; LLVM IR from kazunetakahashi/atcoder :: 2018/0114_AGC020/D.ll (Z6calc_Kxx)

; 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: 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 nounwind uwtable
define dso_local noundef i64 @_Z6calc_Kxx(i64 noundef %0, i64 noundef %1) #1 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 500000010, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %35, %2
  %9 = load i64, ptr %5, align 8, !tbaa !5
  %10 = load i64, ptr %6, align 8, !tbaa !5
  %11 = sub nsw i64 %9, %10
  %12 = icmp sgt i64 %11, 1
  br i1 %12, label %13, label %36

13:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %14 = load i64, ptr %5, align 8, !tbaa !5
  %15 = load i64, ptr %6, align 8, !tbaa !5
  %16 = add nsw i64 %14, %15
  %17 = sdiv i64 %16, 2
  store i64 %17, ptr %7, align 8, !tbaa !5
  %18 = load i64, ptr %3, align 8, !tbaa !5
  %19 = load i64, ptr %4, align 8, !tbaa !5
  %20 = add nsw i64 %19, 1
  %21 = load i64, ptr %7, align 8, !tbaa !5
  %22 = mul nsw i64 %20, %21
  %23 = icmp sle i64 %18, %22
  br i1 %23, label %24, label %33

24:                                               ; preds = %13
  %25 = load i64, ptr %4, align 8, !tbaa !5
  %26 = load i64, ptr %3, align 8, !tbaa !5
  %27 = add nsw i64 %26, 1
  %28 = load i64, ptr %7, align 8, !tbaa !5
  %29 = mul nsw i64 %27, %28
  %30 = icmp sle i64 %25, %29
  br i1 %30, label %31, label %33

31:                                               ; preds = %24
  %32 = load i64, ptr %7, align 8, !tbaa !5
  store i64 %32, ptr %5, align 8, !tbaa !5
  br label %35

33:                                               ; preds = %24, %13
  %34 = load i64, ptr %7, align 8, !tbaa !5
  store i64 %34, ptr %6, align 8, !tbaa !5
  br label %35

35:                                               ; preds = %33, %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  br label %8, !llvm.loop !9

36:                                               ; preds = %8
  %37 = load i64, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %37
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 i64 @_Z6calc_Kxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = add nsw i64 %1, 1
  %4 = add nsw i64 %0, 1
  br label %5

5:                                                ; preds = %2, %5
  %.018 = phi i64 [ 500000010, %2 ], [ %.1, %5 ]
  %.01317 = phi i64 [ 0, %2 ], [ %.114, %5 ]
  %6 = add nsw i64 %.018, %.01317
  %7 = sdiv i64 %6, 2
  %8 = mul nsw i64 %7, %3
  %.not = icmp slt i64 %8, %0
  %9 = mul nsw i64 %7, %4
  %.not16 = icmp slt i64 %9, %1
  %or.cond = select i1 %.not, i1 true, i1 %.not16
  %.114 = select i1 %or.cond, i64 %7, i64 %.01317
  %.1 = select i1 %or.cond, i64 %.018, i64 %7
  %10 = sub nsw i64 %.1, %.114
  %11 = icmp sgt i64 %10, 1
  br i1 %11, label %5, label %12, !llvm.loop !5

12:                                               ; preds = %5
  ret i64 %.1
}

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,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass