; LLVM IR from Dev-XYS/Algorithms :: Fenwick-Tree.ll (Z10build_treei)

; 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"

@D = external dso_local global [1050 x i32], align 16
@T = external dso_local global [1050 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z10build_treei(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 1, ptr %3, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %38, %1
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = icmp sle i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %41

11:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sub nsw i32 0, %14
  %16 = and i32 %13, %15
  %17 = sub nsw i32 %12, %16
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %5, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %34, %11
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = icmp sle i32 %20, %21
  br i1 %22, label %24, label %23

23:                                               ; preds = %19
  store i32 5, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %37

24:                                               ; preds = %19
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [1050 x i32], ptr @D, i64 0, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [1050 x i32], ptr @T, i64 0, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = add nsw i32 %32, %28
  store i32 %33, ptr %31, align 4, !tbaa !5
  br label %34

34:                                               ; preds = %24
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %5, align 4, !tbaa !5
  br label %19, !llvm.loop !9

37:                                               ; preds = %23
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %3, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %3, align 4, !tbaa !5
  br label %6, !llvm.loop !11

41:                                               ; preds = %10
  ret void
}

; 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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@D = external dso_local local_unnamed_addr global [1050 x i32], align 16
@T = external dso_local local_unnamed_addr global [1050 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z10build_treei(i32 noundef %0) local_unnamed_addr #0 {
  %.not16 = icmp slt i32 %0, 1
  br i1 %.not16, label %._crit_edge20, label %.lr.ph19.preheader

.lr.ph19.preheader:                               ; preds = %1
  %2 = add nuw i32 %0, 1
  %wide.trip.count = zext i32 %2 to i64
  br label %.lr.ph19

._crit_edge20:                                    ; preds = %16, %1
  ret void

.lr.ph19:                                         ; preds = %.lr.ph19.preheader, %16
  %indvars.iv22 = phi i64 [ 1, %.lr.ph19.preheader ], [ %indvars.iv.next23, %16 ]
  %.not12 = add nuw i64 %indvars.iv22, 2147483647
  %3 = and i64 %.not12, %indvars.iv22
  %4 = and i64 %3, 4294967294
  %.not1314.not.not = icmp eq i64 %4, %indvars.iv22
  br i1 %.not1314.not.not, label %16, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph19
  %5 = getelementptr inbounds [1050 x i32], ptr @T, i64 0, i64 %indvars.iv22
  %.promoted = load i32, ptr %5, align 4, !tbaa !5
  %6 = or disjoint i64 %4, 1
  %7 = or disjoint i64 %4, 1
  %umax = tail call i64 @llvm.umax.i64(i64 %indvars.iv22, i64 %7)
  %8 = sub nsw i64 %umax, %4
  %min.iters.check = icmp ult i64 %8, 8
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.ph

scalar.ph.preheader:                              ; preds = %middle.block, %.lr.ph
  %indvars.iv.ph = phi i64 [ %6, %.lr.ph ], [ %ind.end, %middle.block ]
  %.ph = phi i32 [ %.promoted, %.lr.ph ], [ %15, %middle.block ]
  br label %scalar.ph

vector.ph:                                        ; preds = %.lr.ph
  %n.vec = and i64 %8, -8
  %ind.end = add i64 %6, %n.vec
  %9 = insertelement <4 x i32> <i32 poison, i32 0, i32 0, i32 0>, i32 %.promoted, 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> [ %9, %vector.ph ], [ %12, %vector.body ]
  %vec.phi26 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %13, %vector.body ]
  %offset.idx = add i64 %6, %index
  %10 = getelementptr inbounds [1050 x i32], ptr @D, i64 0, i64 %offset.idx
  %11 = getelementptr inbounds i8, ptr %10, i64 16
  %wide.load = load <4 x i32>, ptr %10, align 4, !tbaa !5
  %wide.load27 = load <4 x i32>, ptr %11, align 4, !tbaa !5
  %12 = add <4 x i32> %vec.phi, %wide.load
  %13 = add <4 x i32> %vec.phi26, %wide.load27
  %index.next = add nuw i64 %index, 8
  %14 = icmp eq i64 %index.next, %n.vec
  br i1 %14, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %13, %12
  %15 = tail call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %8, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %scalar.ph.preheader

._crit_edge:                                      ; preds = %scalar.ph, %middle.block
  %.lcssa = phi i32 [ %15, %middle.block ], [ %20, %scalar.ph ]
  store i32 %.lcssa, ptr %5, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %._crit_edge, %.lr.ph19
  %indvars.iv.next23 = add nuw nsw i64 %indvars.iv22, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next23, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge20, label %.lr.ph19, !llvm.loop !13

scalar.ph:                                        ; preds = %scalar.ph.preheader, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %scalar.ph ], [ %indvars.iv.ph, %scalar.ph.preheader ]
  %17 = phi i32 [ %20, %scalar.ph ], [ %.ph, %scalar.ph.preheader ]
  %18 = getelementptr inbounds [1050 x i32], ptr @D, i64 0, i64 %indvars.iv
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = add nsw i32 %17, %19
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %.not13.not = icmp ult i64 %indvars.iv, %indvars.iv22
  br i1 %.not13.not, label %scalar.ph, label %._crit_edge, !llvm.loop !14
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.umax.i64(i64, i64) #1

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

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) 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++ 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}
!14 = distinct !{!14, !10, !12, !11}


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