; LLVM IR from Mohammed-Shoaib/Coding-Problems :: Codeforces/Solutions/1296B.ll (Z11food_buyingi)

; 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 i32 @_Z11food_buyingi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %10, %1
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = mul nsw i32 %6, 10
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = icmp sle i32 %7, %8
  br i1 %9, label %10, label %13

10:                                               ; preds = %5
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = mul nsw i32 %11, 10
  store i32 %12, ptr %4, align 4, !tbaa !5
  br label %5, !llvm.loop !9

13:                                               ; preds = %5
  br label %14

14:                                               ; preds = %34, %13
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = icmp ne i32 %15, 0
  br i1 %16, label %17, label %35

17:                                               ; preds = %14
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = add nsw i32 %19, %18
  store i32 %20, ptr %3, align 4, !tbaa !5
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = sdiv i32 %22, 10
  %24 = sub nsw i32 %21, %23
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = sub nsw i32 %25, %24
  store i32 %26, ptr %2, align 4, !tbaa !5
  br label %27

27:                                               ; preds = %31, %17
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = icmp sgt i32 %28, %29
  br i1 %30, label %31, label %34

31:                                               ; preds = %27
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = sdiv i32 %32, 10
  store i32 %33, ptr %4, align 4, !tbaa !5
  br label %27, !llvm.loop !11

34:                                               ; preds = %27
  br label %14, !llvm.loop !12

35:                                               ; preds = %14
  %36 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %36
}

; 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !10}


; 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 i32 @_Z11food_buyingi(i32 noundef %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %2, %1
  %.0 = phi i32 [ 1, %1 ], [ %3, %2 ]
  %3 = mul nuw nsw i32 %.0, 10
  %.not = icmp sgt i32 %3, %0
  br i1 %.not, label %.preheader, label %2, !llvm.loop !5

.preheader:                                       ; preds = %2
  %.not1821 = icmp eq i32 %0, 0
  br i1 %.not1821, label %._crit_edge, label %.lr.ph25

.loopexit:                                        ; preds = %.lr.ph, %.lr.ph25
  %.2.lcssa = phi i32 [ %.124, %.lr.ph25 ], [ %7, %.lr.ph ]
  %.not18 = icmp eq i32 %5, 0
  br i1 %.not18, label %._crit_edge, label %.lr.ph25, !llvm.loop !7

.lr.ph25:                                         ; preds = %.preheader, %.loopexit
  %.124 = phi i32 [ %.2.lcssa, %.loopexit ], [ %.0, %.preheader ]
  %.01323 = phi i32 [ %4, %.loopexit ], [ 0, %.preheader ]
  %.01422 = phi i32 [ %5, %.loopexit ], [ %0, %.preheader ]
  %4 = add nsw i32 %.124, %.01323
  %.neg.neg27 = sdiv i32 %.124, 10
  %.neg19 = sub i32 %.01422, %.124
  %5 = add i32 %.neg19, %.neg.neg27
  %6 = icmp sgt i32 %.124, %5
  br i1 %6, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph25, %.lr.ph
  %.220 = phi i32 [ %7, %.lr.ph ], [ %.124, %.lr.ph25 ]
  %7 = sdiv i32 %.220, 10
  %8 = icmp sgt i32 %7, %5
  br i1 %8, label %.lr.ph, label %.loopexit, !llvm.loop !8

._crit_edge:                                      ; preds = %.loopexit, %.preheader
  %.013.lcssa = phi i32 [ 0, %.preheader ], [ %4, %.loopexit ]
  ret i32 %.013.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"}
!7 = distinct !{!7, !6}
!8 = distinct !{!8, !6}


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