; LLVM IR from tangjz/acm-icpc :: 51nod/1150.ll (Z4findiii)

; 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"

@a = external dso_local global [50001 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z4findiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %31, %3
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %12, label %32

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = add nsw i32 %13, %14
  %16 = ashr i32 %15, 1
  store i32 %16, ptr %7, align 4, !tbaa !5
  %17 = load i32, ptr %7, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [50001 x i64], ptr @a, i64 0, i64 %18
  %20 = load i64, ptr %19, align 8, !tbaa !9
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = zext i32 %21 to i64
  %23 = shl i64 1, %22
  %24 = and i64 %20, %23
  %25 = icmp ne i64 %24, 0
  br i1 %25, label %26, label %28

26:                                               ; preds = %12
  %27 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %27, ptr %5, align 4, !tbaa !5
  br label %31

28:                                               ; preds = %12
  %29 = load i32, ptr %7, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %4, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %28, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %8, !llvm.loop !11

32:                                               ; preds = %8
  %33 = load i32, ptr %4, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds [50001 x i64], ptr @a, i64 0, i64 %34
  %36 = load i64, ptr %35, align 8, !tbaa !9
  %37 = load i32, ptr %6, align 4, !tbaa !5
  %38 = zext i32 %37 to i64
  %39 = shl i64 1, %38
  %40 = and i64 %36, %39
  %41 = icmp ne i64 %40, 0
  br i1 %41, label %42, label %44

42:                                               ; preds = %32
  %43 = load i32, ptr %4, align 4, !tbaa !5
  br label %47

44:                                               ; preds = %32
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = add nsw i32 %45, 1
  br label %47

47:                                               ; preds = %44, %42
  %48 = phi i32 [ %43, %42 ], [ %46, %44 ]
  ret i32 %48
}

; 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 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@a = external dso_local local_unnamed_addr global [50001 x i64], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z4findiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp slt i32 %0, %1
  %5 = zext nneg i32 %2 to i64
  %6 = shl nuw i64 1, %5
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.016 = phi i32 [ %.1, %.lr.ph ], [ %0, %3 ]
  %.01215 = phi i32 [ %.113, %.lr.ph ], [ %1, %3 ]
  %7 = add nsw i32 %.016, %.01215
  %8 = ashr i32 %7, 1
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [50001 x i64], ptr @a, i64 0, i64 %9
  %11 = load i64, ptr %10, align 8, !tbaa !5
  %12 = and i64 %11, %6
  %.not14 = icmp eq i64 %12, 0
  %13 = add nsw i32 %8, 1
  %.113 = select i1 %.not14, i32 %.01215, i32 %8
  %.1 = select i1 %.not14, i32 %13, i32 %.016
  %14 = icmp slt i32 %.1, %.113
  br i1 %14, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.0.lcssa = phi i32 [ %0, %3 ], [ %.1, %.lr.ph ]
  %15 = sext i32 %.0.lcssa to i64
  %16 = getelementptr inbounds [50001 x i64], ptr @a, i64 0, i64 %15
  %17 = load i64, ptr %16, align 8, !tbaa !5
  %18 = and i64 %17, %6
  %.not = icmp eq i64 %18, 0
  %19 = zext i1 %.not to i32
  %20 = add nsw i32 %.0.lcssa, %19
  ret i32 %20
}

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


; Effective O3 passes: BDCEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass