; LLVM IR from xirc/cp-algorithm :: atcoder/abc122/B/main.ll/Z5matchRKNSt7 (cxx1112basic_stringIcSt11char_traitsIcESaIcEEE)

; 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 zeroext i1 @_Z5matchRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr noundef nonnull align 8 dereferenceable(32) %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i8, align 1
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %40, %1
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = sext i32 %8 to i64
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %10) #2
  %12 = icmp ult i64 %9, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %7
  store i32 2, ptr %5, align 4
  br label %43

14:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #2
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = load i32, ptr %4, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %15, i64 noundef %17) #2
  %19 = load i8, ptr %18, align 1, !tbaa !11
  store i8 %19, ptr %6, align 1, !tbaa !11
  %20 = load i8, ptr %6, align 1, !tbaa !11
  %21 = sext i8 %20 to i32
  %22 = icmp ne i32 %21, 65
  br i1 %22, label %23, label %36

23:                                               ; preds = %14
  %24 = load i8, ptr %6, align 1, !tbaa !11
  %25 = sext i8 %24 to i32
  %26 = icmp ne i32 %25, 67
  br i1 %26, label %27, label %36

27:                                               ; preds = %23
  %28 = load i8, ptr %6, align 1, !tbaa !11
  %29 = sext i8 %28 to i32
  %30 = icmp ne i32 %29, 71
  br i1 %30, label %31, label %36

31:                                               ; preds = %27
  %32 = load i8, ptr %6, align 1, !tbaa !11
  %33 = sext i8 %32 to i32
  %34 = icmp ne i32 %33, 84
  br i1 %34, label %35, label %36

35:                                               ; preds = %31
  store i1 false, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %37

36:                                               ; preds = %31, %27, %23, %14
  store i32 0, ptr %5, align 4
  br label %37

37:                                               ; preds = %36, %35
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #2
  %38 = load i32, ptr %5, align 4
  switch i32 %38, label %43 [
    i32 0, label %39
  ]

39:                                               ; preds = %37
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %4, align 4, !tbaa !9
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %4, align 4, !tbaa !9
  br label %7, !llvm.loop !12

43:                                               ; preds = %37, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %44 = load i32, ptr %5, align 4
  switch i32 %44, label %48 [
    i32 2, label %45
    i32 1, label %46
  ]

45:                                               ; preds = %43
  store i1 true, ptr %2, align 1
  br label %46

46:                                               ; preds = %45, %43
  %47 = load i1, ptr %2, align 1
  ret i1 %47

48:                                               ; preds = %43
  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 i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(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 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 = !{!"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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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 nounwind uwtable
define dso_local noundef zeroext i1 @_Z5matchRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr noundef nonnull align 8 dereferenceable(32) %0) local_unnamed_addr #0 {
  %2 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %3 = icmp eq i64 %2, 0
  br i1 %3, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %6
  %indvars.iv = phi i64 [ %indvars.iv.next, %6 ], [ 0, %1 ]
  %4 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv) #1
  %5 = load i8, ptr %4, align 1, !tbaa !5
  switch i8 %5, label %._crit_edge [
    i8 84, label %6
    i8 71, label %6
    i8 67, label %6
    i8 65, label %6
  ]

6:                                                ; preds = %.lr.ph, %.lr.ph, %.lr.ph, %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %7 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %.not = icmp ugt i64 %7, %indvars.iv.next
  br i1 %.not, label %.lr.ph, label %._crit_edge, !llvm.loop !8

._crit_edge:                                      ; preds = %6, %.lr.ph, %1
  %.lcssa = phi i1 [ true, %1 ], [ false, %.lr.ph ], [ true, %6 ]
  ret i1 %.lcssa
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__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" }
attributes #1 = { 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 = !{!"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,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass