; LLVM IR from freddiev4/dailyprogrammerchallenges :: Easy Challenges/Challenge 0040 Easy/solutions (solution)

; 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"

@print_numbers.i = external hidden global i32, align 4
@.str = external hidden unnamed_addr constant [4 x i8], align 1
@top = external hidden global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local i32 @print_numbers() #0 {
  %1 = load i32, ptr @print_numbers.i, align 4, !tbaa !5
  %2 = add nsw i32 %1, 1
  store i32 %2, ptr @print_numbers.i, align 4, !tbaa !5
  %3 = load i32, ptr @print_numbers.i, align 4, !tbaa !5
  %4 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %3)
  %5 = load i32, ptr @print_numbers.i, align 4, !tbaa !5
  %6 = load i32, ptr @top, align 4, !tbaa !5
  %7 = sub nsw i32 %5, %6
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %9, label %12

9:                                                ; preds = %0
  %10 = call i32 @print_numbers()
  %11 = icmp ne i32 %10, 0
  br label %12

12:                                               ; preds = %9, %0
  %13 = phi i1 [ false, %0 ], [ %11, %9 ]
  %14 = zext i1 %13 to i32
  ret i32 %14
}

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

attributes #0 = { 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 = { "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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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"

@print_numbers.i = external hidden local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [4 x i8], align 1
@top = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nofree nounwind uwtable
define dso_local noundef i32 @print_numbers() local_unnamed_addr #0 {
  %1 = load i32, ptr @print_numbers.i, align 4, !tbaa !5
  %2 = add nsw i32 %1, 1
  store i32 %2, ptr @print_numbers.i, align 4, !tbaa !5
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %2)
  %4 = load i32, ptr @print_numbers.i, align 4, !tbaa !5
  %5 = load i32, ptr @top, align 4, !tbaa !5
  %.not2.not = icmp eq i32 %4, %5
  br i1 %.not2.not, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %0, %tailrecurse
  %6 = phi i32 [ %9, %tailrecurse ], [ %4, %0 ]
  %7 = add nsw i32 %6, 1
  store i32 %7, ptr @print_numbers.i, align 4, !tbaa !5
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %7)
  %9 = load i32, ptr @print_numbers.i, align 4, !tbaa !5
  %10 = load i32, ptr @top, align 4, !tbaa !5
  %.not = icmp eq i32 %9, %10
  br i1 %.not, label %tailrecurse._crit_edge, label %tailrecurse

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

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

attributes #0 = { nofree 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 = { 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" }

!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/C++ TBAA"}


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