; LLVM IR from kazunetakahashi/atcoder :: 2020/0119_ABC152/past/F.ll (Z5powerx)

; 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 uwtable
define dso_local noundef i64 @_Z5powerx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  %5 = load i64, ptr %3, align 8, !tbaa !5
  %6 = icmp eq i64 %5, 0
  br i1 %6, label %7, label %8

7:                                                ; preds = %1
  store i64 1, ptr %2, align 8
  br label %24

8:                                                ; preds = %1
  %9 = load i64, ptr %3, align 8, !tbaa !5
  %10 = srem i64 %9, 2
  %11 = icmp eq i64 %10, 0
  br i1 %11, label %12, label %19

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %13 = load i64, ptr %3, align 8, !tbaa !5
  %14 = sdiv i64 %13, 2
  %15 = call noundef i64 @_Z5powerx(i64 noundef %14)
  store i64 %15, ptr %4, align 8, !tbaa !5
  %16 = load i64, ptr %4, align 8, !tbaa !5
  %17 = load i64, ptr %4, align 8, !tbaa !5
  %18 = mul nsw i64 %16, %17
  store i64 %18, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %24

19:                                               ; preds = %8
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = sub nsw i64 %20, 1
  %22 = call noundef i64 @_Z5powerx(i64 noundef %21)
  %23 = mul nsw i64 2, %22
  store i64 %23, ptr %2, align 8
  br label %24

24:                                               ; preds = %19, %12, %7
  %25 = load i64, ptr %2, align 8
  ret i64 %25
}

; 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 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"}


; 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 nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z5powerx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i64 %0, 0
  br i1 %2, label %common.ret8, label %3

3:                                                ; preds = %1
  %4 = and i64 %0, 1
  %5 = icmp eq i64 %4, 0
  br i1 %5, label %6, label %10

common.ret8:                                      ; preds = %1, %10, %6
  %common.ret8.op = phi i64 [ %9, %6 ], [ %13, %10 ], [ 1, %1 ]
  ret i64 %common.ret8.op

6:                                                ; preds = %3
  %7 = ashr exact i64 %0, 1
  %8 = tail call noundef i64 @_Z5powerx(i64 noundef %7)
  %9 = mul nsw i64 %8, %8
  br label %common.ret8

10:                                               ; preds = %3
  %11 = add nsw i64 %0, -1
  %12 = tail call noundef i64 @_Z5powerx(i64 noundef %11)
  %13 = shl nsw i64 %12, 1
  br label %common.ret8
}

attributes #0 = { mustprogress nofree 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)"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass