; LLVM IR from DionysiosB/CodeForces :: 0200-0299/226A-FlyingSaucerSegments.ll (Z9findPowerxxx)

; 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 @_Z9findPowerxxx(i64 noundef %0, i64 noundef %1, i64 noundef %2) #0 {
  %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
  store i64 %0, ptr %5, align 8, !tbaa !5
  store i64 %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !5
  %9 = load i64, ptr %6, align 8, !tbaa !5
  %10 = icmp eq i64 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %3
  store i64 1, ptr %4, align 8
  br label %43

12:                                               ; preds = %3
  %13 = load i64, ptr %6, align 8, !tbaa !5
  %14 = icmp eq i64 %13, 1
  br i1 %14, label %15, label %17

15:                                               ; preds = %12
  %16 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %16, ptr %4, align 8
  br label %43

17:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 1, ptr %8, align 8, !tbaa !5
  br label %18

18:                                               ; preds = %32, %17
  %19 = load i64, ptr %6, align 8, !tbaa !5
  %20 = icmp sgt i64 %19, 0
  br i1 %20, label %21, label %41

21:                                               ; preds = %18
  %22 = load i64, ptr %6, align 8, !tbaa !5
  %23 = srem i64 %22, 2
  %24 = icmp ne i64 %23, 0
  br i1 %24, label %25, label %32

25:                                               ; preds = %21
  %26 = load i64, ptr %5, align 8, !tbaa !5
  %27 = load i64, ptr %8, align 8, !tbaa !5
  %28 = mul i64 %27, %26
  store i64 %28, ptr %8, align 8, !tbaa !5
  %29 = load i64, ptr %7, align 8, !tbaa !5
  %30 = load i64, ptr %8, align 8, !tbaa !5
  %31 = urem i64 %30, %29
  store i64 %31, ptr %8, align 8, !tbaa !5
  br label %32

32:                                               ; preds = %25, %21
  %33 = load i64, ptr %5, align 8, !tbaa !5
  %34 = load i64, ptr %5, align 8, !tbaa !5
  %35 = mul nsw i64 %34, %33
  store i64 %35, ptr %5, align 8, !tbaa !5
  %36 = load i64, ptr %7, align 8, !tbaa !5
  %37 = load i64, ptr %5, align 8, !tbaa !5
  %38 = srem i64 %37, %36
  store i64 %38, ptr %5, align 8, !tbaa !5
  %39 = load i64, ptr %6, align 8, !tbaa !5
  %40 = sdiv i64 %39, 2
  store i64 %40, ptr %6, align 8, !tbaa !5
  br label %18, !llvm.loop !9

41:                                               ; preds = %18
  %42 = load i64, ptr %8, align 8, !tbaa !5
  store i64 %42, ptr %4, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %43

43:                                               ; preds = %41, %15, %11
  %44 = load i64, ptr %4, align 8
  ret i64 %44
}

; 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 i64 @_Z9findPowerxxx(i64 noundef %0, i64 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  switch i64 %1, label %.preheader [
    i64 0, label %.loopexit
    i64 1, label %5
  ]

.preheader:                                       ; preds = %3
  %4 = icmp sgt i64 %1, 0
  br i1 %4, label %.lr.ph, label %.loopexit

5:                                                ; preds = %3
  br label %.loopexit

.lr.ph:                                           ; preds = %.preheader, %10
  %.022 = phi i64 [ %.1, %10 ], [ 1, %.preheader ]
  %.01721 = phi i64 [ %13, %10 ], [ %1, %.preheader ]
  %.01820 = phi i64 [ %12, %10 ], [ %0, %.preheader ]
  %6 = and i64 %.01721, 1
  %.not = icmp eq i64 %6, 0
  br i1 %.not, label %10, label %7

7:                                                ; preds = %.lr.ph
  %8 = mul i64 %.022, %.01820
  %9 = urem i64 %8, %2
  br label %10

10:                                               ; preds = %7, %.lr.ph
  %.1 = phi i64 [ %9, %7 ], [ %.022, %.lr.ph ]
  %11 = mul nsw i64 %.01820, %.01820
  %12 = srem i64 %11, %2
  %13 = lshr i64 %.01721, 1
  %.not23 = icmp ult i64 %.01721, 2
  br i1 %.not23, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %10, %.preheader, %3, %5
  %.016 = phi i64 [ %0, %5 ], [ 1, %3 ], [ 1, %.preheader ], [ %.1, %10 ]
  ret i64 %.016
}

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,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass