; LLVM IR from tangjz/acm-icpc :: hdu/5683.ll (Z6updateiiii)

; 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"

@seq = external dso_local global [40002 x i32], align 16
@seg = external dso_local global [80004 x i32], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6updateiiii(i32 noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !5
  store i32 %3, ptr %8, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %38, %4
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = load i32, ptr %6, align 4, !tbaa !5
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %14, label %39

14:                                               ; preds = %10
  %15 = load i32, ptr %8, align 4, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = load i32, ptr %6, align 4, !tbaa !5
  %18 = call noundef i32 @_Z7seg_idxii(i32 noundef %16, i32 noundef %17)
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [80004 x i32], ptr @seg, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = add nsw i32 %21, %15
  store i32 %22, ptr %20, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = load i32, ptr %6, align 4, !tbaa !5
  %25 = add nsw i32 %23, %24
  %26 = ashr i32 %25, 1
  store i32 %26, ptr %9, align 4, !tbaa !5
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = load i32, ptr %9, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [40002 x i32], ptr @seq, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = icmp sle i32 %27, %31
  br i1 %32, label %33, label %35

33:                                               ; preds = %14
  %34 = load i32, ptr %9, align 4, !tbaa !5
  store i32 %34, ptr %6, align 4, !tbaa !5
  br label %38

35:                                               ; preds = %14
  %36 = load i32, ptr %9, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %5, align 4, !tbaa !5
  br label %38

38:                                               ; preds = %35, %33
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %10, !llvm.loop !9

39:                                               ; preds = %10
  %40 = load i32, ptr %8, align 4, !tbaa !5
  %41 = load i32, ptr %5, align 4, !tbaa !5
  %42 = load i32, ptr %6, align 4, !tbaa !5
  %43 = call noundef i32 @_Z7seg_idxii(i32 noundef %41, i32 noundef %42)
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [80004 x i32], ptr @seg, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = add nsw i32 %46, %40
  store i32 %47, ptr %45, align 4, !tbaa !5
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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" }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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"

@seq = external dso_local local_unnamed_addr global [40002 x i32], align 16
@seg = external dso_local local_unnamed_addr global [80004 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z6updateiiii(i32 noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = icmp slt i32 %0, %1
  br i1 %5, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %4, %.lr.ph
  %.017 = phi i32 [ %.1, %.lr.ph ], [ %0, %4 ]
  %.01416 = phi i32 [ %.115, %.lr.ph ], [ %1, %4 ]
  %6 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %.017, i32 noundef %.01416)
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [80004 x i32], ptr @seg, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = add nsw i32 %9, %3
  store i32 %10, ptr %8, align 4, !tbaa !5
  %11 = add nsw i32 %.017, %.01416
  %12 = ashr i32 %11, 1
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [40002 x i32], ptr @seq, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %.not = icmp slt i32 %15, %2
  %16 = add nsw i32 %12, 1
  %.115 = select i1 %.not, i32 %.01416, i32 %12
  %.1 = select i1 %.not, i32 %16, i32 %.017
  %17 = icmp slt i32 %.1, %.115
  br i1 %17, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %4
  %.014.lcssa = phi i32 [ %1, %4 ], [ %.115, %.lr.ph ]
  %.0.lcssa = phi i32 [ %0, %4 ], [ %.1, %.lr.ph ]
  %18 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %.0.lcssa, i32 noundef %.014.lcssa)
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [80004 x i32], ptr @seg, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = add nsw i32 %21, %3
  store i32 %22, ptr %20, align 4, !tbaa !5
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) 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: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass