; LLVM IR from Shah-Shishir/Codeforces-Solutions :: 932B. Recursive Queries.ll (Z5retIti)

; 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 i32 @_Z5retIti(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = icmp slt i32 %5, 10
  br i1 %6, label %7, label %9

7:                                                ; preds = %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %8, ptr %2, align 4
  br label %28

9:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %22, %9
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %13, label %25

13:                                               ; preds = %10
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = srem i32 %14, 10
  %16 = icmp ne i32 %15, 0
  br i1 %16, label %17, label %22

17:                                               ; preds = %13
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = srem i32 %18, 10
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = mul nsw i32 %20, %19
  store i32 %21, ptr %4, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %17, %13
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = sdiv i32 %23, 10
  store i32 %24, ptr %3, align 4, !tbaa !5
  br label %10, !llvm.loop !9

25:                                               ; preds = %10
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = call noundef i32 @_Z5retIti(i32 noundef %26)
  store i32 %27, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %28

28:                                               ; preds = %25, %7
  %29 = load i32, ptr %2, align 4
  ret i32 %29
}

; 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 = !{!"int", !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(i32 -2147483648, 10) i32 @_Z5retIti(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 10
  br i1 %2, label %tailrecurse._crit_edge, label %.preheader

tailrecurse.loopexit:                             ; preds = %.preheader
  %3 = icmp ult i32 %spec.select, 10
  br i1 %3, label %tailrecurse._crit_edge, label %.preheader.backedge

.preheader:                                       ; preds = %1, %.preheader.backedge
  %.016 = phi i32 [ %.016.be, %.preheader.backedge ], [ 1, %1 ]
  %.0915 = phi i32 [ %.0915.be, %.preheader.backedge ], [ %0, %1 ]
  %4 = urem i32 %.0915, 10
  %5 = tail call i32 @llvm.umax.i32(i32 %4, i32 1)
  %spec.select = mul nuw nsw i32 %5, %.016
  %6 = udiv i32 %.0915, 10
  %.not = icmp ult i32 %.0915, 10
  br i1 %.not, label %tailrecurse.loopexit, label %.preheader.backedge

.preheader.backedge:                              ; preds = %.preheader, %tailrecurse.loopexit
  %.016.be = phi i32 [ %spec.select, %.preheader ], [ 1, %tailrecurse.loopexit ]
  %.0915.be = phi i32 [ %6, %.preheader ], [ %spec.select, %tailrecurse.loopexit ]
  br label %.preheader, !llvm.loop !5

tailrecurse._crit_edge:                           ; preds = %tailrecurse.loopexit, %1
  %.tr.lcssa = phi i32 [ %0, %1 ], [ %spec.select, %tailrecurse.loopexit ]
  ret i32 %.tr.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.umax.i32(i32, i32) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass