; LLVM IR from tangjz/acm-icpc :: 51nod/1222.ll (Z4calcx)

; 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"

@mu = external dso_local global [316228 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z6calc_3x(i64 noundef) #0

; 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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z4calcx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %5 = load i64, ptr %2, align 8, !tbaa !5
  store i64 %5, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 1, ptr %4, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %33, %1
  %7 = load i64, ptr %4, align 8, !tbaa !5
  %8 = load i64, ptr %4, align 8, !tbaa !5
  %9 = mul nsw i64 %7, %8
  %10 = load i64, ptr %2, align 8, !tbaa !5
  %11 = icmp sle i64 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %36

13:                                               ; preds = %6
  %14 = load i64, ptr %4, align 8, !tbaa !5
  %15 = getelementptr inbounds [316228 x i32], ptr @mu, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !9
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %32

18:                                               ; preds = %13
  %19 = load i64, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds [316228 x i32], ptr @mu, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = load i64, ptr %2, align 8, !tbaa !5
  %24 = load i64, ptr %4, align 8, !tbaa !5
  %25 = sdiv i64 %23, %24
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = sdiv i64 %25, %26
  %28 = call noundef i64 @_Z6calc_3x(i64 noundef %27)
  %29 = mul nsw i64 %22, %28
  %30 = load i64, ptr %3, align 8, !tbaa !5
  %31 = add nsw i64 %30, %29
  store i64 %31, ptr %3, align 8, !tbaa !5
  br label %32

32:                                               ; preds = %18, %13
  br label %33

33:                                               ; preds = %32
  %34 = load i64, ptr %4, align 8, !tbaa !5
  %35 = add nsw i64 %34, 1
  store i64 %35, ptr %4, align 8, !tbaa !5
  br label %6, !llvm.loop !11

36:                                               ; preds = %12
  %37 = load i64, ptr %3, align 8, !tbaa !5
  %38 = ashr i64 %37, 1
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %38
}

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 = !{!"long long", !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"}


; 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"

@mu = external dso_local local_unnamed_addr global [316228 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z6calc_3x(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef range(i64 -4611686018427387904, 4611686018427387904) i64 @_Z4calcx(i64 noundef %0) local_unnamed_addr #0 {
  %.not16 = icmp slt i64 %0, 1
  br i1 %.not16, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %12, %1
  %.012.lcssa = phi i64 [ %0, %1 ], [ %.1, %12 ]
  %2 = ashr i64 %.012.lcssa, 1
  ret i64 %2

.lr.ph:                                           ; preds = %1, %12
  %.018 = phi i64 [ %13, %12 ], [ 1, %1 ]
  %.01217 = phi i64 [ %.1, %12 ], [ %0, %1 ]
  %3 = getelementptr inbounds [316228 x i32], ptr @mu, i64 0, i64 %.018
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %.not15 = icmp eq i32 %4, 0
  br i1 %.not15, label %12, label %5

5:                                                ; preds = %.lr.ph
  %6 = sext i32 %4 to i64
  %7 = udiv i64 %0, %.018
  %8 = udiv i64 %7, %.018
  %9 = tail call noundef i64 @_Z6calc_3x(i64 noundef %8)
  %10 = mul nsw i64 %9, %6
  %11 = add nsw i64 %10, %.01217
  br label %12

12:                                               ; preds = %.lr.ph, %5
  %.1 = phi i64 [ %11, %5 ], [ %.01217, %.lr.ph ]
  %13 = add nuw nsw i64 %.018, 1
  %14 = mul nuw nsw i64 %13, %13
  %.not = icmp sgt i64 %14, %0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

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" }

!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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass