; LLVM IR from Om-Doiphode/Image_Pipeline :: src/auto_white_balance.ll (Z15averageOfPixelsSt6vectorIS_IdSaIdEESaIS1_EE)

; 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: mustprogress nounwind uwtable
define dso_local noundef double @_Z15averageOfPixelsSt6vectorIS_IdSaIdEESaIS1_EE(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca double, align 8
  %4 = alloca double, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store double 0.000000e+00, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !11
  br label %9

9:                                                ; preds = %39, %1
  %10 = load i32, ptr %6, align 4, !tbaa !11
  %11 = sext i32 %10 to i64
  %12 = call noundef i64 @_ZNKSt6vectorIS_IdSaIdEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #2
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %9
  store i32 2, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %42

15:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !11
  br label %16

16:                                               ; preds = %35, %15
  %17 = load i32, ptr %8, align 4, !tbaa !11
  %18 = sext i32 %17 to i64
  %19 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IdSaIdEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 0) #2
  %20 = call noundef i64 @_ZNKSt6vectorIdSaIdEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %19) #2
  %21 = icmp ult i64 %18, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %16
  store i32 5, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %38

23:                                               ; preds = %16
  %24 = load i32, ptr %6, align 4, !tbaa !11
  %25 = sext i32 %24 to i64
  %26 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IdSaIdEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %25) #2
  %27 = load i32, ptr %8, align 4, !tbaa !11
  %28 = sext i32 %27 to i64
  %29 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %26, i64 noundef %28) #2
  %30 = load double, ptr %29, align 8, !tbaa !9
  %31 = load double, ptr %4, align 8, !tbaa !9
  %32 = fadd double %31, %30
  store double %32, ptr %4, align 8, !tbaa !9
  %33 = load i32, ptr %5, align 4, !tbaa !11
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %5, align 4, !tbaa !11
  br label %35

35:                                               ; preds = %23
  %36 = load i32, ptr %8, align 4, !tbaa !11
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %8, align 4, !tbaa !11
  br label %16, !llvm.loop !13

38:                                               ; preds = %22
  br label %39

39:                                               ; preds = %38
  %40 = load i32, ptr %6, align 4, !tbaa !11
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %6, align 4, !tbaa !11
  br label %9, !llvm.loop !15

42:                                               ; preds = %14
  %43 = load double, ptr %4, align 8, !tbaa !9
  %44 = load i32, ptr %5, align 4, !tbaa !11
  %45 = sitofp i32 %44 to double
  %46 = fdiv double %43, %45
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret double %46
}

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIS_IdSaIdEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IdSaIdEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIdSaIdEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #0 align 2

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

attributes #0 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"double", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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: mustprogress nounwind uwtable
define dso_local noundef double @_Z15averageOfPixelsSt6vectorIS_IdSaIdEESaIS1_EE(ptr noundef nonnull %0) local_unnamed_addr #0 {
  %2 = tail call noundef i64 @_ZNKSt6vectorIS_IdSaIdEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #1
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %._crit_edge22, label %.preheader

.preheader:                                       ; preds = %1, %._crit_edge
  %indvars.iv28 = phi i64 [ %indvars.iv.next29, %._crit_edge ], [ 0, %1 ]
  %.01020 = phi i32 [ %.1.lcssa, %._crit_edge ], [ 0, %1 ]
  %.01119 = phi double [ %.112.lcssa, %._crit_edge ], [ 0.000000e+00, %1 ]
  %3 = tail call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IdSaIdEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 0) #1
  %4 = tail call noundef i64 @_ZNKSt6vectorIdSaIdEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %3) #1
  %.not25 = icmp eq i64 %4, 0
  br i1 %.not25, label %._crit_edge, label %.lr.ph

._crit_edge22.loopexit:                           ; preds = %._crit_edge
  %5 = sitofp i32 %.1.lcssa to double
  %6 = fdiv double %.112.lcssa, %5
  br label %._crit_edge22

._crit_edge22:                                    ; preds = %._crit_edge22.loopexit, %1
  %7 = phi double [ 0x7FF8000000000000, %1 ], [ %6, %._crit_edge22.loopexit ]
  ret double %7

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.112.lcssa = phi double [ %.01119, %.preheader ], [ %13, %.lr.ph ]
  %.1.lcssa = phi i32 [ %.01020, %.preheader ], [ %14, %.lr.ph ]
  %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
  %8 = tail call noundef i64 @_ZNKSt6vectorIS_IdSaIdEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #1
  %9 = icmp ugt i64 %8, %indvars.iv.next29
  br i1 %9, label %.preheader, label %._crit_edge22.loopexit, !llvm.loop !5

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.preheader ]
  %.116 = phi i32 [ %14, %.lr.ph ], [ %.01020, %.preheader ]
  %.11215 = phi double [ %13, %.lr.ph ], [ %.01119, %.preheader ]
  %10 = tail call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IdSaIdEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %indvars.iv28) #1
  %11 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %10, i64 noundef %indvars.iv) #1
  %12 = load double, ptr %11, align 8, !tbaa !7
  %13 = fadd double %.11215, %12
  %14 = add nsw i32 %.116, 1
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %15 = tail call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IdSaIdEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 0) #1
  %16 = tail call noundef i64 @_ZNKSt6vectorIdSaIdEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %15) #1
  %17 = icmp ugt i64 %16, %indvars.iv.next
  br i1 %17, label %.lr.ph, label %._crit_edge, !llvm.loop !11
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIS_IdSaIdEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IdSaIdEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIdSaIdEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

attributes #0 = { mustprogress 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 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"double", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = distinct !{!11, !6}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass