; LLVM IR from tangjz/acm-icpc :: 51nod/1602.ll (Z8calc_mu2x)

; 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 [8000001 x i32], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z8calc_mu2x(i64 noundef %0) #1 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %7 = load i64, ptr %2, align 8, !tbaa !5
  %8 = call noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef %7)
  %9 = fptosi double %8 to i32
  store i32 %9, ptr %6, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %48, %1
  %11 = load i32, ptr %4, align 4, !tbaa !9
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = icmp sle i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %51

15:                                               ; preds = %10
  %16 = load i64, ptr %2, align 8, !tbaa !5
  %17 = load i64, ptr %2, align 8, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = sdiv i64 %17, %19
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = sdiv i64 %20, %22
  %24 = sdiv i64 %16, %23
  %25 = call noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef %24)
  %26 = fptosi double %25 to i32
  store i32 %26, ptr %5, align 4, !tbaa !9
  %27 = load i64, ptr %2, align 8, !tbaa !5
  %28 = load i32, ptr %4, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = sdiv i64 %27, %29
  %31 = load i32, ptr %4, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = sdiv i64 %30, %32
  %34 = load i32, ptr %5, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [8000001 x i32], ptr @mu, i64 0, i64 %35
  %37 = load i32, ptr %36, align 4, !tbaa !9
  %38 = load i32, ptr %4, align 4, !tbaa !9
  %39 = sub nsw i32 %38, 1
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [8000001 x i32], ptr @mu, i64 0, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !9
  %43 = sub nsw i32 %37, %42
  %44 = sext i32 %43 to i64
  %45 = mul nsw i64 %33, %44
  %46 = load i64, ptr %3, align 8, !tbaa !5
  %47 = add nsw i64 %46, %45
  store i64 %47, ptr %3, align 8, !tbaa !5
  br label %48

48:                                               ; preds = %15
  %49 = load i32, ptr %5, align 4, !tbaa !9
  %50 = add nsw i32 %49, 1
  store i32 %50, ptr %4, align 4, !tbaa !9
  br label %10, !llvm.loop !11

51:                                               ; preds = %14
  %52 = load i64, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret i64 %52
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 #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 = !{!"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 [8000001 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z8calc_mu2x(i64 noundef %0) local_unnamed_addr #0 {
  %2 = tail call noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef %0)
  %3 = fptosi double %2 to i32
  %.not16 = icmp slt i32 %3, 1
  br i1 %.not16, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.0.lcssa = phi i64 [ 0, %1 ], [ %20, %.lr.ph ]
  ret i64 %.0.lcssa

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.018 = phi i64 [ %20, %.lr.ph ], [ 0, %1 ]
  %.01517 = phi i32 [ %21, %.lr.ph ], [ 1, %1 ]
  %4 = sext i32 %.01517 to i64
  %5 = sdiv i64 %0, %4
  %6 = sdiv i64 %5, %4
  %7 = sdiv i64 %0, %6
  %8 = tail call noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef %7)
  %9 = fptosi double %8 to i32
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [8000001 x i32], ptr @mu, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = add nsw i32 %.01517, -1
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [8000001 x i32], ptr @mu, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = sub nsw i32 %12, %16
  %18 = sext i32 %17 to i64
  %19 = mul nsw i64 %6, %18
  %20 = add nsw i64 %19, %.018
  %21 = add nsw i32 %9, 1
  %.not.not = icmp slt i32 %9, %3
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 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: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass