; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ (1056（数学题）)

; 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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [12 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca float, align 4
  %3 = alloca float, align 4
  %4 = alloca float, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store float 0.000000e+00, ptr %2, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %34, %0
  br label %8

8:                                                ; preds = %7
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store float 0.000000e+00, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store float 0.000000e+00, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  %10 = load float, ptr %2, align 4, !tbaa !5
  %11 = fpext float %10 to double
  %12 = fcmp oeq double %11, 0.000000e+00
  br i1 %12, label %13, label %14

13:                                               ; preds = %8
  store i32 3, ptr %6, align 4
  br label %32

14:                                               ; preds = %8
  store float 2.000000e+00, ptr %4, align 4, !tbaa !5
  br label %15

15:                                               ; preds = %26, %14
  %16 = load float, ptr %3, align 4, !tbaa !5
  %17 = load float, ptr %2, align 4, !tbaa !5
  %18 = fcmp olt float %16, %17
  br i1 %18, label %19, label %29

19:                                               ; preds = %15
  %20 = load float, ptr %3, align 4, !tbaa !5
  %21 = load float, ptr %4, align 4, !tbaa !5
  %22 = fdiv float 1.000000e+00, %21
  %23 = fadd float %20, %22
  store float %23, ptr %3, align 4, !tbaa !5
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %5, align 4, !tbaa !9
  br label %26

26:                                               ; preds = %19
  %27 = load float, ptr %4, align 4, !tbaa !5
  %28 = fadd float %27, 1.000000e+00
  store float %28, ptr %4, align 4, !tbaa !5
  br label %15, !llvm.loop !11

29:                                               ; preds = %15
  %30 = load i32, ptr %5, align 4, !tbaa !9
  %31 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %30)
  store i32 0, ptr %6, align 4
  br label %32

32:                                               ; preds = %29, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  %33 = load i32, ptr %6, align 4
  switch i32 %33, label %37 [
    i32 0, label %34
    i32 3, label %35
  ]

34:                                               ; preds = %32
  br label %7, !llvm.loop !13

35:                                               ; preds = %32
  store i32 0, ptr %1, align 4
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %36 = load i32, ptr %1, align 4
  ret i32 %36

37:                                               ; preds = %32
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress norecurse 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 = { "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 #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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [12 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca float, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  store float 0.000000e+00, ptr %1, align 4, !tbaa !5
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %3 = load float, ptr %1, align 4, !tbaa !5
  %4 = fcmp oeq float %3, 0.000000e+00
  br i1 %4, label %._crit_edge15, label %.preheader

.preheader:                                       ; preds = %0, %._crit_edge
  %5 = phi float [ %14, %._crit_edge ], [ %3, %0 ]
  %6 = fcmp ogt float %5, 0.000000e+00
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.0714 = phi i32 [ %9, %.lr.ph ], [ 0, %.preheader ]
  %.0813 = phi float [ %10, %.lr.ph ], [ 2.000000e+00, %.preheader ]
  %.0912 = phi float [ %8, %.lr.ph ], [ 0.000000e+00, %.preheader ]
  %7 = fdiv float 1.000000e+00, %.0813
  %8 = fadd float %.0912, %7
  %9 = add nuw nsw i32 %.0714, 1
  %10 = fadd float %.0813, 1.000000e+00
  %11 = fcmp olt float %8, %5
  br i1 %11, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.07.lcssa = phi i32 [ 0, %.preheader ], [ %9, %.lr.ph ]
  %12 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.07.lcssa)
  %13 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %14 = load float, ptr %1, align 4, !tbaa !5
  %15 = fcmp oeq float %14, 0.000000e+00
  br i1 %15, label %._crit_edge15, label %.preheader

._crit_edge15:                                    ; preds = %._crit_edge, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress nofree norecurse 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "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 #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 = !{!"float", !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,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass