; LLVM IR from kazunetakahashi/atcoder :: 2018/1124_dowcon5th-prelims/D.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"

; 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
  %5 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 100010, ptr %4, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %25, %1
  %7 = load i64, ptr %4, align 8, !tbaa !5
  %8 = load i64, ptr %3, align 8, !tbaa !5
  %9 = sub nsw i64 %7, %8
  %10 = icmp sgt i64 %9, 1
  br i1 %10, label %11, label %26

11:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %12 = load i64, ptr %4, align 8, !tbaa !5
  %13 = load i64, ptr %3, align 8, !tbaa !5
  %14 = add nsw i64 %12, %13
  %15 = sdiv i64 %14, 2
  store i64 %15, ptr %5, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = load i64, ptr %5, align 8, !tbaa !5
  %18 = mul nsw i64 %16, %17
  %19 = load i64, ptr %2, align 8, !tbaa !5
  %20 = icmp slt i64 %18, %19
  br i1 %20, label %21, label %23

21:                                               ; preds = %11
  %22 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %22, ptr %3, align 8, !tbaa !5
  br label %25

23:                                               ; preds = %11
  %24 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %24, ptr %4, align 8, !tbaa !5
  br label %25

25:                                               ; preds = %23, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %6, !llvm.loop !9

26:                                               ; preds = %6
  %27 = load i64, ptr %4, align 8, !tbaa !5
  %28 = sub nsw i64 %27, 1
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %28
}

; 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 = !{!"long long", !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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef range(i64 -9223372036854775808, 9223372036854775807) i64 @_Z4calcx(i64 noundef %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %1, %2
  %.013 = phi i64 [ 0, %1 ], [ %..0, %2 ]
  %.01012 = phi i64 [ 100010, %1 ], [ %.010., %2 ]
  %3 = add nsw i64 %.013, %.01012
  %4 = sdiv i64 %3, 2
  %5 = mul nsw i64 %4, %4
  %6 = icmp slt i64 %5, %0
  %.010. = select i1 %6, i64 %.01012, i64 %4
  %..0 = select i1 %6, i64 %4, i64 %.013
  %7 = sub nsw i64 %.010., %..0
  %8 = icmp sgt i64 %7, 1
  br i1 %8, label %2, label %9, !llvm.loop !5

9:                                                ; preds = %2
  %10 = add nsw i64 %.010., -1
  ret i64 %10
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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