; LLVM IR from brpapa/algorithms :: solutions/uri (2880)

; 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 @_Z17contaPosPossiveisNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i8, align 1
  %9 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %56, %2
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #3
  %14 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  %15 = sub i64 %13, %14
  %16 = icmp ule i64 %12, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %10
  store i32 2, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %59

18:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 1, ptr %8) #3
  store i8 1, ptr %8, align 1, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %46, %18
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  %23 = icmp ult i64 %21, %22
  br i1 %23, label %24, label %27

24:                                               ; preds = %19
  %25 = load i8, ptr %8, align 1, !tbaa !11, !range !13, !noundef !14
  %26 = trunc i8 %25 to i1
  br label %27

27:                                               ; preds = %24, %19
  %28 = phi i1 [ false, %19 ], [ %26, %24 ]
  br i1 %28, label %30, label %29

29:                                               ; preds = %27
  store i32 5, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %49

30:                                               ; preds = %27
  %31 = load i32, ptr %9, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %32)
  %34 = load i8, ptr %33, align 1, !tbaa !15
  %35 = sext i8 %34 to i32
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = load i32, ptr %6, align 4, !tbaa !9
  %38 = add nsw i32 %36, %37
  %39 = sext i32 %38 to i64
  %40 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %39)
  %41 = load i8, ptr %40, align 1, !tbaa !15
  %42 = sext i8 %41 to i32
  %43 = icmp eq i32 %35, %42
  br i1 %43, label %44, label %45

44:                                               ; preds = %30
  store i8 0, ptr %8, align 1, !tbaa !11
  br label %45

45:                                               ; preds = %44, %30
  br label %46

46:                                               ; preds = %45
  %47 = load i32, ptr %9, align 4, !tbaa !9
  %48 = add nsw i32 %47, 1
  store i32 %48, ptr %9, align 4, !tbaa !9
  br label %19, !llvm.loop !16

49:                                               ; preds = %29
  %50 = load i8, ptr %8, align 1, !tbaa !11, !range !13, !noundef !14
  %51 = trunc i8 %50 to i1
  br i1 %51, label %52, label %55

52:                                               ; preds = %49
  %53 = load i32, ptr %5, align 4, !tbaa !9
  %54 = add nsw i32 %53, 1
  store i32 %54, ptr %5, align 4, !tbaa !9
  br label %55

55:                                               ; preds = %52, %49
  call void @llvm.lifetime.end.p0(i64 1, ptr %8) #3
  br label %56

56:                                               ; preds = %55
  %57 = load i32, ptr %6, align 4, !tbaa !9
  %58 = add nsw i32 %57, 1
  store i32 %58, ptr %6, align 4, !tbaa !9
  br label %10, !llvm.loop !18

59:                                               ; preds = %17
  %60 = load i32, ptr %5, align 4, !tbaa !9
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %60
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) #2 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #0 align 2

; 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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = !{!7, !7, i64 0}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = distinct !{!18, !17}


; 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 uwtable
define dso_local noundef i32 @_Z17contaPosPossiveisNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef nonnull %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  %4 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #2
  br label %.preheader

.preheader:                                       ; preds = %2, %._crit_edge
  %indvars.iv22 = phi i64 [ 0, %2 ], [ %indvars.iv.next23, %._crit_edge ]
  %.01319 = phi i32 [ 0, %2 ], [ %spec.select, %._crit_edge ]
  %5 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #2
  %.not21 = icmp eq i64 %5, 0
  br i1 %.not21, label %._crit_edge, label %.lr.ph

6:                                                ; preds = %._crit_edge
  ret i32 %spec.select

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.011.lcssa = phi i8 [ 1, %.preheader ], [ %spec.select16, %.lr.ph ]
  %.mask = and i8 %.011.lcssa, 1
  %7 = zext nneg i8 %.mask to i32
  %spec.select = add nuw nsw i32 %.01319, %7
  %indvars.iv.next23 = add nuw nsw i64 %indvars.iv22, 1
  %8 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  %9 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #2
  %10 = sub i64 %8, %9
  %.not.not = icmp ugt i64 %10, %indvars.iv22
  br i1 %.not.not, label %.preheader, label %6, !llvm.loop !5

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.preheader ]
  %.01117 = phi i8 [ %spec.select16, %.lr.ph ], [ 1, %.preheader ]
  %11 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %indvars.iv)
  %12 = load i8, ptr %11, align 1, !tbaa !7
  %13 = add nuw nsw i64 %indvars.iv, %indvars.iv22
  %14 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %13)
  %15 = load i8, ptr %14, align 1, !tbaa !7
  %16 = icmp eq i8 %12, %15
  %spec.select16 = select i1 %16, i8 0, i8 %.01117
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %17 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #2
  %18 = icmp ugt i64 %17, %indvars.iv.next
  %19 = trunc nuw i8 %spec.select16 to i1
  %20 = select i1 %18, i1 %19, i1 false
  br i1 %20, label %.lr.ph, label %._crit_edge, !llvm.loop !10
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #0 align 2

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 = { 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 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = distinct !{!10, !6}


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