; LLVM IR from tangjz/acm-icpc :: uvalive/5871.ll (Z3sumi)

; 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"

@t = external dso_local global i32, align 4
@tot = external dso_local global i32, align 4
@bit = external dso_local global [1000002 x i32], align 16
@vis = external dso_local global [1000002 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z3sumi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = 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 0, ptr %3, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %23, %1
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr @tot, align 4, !tbaa !5
  %7 = icmp sle i32 %5, %6
  br i1 %7, label %8, label %30

8:                                                ; preds = %4
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [1000002 x i32], ptr @vis, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = load i32, ptr @t, align 4, !tbaa !5
  %14 = icmp eq i32 %12, %13
  br i1 %14, label %15, label %22

15:                                               ; preds = %8
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [1000002 x i32], ptr @bit, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = add nsw i32 %20, %19
  store i32 %21, ptr %3, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %15, %8
  br label %23

23:                                               ; preds = %22
  %24 = load i32, ptr %2, align 4, !tbaa !5
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = sub nsw i32 0, %25
  %27 = and i32 %24, %26
  %28 = load i32, ptr %2, align 4, !tbaa !5
  %29 = add nsw i32 %28, %27
  store i32 %29, ptr %2, align 4, !tbaa !5
  br label %4, !llvm.loop !9

30:                                               ; preds = %4
  %31 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %31
}

; 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"}


; 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"

@t = external dso_local local_unnamed_addr global i32, align 4
@tot = external dso_local local_unnamed_addr global i32, align 4
@bit = external dso_local local_unnamed_addr global [1000002 x i32], align 16
@vis = external dso_local local_unnamed_addr global [1000002 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z3sumi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @tot, align 4, !tbaa !5
  %.not9 = icmp slt i32 %2, %0
  br i1 %.not9, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %3 = load i32, ptr @t, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %.lr.ph, %13
  %.011 = phi i32 [ 0, %.lr.ph ], [ %.1, %13 ]
  %.0810 = phi i32 [ %0, %.lr.ph ], [ %16, %13 ]
  %5 = sext i32 %.0810 to i64
  %6 = getelementptr inbounds [1000002 x i32], ptr @vis, i64 0, i64 %5
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = icmp eq i32 %7, %3
  br i1 %8, label %9, label %13

9:                                                ; preds = %4
  %10 = getelementptr inbounds [1000002 x i32], ptr @bit, i64 0, i64 %5
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = add nsw i32 %11, %.011
  br label %13

13:                                               ; preds = %4, %9
  %.1 = phi i32 [ %12, %9 ], [ %.011, %4 ]
  %14 = sub nsw i32 0, %.0810
  %15 = and i32 %.0810, %14
  %16 = add nsw i32 %15, %.0810
  %.not = icmp sgt i32 %16, %2
  br i1 %.not, label %._crit_edge, label %4, !llvm.loop !9

._crit_edge:                                      ; preds = %13, %1
  %.0.lcssa = phi i32 [ 0, %1 ], [ %.1, %13 ]
  ret i32 %.0.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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" }

!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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass