; LLVM IR from Izaron/ACM-ICPC :: Russian Olympiad in Informatics/Final Stage 2015/grants.ll (Z4coolx)

; 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: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z4coolx(i64 noundef %0) #2 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store i64 0, ptr %4, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %30, %1
  %9 = load i64, ptr %4, align 8, !tbaa !5
  %10 = load i64, ptr %2, align 8, !tbaa !5
  %11 = icmp sle i64 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  store i32 2, ptr %5, align 4
  br label %33

13:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %14 = load i64, ptr %2, align 8, !tbaa !5
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = mul nsw i64 2, %15
  %17 = sub nsw i64 %14, %16
  store i64 %17, ptr %6, align 8, !tbaa !5
  %18 = load i64, ptr %6, align 8, !tbaa !5
  %19 = icmp slt i64 %18, 0
  br i1 %19, label %20, label %21

20:                                               ; preds = %13
  store i32 2, ptr %5, align 4
  br label %27

21:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %22 = load i64, ptr %4, align 8, !tbaa !5
  %23 = load i64, ptr %6, align 8, !tbaa !5
  %24 = and i64 %22, %23
  store i64 %24, ptr %7, align 8, !tbaa !5
  %25 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %7)
  %26 = load i64, ptr %25, align 8, !tbaa !5
  store i64 %26, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  store i32 0, ptr %5, align 4
  br label %27

27:                                               ; preds = %21, %20
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %28 = load i32, ptr %5, align 4
  switch i32 %28, label %33 [
    i32 0, label %29
  ]

29:                                               ; preds = %27
  br label %30

30:                                               ; preds = %29
  %31 = load i64, ptr %4, align 8, !tbaa !5
  %32 = add nsw i64 %31, 1
  store i64 %32, ptr %4, align 8, !tbaa !5
  br label %8, !llvm.loop !9

33:                                               ; preds = %27, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %34

34:                                               ; preds = %33
  %35 = load i64, ptr %3, align 8, !tbaa !5
  store i32 1, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret i64 %35
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 = { 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 #3 = { 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1

; Function Attrs: mustprogress 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 @_Z4coolx(i64 noundef %0) local_unnamed_addr #2 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  store i64 0, ptr %2, align 8, !tbaa !5
  %.not12 = icmp slt i64 %0, 0
  br i1 %.not12, label %.critedge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %4 = add nuw i64 %0, 2
  %5 = lshr i64 %4, 1
  br label %6

6:                                                ; preds = %6, %.lr.ph.preheader
  %.01317 = phi i64 [ 0, %.lr.ph.preheader ], [ %12, %6 ]
  %7 = shl nuw nsw i64 %.01317, 1
  %8 = sub nsw i64 %0, %7
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %9 = and i64 %8, %.01317
  store i64 %9, ptr %3, align 8, !tbaa !5
  %10 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %11 = load i64, ptr %10, align 8, !tbaa !5
  store i64 %11, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  %exitcond15.not = icmp eq i64 %.01317, %0
  %12 = add nuw nsw i64 %.01317, 1
  %exitcond.not = icmp eq i64 %12, %5
  %or.cond = select i1 %exitcond15.not, i1 true, i1 %exitcond.not
  br i1 %or.cond, label %.critedge, label %6, !llvm.loop !9

.critedge:                                        ; preds = %6, %1
  %13 = phi i64 [ 0, %1 ], [ %11, %6 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  ret i64 %13
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 = { 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 #3 = { 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"}


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