; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/AIM Tech Round 3/Problem A/A.ll (Z3getx)

; 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 @_Z3getx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %7 = load i64, ptr %2, align 8, !tbaa !5
  %8 = add nsw i64 %7, 10
  store i64 %8, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  br label %9

9:                                                ; preds = %31, %1
  %10 = load i64, ptr %3, align 8, !tbaa !5
  %11 = add nsw i64 %10, 1
  %12 = load i64, ptr %4, align 8, !tbaa !5
  %13 = icmp slt i64 %11, %12
  br i1 %13, label %14, label %32

14:                                               ; preds = %9
  %15 = load i64, ptr %3, align 8, !tbaa !5
  %16 = load i64, ptr %4, align 8, !tbaa !5
  %17 = add nsw i64 %15, %16
  %18 = sdiv i64 %17, 2
  store i64 %18, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = load i64, ptr %5, align 8, !tbaa !5
  %21 = sub nsw i64 %20, 1
  %22 = mul nsw i64 %19, %21
  %23 = sdiv i64 %22, 2
  store i64 %23, ptr %6, align 8, !tbaa !5
  %24 = load i64, ptr %6, align 8, !tbaa !5
  %25 = load i64, ptr %2, align 8, !tbaa !5
  %26 = icmp sle i64 %24, %25
  br i1 %26, label %27, label %29

27:                                               ; preds = %14
  %28 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %28, ptr %3, align 8, !tbaa !5
  br label %31

29:                                               ; preds = %14
  %30 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %30, ptr %4, align 8, !tbaa !5
  br label %31

31:                                               ; preds = %29, %27
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %9, !llvm.loop !9

32:                                               ; preds = %9
  %33 = load i64, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %33
}

; 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 range(i64 0, 4611686018427387904) i64 @_Z3getx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp sgt i64 %0, -9
  br i1 %2, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %3 = add nsw i64 %0, 10
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.015 = phi i64 [ %.0., %.lr.ph ], [ 0, %.lr.ph.preheader ]
  %.01214 = phi i64 [ %..012, %.lr.ph ], [ %3, %.lr.ph.preheader ]
  %4 = add nuw nsw i64 %.015, %.01214
  %5 = lshr i64 %4, 1
  %6 = add nsw i64 %5, -1
  %7 = mul nsw i64 %6, %5
  %8 = lshr i64 %7, 1
  %.not = icmp sgt i64 %8, %0
  %..012 = select i1 %.not, i64 %5, i64 %.01214
  %.0. = select i1 %.not, i64 %.015, i64 %5
  %9 = add nuw nsw i64 %.0., 1
  %10 = icmp slt i64 %9, %..012
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.0.lcssa = phi i64 [ 0, %1 ], [ %.0., %.lr.ph ]
  ret i64 %.0.lcssa
}

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,ReassociatePass,SROAPass,SimplifyCFGPass