; LLVM IR from codemistic/Data-Structures-and-Algorithms :: CPP/Fenwick Tree/fenwickTree.ll (Z15constructBITreePii)

; 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: 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: mustprogress nounwind uwtable
declare dso_local void @_Z9updateBITPiiii(ptr noundef, i32 noundef, i32 noundef, i32 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_Z15constructBITreePii(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %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 8, ptr %5) #5
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = add nsw i32 %8, 1
  %10 = sext i32 %9 to i64
  %11 = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 %10, i64 4)
  %12 = extractvalue { i64, i1 } %11, 1
  %13 = extractvalue { i64, i1 } %11, 0
  %14 = select i1 %12, i64 -1, i64 %13
  %15 = call noalias noundef nonnull ptr @_Znam(i64 noundef %14) #6
  store ptr %15, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %26, %2
  %17 = load i32, ptr %6, align 4, !tbaa !9
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = icmp sle i32 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  br label %29

21:                                               ; preds = %16
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr %22, i64 %24
  store i32 0, ptr %25, align 4, !tbaa !9
  br label %26

26:                                               ; preds = %21
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %6, align 4, !tbaa !9
  br label %16, !llvm.loop !11

29:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %30

30:                                               ; preds = %44, %29
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = load i32, ptr %4, align 4, !tbaa !9
  %33 = icmp slt i32 %31, %32
  br i1 %33, label %35, label %34

34:                                               ; preds = %30
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  br label %47

35:                                               ; preds = %30
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  %37 = load i32, ptr %4, align 4, !tbaa !9
  %38 = load i32, ptr %7, align 4, !tbaa !9
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds i32, ptr %39, i64 %41
  %43 = load i32, ptr %42, align 4, !tbaa !9
  call void @_Z9updateBITPiiii(ptr noundef %36, i32 noundef %37, i32 noundef %38, i32 noundef %43)
  br label %44

44:                                               ; preds = %35
  %45 = load i32, ptr %7, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %7, align 4, !tbaa !9
  br label %30, !llvm.loop !13

47:                                               ; preds = %34
  %48 = load ptr, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  ret ptr %48
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare { i64, i1 } @llvm.umul.with.overflow.i64(i64, i64) #3

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) #4

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #4 = { nobuiltin 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 #5 = { nounwind }
attributes #6 = { builtin 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 = !{!"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}


; 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
declare dso_local void @_Z9updateBITPiiii(ptr noundef, i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef nonnull ptr @_Z15constructBITreePii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = add nsw i32 %1, 1
  %4 = zext nneg i32 %3 to i64
  %5 = icmp slt i32 %1, -1
  %6 = shl nuw nsw i64 %4, 2
  %7 = select i1 %5, i64 -1, i64 %6
  %8 = tail call noalias noundef nonnull ptr @_Znam(i64 noundef %7) #4
  %.not16 = icmp slt i32 %1, 1
  br i1 %.not16, label %._crit_edge, label %.lr.ph19.preheader

.lr.ph19.preheader:                               ; preds = %2
  %scevgep = getelementptr i8, ptr %8, i64 4
  %9 = zext nneg i32 %1 to i64
  %10 = shl nuw nsw i64 %9, 2
  tail call void @llvm.memset.p0.i64(ptr align 4 %scevgep, i8 0, i64 %10, i1 false), !tbaa !5
  %wide.trip.count = zext nneg i32 %1 to i64
  br label %.lr.ph19

._crit_edge:                                      ; preds = %.lr.ph19, %2
  ret ptr %8

.lr.ph19:                                         ; preds = %.lr.ph19.preheader, %.lr.ph19
  %indvars.iv = phi i64 [ 0, %.lr.ph19.preheader ], [ %indvars.iv.next, %.lr.ph19 ]
  %11 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @_Z9updateBITPiiii(ptr noundef nonnull %8, i32 noundef %1, i32 noundef %13, i32 noundef %12)
  %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.ph19, !llvm.loop !9
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) local_unnamed_addr #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

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 = { 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 = { nobuiltin 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #4 = { builtin 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass