; LLVM IR from kazunetakahashi/atcoder :: 2019/0602_AGC034/A.ll (Z5solveii)

; 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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@_Z1SB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z5solveii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %8 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %8, ptr %6, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %33, %2
  %10 = load i32, ptr %6, align 4, !tbaa !5
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = sub nsw i32 %11, 2
  %13 = icmp slt i32 %10, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %9
  store i32 2, ptr %7, align 4
  br label %36

15:                                               ; preds = %9
  %16 = load i32, ptr %6, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  %18 = sext i32 %17 to i64
  %19 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1SB5cxx11, i64 noundef %18)
  %20 = load i8, ptr %19, align 1, !tbaa !9
  %21 = sext i8 %20 to i32
  %22 = icmp eq i32 %21, 35
  br i1 %22, label %23, label %32

23:                                               ; preds = %15
  %24 = load i32, ptr %6, align 4, !tbaa !5
  %25 = add nsw i32 %24, 2
  %26 = sext i32 %25 to i64
  %27 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1SB5cxx11, i64 noundef %26)
  %28 = load i8, ptr %27, align 1, !tbaa !9
  %29 = sext i8 %28 to i32
  %30 = icmp eq i32 %29, 35
  br i1 %30, label %31, label %32

31:                                               ; preds = %23
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %36

32:                                               ; preds = %23, %15
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %6, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %6, align 4, !tbaa !5
  br label %9, !llvm.loop !10

36:                                               ; preds = %31, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %37 = load i32, ptr %7, align 4
  switch i32 %37, label %41 [
    i32 2, label %38
    i32 1, label %39
  ]

38:                                               ; preds = %36
  store i1 true, ptr %3, align 1
  br label %39

39:                                               ; preds = %38, %36
  %40 = load i1, ptr %3, align 1
  ret i1 %40

41:                                               ; preds = %36
  unreachable
}

; 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 nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #2 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@_Z1SB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5solveii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = add nsw i32 %1, -2
  %.not = icmp sgt i32 %3, %0
  br i1 %.not, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %4 = sext i32 %0 to i64
  %5 = sext i32 %3 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %15
  %indvars.iv = phi i64 [ %4, %.lr.ph.preheader ], [ %indvars.iv.next, %15 ]
  %6 = phi i1 [ false, %.lr.ph.preheader ], [ %16, %15 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %7 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1SB5cxx11, i64 noundef %indvars.iv.next)
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %9 = icmp eq i8 %8, 35
  br i1 %9, label %10, label %15

10:                                               ; preds = %.lr.ph
  %11 = add nsw i64 %indvars.iv, 2
  %12 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1SB5cxx11, i64 noundef %11)
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %14 = icmp eq i8 %13, 35
  br i1 %14, label %._crit_edge, label %15

15:                                               ; preds = %.lr.ph, %10
  %16 = icmp sge i64 %indvars.iv.next, %5
  %exitcond = icmp eq i64 %indvars.iv.next, %5
  br i1 %exitcond, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %15, %10, %2
  %.lcssa = phi i1 [ true, %2 ], [ %6, %10 ], [ %16, %15 ]
  ret i1 %.lcssa
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #0 align 2

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" }

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


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