; LLVM IR from codemistic/Data-Structures-and-Algorithms :: Arrays (20_Single_Missing_Value_in_a_sorted_array_M2)

; 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"

%struct.Array = type { [20 x i32], i32, i32 }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @MissingValue(ptr noundef byval(%struct.Array) align 8 %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %29, %1
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = getelementptr inbounds %struct.Array, ptr %0, i32 0, i32 1
  %9 = load i32, ptr %8, align 8, !tbaa !9
  %10 = icmp slt i32 %7, %9
  br i1 %10, label %11, label %32

11:                                               ; preds = %6
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = getelementptr inbounds %struct.Array, ptr %0, i32 0, i32 0
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [20 x i32], ptr %13, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = add nsw i32 %12, %17
  store i32 %18, ptr %3, align 4, !tbaa !5
  %19 = getelementptr inbounds %struct.Array, ptr %0, i32 0, i32 1
  %20 = load i32, ptr %19, align 8, !tbaa !9
  %21 = getelementptr inbounds %struct.Array, ptr %0, i32 0, i32 1
  %22 = load i32, ptr %21, align 8, !tbaa !9
  %23 = add nsw i32 %22, 1
  %24 = mul nsw i32 %20, %23
  %25 = sdiv i32 %24, 2
  store i32 %25, ptr %4, align 4, !tbaa !5
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = sub nsw i32 %26, %27
  store i32 %28, ptr %5, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %11
  %30 = load i32, ptr %2, align 4, !tbaa !5
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %2, align 4, !tbaa !5
  br label %6, !llvm.loop !11

32:                                               ; preds = %6
  %33 = load i32, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  ret i32 %33
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 80}
!10 = !{!"Array", !7, i64 0, !6, i64 80, !6, i64 84}
!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"

%struct.Array = type { [20 x i32], i32, i32 }

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @MissingValue(ptr nocapture noundef readonly byval(%struct.Array) align 8 %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 80
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph.preheader, label %18

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = zext nneg i32 %3 to i64
  %min.iters.check = icmp ult i32 %3, 8
  br i1 %min.iters.check, label %.lr.ph.preheader17, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483640
  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> [ zeroinitializer, %vector.ph ], [ %7, %vector.body ]
  %vec.phi15 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %8, %vector.body ]
  %5 = getelementptr inbounds [20 x i32], ptr %0, i64 0, i64 %index
  %6 = getelementptr inbounds i8, ptr %5, i64 16
  %wide.load = load <4 x i32>, ptr %5, align 8, !tbaa !10
  %wide.load16 = load <4 x i32>, ptr %6, align 8, !tbaa !10
  %7 = add <4 x i32> %wide.load, %vec.phi
  %8 = add <4 x i32> %wide.load16, %vec.phi15
  %index.next = add nuw i64 %index, 8
  %9 = icmp eq i64 %index.next, %n.vec
  br i1 %9, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %8, %7
  %10 = 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.ph.preheader17

.lr.ph.preheader17:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %.0810.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %10, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader17, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader17 ]
  %.0810 = phi i32 [ %13, %.lr.ph ], [ %.0810.ph, %.lr.ph.preheader17 ]
  %11 = getelementptr inbounds [20 x i32], ptr %0, i64 0, i64 %indvars.iv
  %12 = load i32, ptr %11, align 4, !tbaa !10
  %13 = add nsw i32 %12, %.0810
  %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 !15

._crit_edge:                                      ; preds = %.lr.ph, %middle.block
  %.lcssa = phi i32 [ %10, %middle.block ], [ %13, %.lr.ph ]
  %14 = add nuw nsw i32 %3, 1
  %15 = mul nuw nsw i32 %14, %3
  %16 = lshr i32 %15, 1
  %17 = sub nsw i32 %16, %.lcssa
  br label %18

18:                                               ; preds = %._crit_edge, %1
  %.0.lcssa = phi i32 [ %17, %._crit_edge ], [ undef, %1 ]
  ret i32 %.0.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, !9, i64 80}
!6 = !{!"Array", !7, i64 0, !9, i64 80, !9, i64 84}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!9, !9, i64 0}
!11 = distinct !{!11, !12, !13, !14}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!"llvm.loop.isvectorized", i32 1}
!14 = !{!"llvm.loop.unroll.runtime.disable"}
!15 = distinct !{!15, !12, !14, !13}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass