; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ (1515（dfs）)

; 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"

@s1 = external dso_local global [123 x i8], align 16
@s2 = external dso_local global [123 x i8], align 16
@len1 = external dso_local global i32, align 4
@len2 = external dso_local global i32, align 4
@.str.2 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsiii(i32 noundef, i32 noundef, i32 noundef) #0

declare i32 @puts(ptr noundef) #1

declare i32 @printf(ptr noundef, ...) #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %1 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %2

2:                                                ; preds = %16, %14, %0
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef @s1, ptr noundef @s2)
  %4 = xor i32 %3, -1
  %5 = icmp ne i32 %4, 0
  br i1 %5, label %6, label %19

6:                                                ; preds = %2
  %7 = call i64 @strlen(ptr noundef @s1) #4
  %8 = trunc i64 %7 to i32
  store i32 %8, ptr @len1, align 4, !tbaa !5
  %9 = call i64 @strlen(ptr noundef @s2) #4
  %10 = trunc i64 %9 to i32
  store i32 %10, ptr @len2, align 4, !tbaa !5
  %11 = load i32, ptr @len1, align 4, !tbaa !5
  %12 = load i32, ptr @len2, align 4, !tbaa !5
  %13 = icmp ne i32 %11, %12
  br i1 %13, label %14, label %16

14:                                               ; preds = %6
  %15 = call i32 @puts(ptr noundef @.str.3)
  br label %2, !llvm.loop !9

16:                                               ; preds = %6
  %17 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  call void @_Z3dfsiii(i32 noundef 0, i32 noundef 0, i32 noundef 0)
  %18 = call i32 @puts(ptr noundef @.str.5)
  br label %2, !llvm.loop !9

19:                                               ; preds = %2
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #3

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 = { "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 = { mustprogress norecurse 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 willreturn memory(read) "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 #4 = { nounwind willreturn memory(read) }

!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"

@s1 = external dso_local global [123 x i8], align 16
@s2 = external dso_local global [123 x i8], align 16
@len1 = external dso_local local_unnamed_addr global i32, align 4
@len2 = external dso_local local_unnamed_addr global i32, align 4
@.str.2 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsiii(i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #2 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull @s1, ptr noundef nonnull @s2)
  %.not2 = icmp eq i32 %1, -1
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.backedge
  %2 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) @s1) #4
  %3 = trunc i64 %2 to i32
  store i32 %3, ptr @len1, align 4, !tbaa !5
  %4 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) @s2) #4
  %5 = trunc i64 %4 to i32
  store i32 %5, ptr @len2, align 4, !tbaa !5
  %.not1 = icmp eq i32 %3, %5
  br i1 %.not1, label %8, label %.backedge

.backedge:                                        ; preds = %.lr.ph, %8
  %.str.3.sink = phi ptr [ @.str.5, %8 ], [ @.str.3, %.lr.ph ]
  %6 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.3.sink)
  %7 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull @s1, ptr noundef nonnull @s2)
  %.not = icmp eq i32 %7, -1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

8:                                                ; preds = %.lr.ph
  %9 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  tail call void @_Z3dfsiii(i32 noundef 0, i32 noundef 0, i32 noundef 0)
  br label %.backedge

._crit_edge:                                      ; preds = %.backedge, %0
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #3

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 = { nofree nounwind "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 = { mustprogress norecurse 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 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 #4 = { nounwind willreturn memory(read) }

!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"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass