; LLVM IR from tangjz/acm-icpc :: usaco/Training/Chapter 2 Bigger challenges/frac1.ll (Z3dfsiiii)

; 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"

@n = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsiiii(i32 noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !5
  store i32 %3, ptr %8, align 4, !tbaa !5
  %9 = load i32, ptr %6, align 4, !tbaa !5
  %10 = load i32, ptr %8, align 4, !tbaa !5
  %11 = add nsw i32 %9, %10
  %12 = load i32, ptr @n, align 4, !tbaa !5
  %13 = icmp sgt i32 %11, %12
  br i1 %13, label %14, label %15

14:                                               ; preds = %4
  br label %39

15:                                               ; preds = %4
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = load i32, ptr %6, align 4, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = load i32, ptr %7, align 4, !tbaa !5
  %20 = add nsw i32 %18, %19
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = load i32, ptr %8, align 4, !tbaa !5
  %23 = add nsw i32 %21, %22
  call void @_Z3dfsiiii(i32 noundef %16, i32 noundef %17, i32 noundef %20, i32 noundef %23)
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = load i32, ptr %7, align 4, !tbaa !5
  %26 = add nsw i32 %24, %25
  %27 = load i32, ptr %6, align 4, !tbaa !5
  %28 = load i32, ptr %8, align 4, !tbaa !5
  %29 = add nsw i32 %27, %28
  %30 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %26, i32 noundef %29)
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = load i32, ptr %7, align 4, !tbaa !5
  %33 = add nsw i32 %31, %32
  %34 = load i32, ptr %6, align 4, !tbaa !5
  %35 = load i32, ptr %8, align 4, !tbaa !5
  %36 = add nsw i32 %34, %35
  %37 = load i32, ptr %7, align 4, !tbaa !5
  %38 = load i32, ptr %8, align 4, !tbaa !5
  call void @_Z3dfsiiii(i32 noundef %33, i32 noundef %36, i32 noundef %37, i32 noundef %38)
  br label %39

39:                                               ; preds = %15, %14
  ret void
}

declare i32 @printf(ptr noundef, ...) #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 = { "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++ 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"

@n = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: mustprogress nofree nounwind uwtable
define dso_local void @_Z3dfsiiii(i32 noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = add nsw i32 %1, %3
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp sgt i32 %5, %6
  br i1 %7, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %4, %tailrecurse
  %8 = phi i32 [ %11, %tailrecurse ], [ %5, %4 ]
  %.tr1822 = phi i32 [ %8, %tailrecurse ], [ %1, %4 ]
  %.tr21 = phi i32 [ %9, %tailrecurse ], [ %0, %4 ]
  %9 = add nsw i32 %.tr21, %2
  tail call void @_Z3dfsiiii(i32 noundef %.tr21, i32 noundef %.tr1822, i32 noundef %9, i32 noundef %8)
  %10 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %9, i32 noundef %8)
  %11 = add nsw i32 %8, %3
  %12 = load i32, ptr @n, align 4, !tbaa !5
  %13 = icmp sgt i32 %11, %12
  br i1 %13, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %4
  ret void
}

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

attributes #0 = { mustprogress 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++ TBAA"}


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