; LLVM IR from bqi343/cp-notebook :: Contests/USACO Solutions/2016-17/Feb 2017/Plat/17 Feb P2 (Segtree).ll (Z3updii)

; 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"

@seg = external dso_local global [262144 x i32], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3updii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = add nsw i32 %5, 131072
  store i32 %6, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %9
  store i32 %7, ptr %10, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %14, %2
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, 1
  br i1 %13, label %14, label %31

14:                                               ; preds = %11
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = sdiv i32 %15, 2
  store i32 %16, ptr %3, align 4, !tbaa !5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = mul nsw i32 2, %17
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %19
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = mul nsw i32 2, %21
  %23 = add nsw i32 %22, 1
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %24
  %26 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %20, ptr noundef nonnull align 4 dereferenceable(4) %25)
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %29
  store i32 %27, ptr %30, align 4, !tbaa !5
  br label %11, !llvm.loop !9

31:                                               ; preds = %11
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #1

attributes #0 = { 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 #1 = { inlinehint 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" }

!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"}


; 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"

@seg = external dso_local global [262144 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3updii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = add nsw i32 %0, 131072
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %4
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = icmp sgt i32 %0, -131071
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.08 = phi i32 [ %7, %.lr.ph ], [ %3, %2 ]
  %7 = lshr i32 %.08, 1
  %8 = and i32 %.08, 2147483646
  %9 = zext nneg i32 %8 to i64
  %10 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %9
  %11 = or i32 %.08, 1
  %12 = zext nneg i32 %11 to i64
  %13 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %12
  %14 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %10, ptr noundef nonnull align 4 dereferenceable(4) %13)
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = zext nneg i32 %7 to i64
  %17 = getelementptr inbounds [262144 x i32], ptr @seg, i64 0, i64 %16
  store i32 %15, ptr %17, align 4, !tbaa !5
  %18 = icmp ugt i32 %.08, 3
  br i1 %18, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %2
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #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 = { inlinehint 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" }

!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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass