; LLVM IR from kazunetakahashi/atcoder :: 2018/1222_CADDi2018/E.ll (Z4calcxx)

; 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 @_Z4calcxx(i64 noundef %0, i64 noundef %1) #0 {
  %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
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  %10 = load i64, ptr %4, align 8, !tbaa !5
  %11 = load i64, ptr %5, align 8, !tbaa !5
  %12 = icmp sgt i64 %10, %11
  br i1 %12, label %13, label %27

13:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store i64 1, ptr %7, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %20, %13
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = load i64, ptr %7, align 8, !tbaa !5
  %18 = mul nsw i64 %16, %17
  %19 = icmp sgt i64 %15, %18
  br i1 %19, label %20, label %25

20:                                               ; preds = %14
  %21 = load i64, ptr %6, align 8, !tbaa !5
  %22 = add nsw i64 %21, 2
  store i64 %22, ptr %6, align 8, !tbaa !5
  %23 = load i64, ptr %7, align 8, !tbaa !5
  %24 = mul nsw i64 %23, 4
  store i64 %24, ptr %7, align 8, !tbaa !5
  br label %14, !llvm.loop !9

25:                                               ; preds = %14
  %26 = load i64, ptr %6, align 8, !tbaa !5
  store i64 %26, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %42

27:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 0, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  store i64 1, ptr %9, align 8, !tbaa !5
  br label %28

28:                                               ; preds = %35, %27
  %29 = load i64, ptr %4, align 8, !tbaa !5
  %30 = load i64, ptr %9, align 8, !tbaa !5
  %31 = mul nsw i64 %30, 4
  %32 = mul nsw i64 %29, %31
  %33 = load i64, ptr %5, align 8, !tbaa !5
  %34 = icmp sle i64 %32, %33
  br i1 %34, label %35, label %40

35:                                               ; preds = %28
  %36 = load i64, ptr %8, align 8, !tbaa !5
  %37 = sub nsw i64 %36, 2
  store i64 %37, ptr %8, align 8, !tbaa !5
  %38 = load i64, ptr %9, align 8, !tbaa !5
  %39 = mul nsw i64 %38, 4
  store i64 %39, ptr %9, align 8, !tbaa !5
  br label %28, !llvm.loop !11

40:                                               ; preds = %28
  %41 = load i64, ptr %8, align 8, !tbaa !5
  store i64 %41, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %42

42:                                               ; preds = %40, %25
  %43 = load i64, ptr %3, align 8
  ret i64 %43
}

; 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"}
!11 = distinct !{!11, !10}


; 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 @_Z4calcxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i64 %0, %1
  br i1 %3, label %.preheader, label %.preheader22

.preheader:                                       ; preds = %2, %.preheader
  %.01625 = phi i64 [ %5, %.preheader ], [ 1, %2 ]
  %.01724 = phi i64 [ %4, %.preheader ], [ 0, %2 ]
  %4 = add nuw nsw i64 %.01724, 2
  %5 = shl nsw i64 %.01625, 2
  %6 = mul nsw i64 %5, %1
  %7 = icmp slt i64 %6, %0
  br i1 %7, label %.preheader, label %.loopexit, !llvm.loop !5

.preheader22:                                     ; preds = %2, %.preheader22
  %.015 = phi i64 [ %10, %.preheader22 ], [ 0, %2 ]
  %.0 = phi i64 [ %8, %.preheader22 ], [ 1, %2 ]
  %8 = shl nsw i64 %.0, 2
  %9 = mul nsw i64 %8, %0
  %.not = icmp sgt i64 %9, %1
  %10 = add nsw i64 %.015, -2
  br i1 %.not, label %.loopexit, label %.preheader22, !llvm.loop !7

.loopexit:                                        ; preds = %.preheader22, %.preheader
  %.018 = phi i64 [ %4, %.preheader ], [ %.015, %.preheader22 ]
  ret i64 %.018
}

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"}
!7 = distinct !{!7, !6}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass