; LLVM IR from gargarchit/Data_Structure_n_Algorithms :: Array_Problems (1_Missing)

; 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 i32 @Missing_ele(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = 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 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %16, %2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = icmp sle i32 %9, %10
  br i1 %11, label %12, label %19

12:                                               ; preds = %8
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = load i32, ptr %6, align 4, !tbaa !9
  %15 = add nsw i32 %13, %14
  store i32 %15, ptr %5, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %12
  %17 = load i32, ptr %6, align 4, !tbaa !9
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %6, align 4, !tbaa !9
  br label %8, !llvm.loop !11

19:                                               ; preds = %8
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %20

20:                                               ; preds = %33, %19
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = sub nsw i32 %22, 1
  %24 = icmp slt i32 %21, %23
  br i1 %24, label %25, label %36

25:                                               ; preds = %20
  %26 = load i32, ptr %5, align 4, !tbaa !9
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i32, ptr %27, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !9
  %32 = sub nsw i32 %26, %31
  store i32 %32, ptr %5, align 4, !tbaa !9
  br label %33

33:                                               ; preds = %25
  %34 = load i32, ptr %6, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %6, align 4, !tbaa !9
  br label %20, !llvm.loop !13

36:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %37 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %37, ptr %7, align 4, !tbaa !9
  %38 = load i32, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %38
}

; 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 = !{!"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"}
!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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @Missing_ele(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not15 = icmp slt i32 %1, 1
  br i1 %.not15, label %._crit_edge, label %.preheader

.preheader:                                       ; preds = %2
  %3 = shl nuw i32 %1, 1
  %4 = add nsw i32 %1, -1
  %5 = zext nneg i32 %4 to i33
  %6 = add nsw i32 %1, -2
  %7 = zext i32 %6 to i33
  %8 = mul i33 %5, %7
  %9 = lshr i33 %8, 1
  %10 = trunc nuw i33 %9 to i32
  %11 = add i32 %3, %10
  %12 = add i32 %11, -1
  %.not = icmp eq i32 %1, 1
  br i1 %.not, label %._crit_edge, label %.lr.ph20.preheader

.lr.ph20.preheader:                               ; preds = %.preheader
  %wide.trip.count = zext nneg i32 %4 to i64
  %min.iters.check = icmp ult i32 %1, 9
  br i1 %min.iters.check, label %.lr.ph20.preheader28, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph20.preheader
  %n.vec = and i64 %wide.trip.count, 2147483640
  %13 = insertelement <4 x i32> <i32 poison, i32 0, i32 0, i32 0>, i32 %12, i64 0
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ %13, %vector.ph ], [ %16, %vector.body ]
  %vec.phi26 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %17, %vector.body ]
  %14 = getelementptr inbounds i32, ptr %0, i64 %index
  %15 = getelementptr inbounds i8, ptr %14, i64 16
  %wide.load = load <4 x i32>, ptr %14, align 4, !tbaa !5
  %wide.load27 = load <4 x i32>, ptr %15, align 4, !tbaa !5
  %16 = sub <4 x i32> %vec.phi, %wide.load
  %17 = sub <4 x i32> %vec.phi26, %wide.load27
  %index.next = add nuw i64 %index, 8
  %18 = icmp eq i64 %index.next, %n.vec
  br i1 %18, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %17, %16
  %19 = tail call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph20.preheader28

.lr.ph20.preheader28:                             ; preds = %middle.block, %.lr.ph20.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph20.preheader ], [ %n.vec, %middle.block ]
  %.119.ph = phi i32 [ %12, %.lr.ph20.preheader ], [ %19, %middle.block ]
  br label %.lr.ph20

.lr.ph20:                                         ; preds = %.lr.ph20.preheader28, %.lr.ph20
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph20 ], [ %indvars.iv.ph, %.lr.ph20.preheader28 ]
  %.119 = phi i32 [ %22, %.lr.ph20 ], [ %.119.ph, %.lr.ph20.preheader28 ]
  %20 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = sub nsw i32 %.119, %21
  %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.ph20, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph20, %middle.block, %2, %.preheader
  %.1.lcssa = phi i32 [ %12, %.preheader ], [ 0, %2 ], [ %19, %middle.block ], [ %22, %.lr.ph20 ]
  ret i32 %.1.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 speculatable willreturn memory(none) }

!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, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass