !tbaa !9
  %41 = icmp slt i32 %39, %40
  br i1 %41, label %43, label %42

42:                                               ; preds = %38
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #5
  br label %57

43:                                               ; preds = %38
  %44 = load ptr, ptr %6, align 8, !tbaa !5
  %45 = load i32, ptr %12, align 4, !tbaa !9
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds i32, ptr %44, i64 %46
  %48 = load i32, ptr %47, align 4, !tbaa !9
  %49 = load i32, ptr %7, align 4, !tbaa !9
  %50 = load i32, ptr %12, align 4, !tbaa !9
  %51 = add nsw i32 %49, %50
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds i32, ptr %19, i64 %52
  store i32 %48, ptr %53, align 4, !tbaa !9
  br label %54

54:                                               ; preds = %43
  %55 = load i32, ptr %12, align 4, !tbaa !9
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %12, align 4, !tbaa !9
  br label %38, !llvm.loop !13

57:                                               ; preds = %42
  %58 = load i32, ptr %7, align 4, !tbaa !9
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i32, ptr %19, i64 %59
  %61 = load i32, ptr %8, align 4, !tbaa !9
  %62 = sext i32 %61 to i64
  %63 = getelementptr inbounds i32, ptr %60, i64 %62
  call void @_ZSt4sortIPiEvT_S1_(ptr noundef %19, ptr noundef %63)
  call void @llvm.lifetime.start.p0(i64 4, ptr %13) #5
  store i32 0, ptr %13, align 4, !tbaa !9
  br label %64

64:                                               ; preds = %96, %57
  %65 = load i32, ptr %13, align 4, !tbaa !9
  %66 = load i32, ptr %7, align 4, !tbaa !9
  %67 = load i32, ptr %8, align 4, !tbaa !9
  %68 = add nsw i32 %66, %67
  %69 = icmp slt i32 %65, %68
  br i1 %69, label %71, label %70

70:                                               ; preds = %64
  call void @llvm.lifetime.end.p0(i64 4, ptr %13) #5
  br label %99

71:                                               ; preds = %64
  %72 = load i32, ptr %13, align 4, !tbaa !9
  %73 = icmp eq i32 %72, 0
  br i1 %73, label %88, label %74

74:                                               ; preds = %71
  %75 = load i32, ptr %13, align 4, !tbaa !9
  %76 = icmp sgt i32 %75, 0
  br i1 %76, label %77, label %95

77:                                               ; preds = %74
  %78 = load i32, ptr %13, align 4, !tbaa !9
  %79 = sext i32 %78 to i64
  %80 = getelementptr inbounds i32, ptr %19, i64 %79
  %81 = load i32, ptr %80, align 4, !tbaa !9
  %82 = load i32, ptr %13, align 4, !tbaa !9
  %83 = sub nsw i32 %82, 1
  %84 = sext i32 %83 to i64
  %85 = getelementptr inbounds i32, ptr %19, i64 %84
  %86 = load i32, ptr %85, align 4, !tbaa !9
  %87 = icmp ne i32 %81, %86
  br i1 %87, label %88, label %95

88:                                               ; preds = %77, %71
  %89 = load i32, ptr %13, align 4, !tbaa !9
  %90 = sext i32 %89 to i64
  %91 = getelementptr inbounds i32, ptr %19, i64 %90
  %92 = load i32, ptr %91, align 4, !tbaa !9
  %93 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %92)
  %94 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %93, ptr noundef @.str)
  br label %95

95:                                               ; preds = %88, %77, %74
  br label %96

96:                                               ; preds = %95
  %97 = load i32, ptr %13, align 4, !tbaa !9
  %98 = add nsw i32 %97, 1
  store i32 %98, ptr %13, align 4, !tbaa !9
  br label %64, !llvm.loop !14

99:                                               ; preds = %70
  %100 = load ptr, ptr %9, align 8
  call void @llvm.stackrestore.p0(ptr %100)
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPiEvT_S1_(ptr noundef, ptr noundef) #3

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #3

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #1

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 }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { inlinehint 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 #4 = { "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 #5 = { 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}
!14 = distinct !{!14, !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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z11unionArraysPiS_ii(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = add i32 %3, %2
  %6 = zext i32 %5 to i64
  %7 = alloca i32, i64 %6, align 16
  %8 = icmp sgt i32 %2, 0
  br i1 %8, label %.lr.ph.preheader, label %.preheader

.lr.ph.preheader:                                 ; preds = %4
  %9 = zext nneg i32 %2 to i64
  %10 = shl nuw nsw i64 %9, 2
  call void @llvm.memcpy.p0.p0.i64(ptr nonnull align 16 %7, ptr align 4 %0, i64 %10, i1 false), !tbaa !5
  br label %.preheader

.preheader:                                       ; preds = %.lr.ph.preheader, %4
  %11 = icmp sgt i32 %3, 0
  %12 = sext i32 %2 to i64
  br i1 %11, label %.lr.ph32.preheader, label %._crit_edge

.lr.ph32.preheader:                               ; preds = %.preheader
  %13 = shl nsw i64 %12, 2
  %scevgep = getelementptr i8, ptr %7, i64 %13
  %14 = zext nneg i32 %3 to i64
  %15 = shl nuw nsw i64 %14, 2
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %scevgep, ptr align 4 %1, i64 %15, i1 false), !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %.preheader, %.lr.ph32.preheader
  %16 = getelementptr inbounds i32, ptr %7, i64 %12
  %17 = sext i32 %3 to i64
  %18 = getelementptr inbounds i32, ptr %16, i64 %17
  call void @_ZSt4sortIPiEvT_S1_(ptr noundef nonnull %7, ptr noundef nonnull %18)
  %19 = icmp sgt i32 %5, 0
  br i1 %19, label %20, label %._crit_edge36

20:                                               ; preds = %._crit_edge
  %.pre = load i32, ptr %7, align 16, !tbaa !5
  %21 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %.pre)
  %22 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %21, ptr noundef nonnull @.str)
  %exitcond.peel.not = icmp eq i32 %5, 1
  br i1 %exitcond.peel.not, label %._crit_edge36, label %.lr.ph35.peel.next

._crit_edge36:                                    ; preds = %30, %20, %._crit_edge
  ret void

.lr.ph35.peel.next:                               ; preds = %20, %30
  %indvars.iv = phi i64 [ %indvars.iv.next, %30 ], [ 1, %20 ]
  %23 = getelementptr inbounds i32, ptr %7, i64 %indvars.iv
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = getelementptr i8, ptr %23, i64 -4
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %.not = icmp eq i32 %24, %26
  br i1 %.not, label %30, label %27

27:                                               ; preds = %.lr.ph35.peel.next
  %28 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %24)
  %29 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %28, ptr noundef nonnull @.str)
  br label %30

30:                                               ; preds = %.lr.ph35.peel.next, %27
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %6
  br i1 %exitcond.not, label %._crit_edge36, label %.lr.ph35.peel.next, !llvm.loop !9
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPiEvT_S1_(ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #1

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

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 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 = { "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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }

!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++ TBAA"}
!9 = distinct !{!9, !10, !11}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.peeled.count", i32 1}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopFullUnrollPass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass