; LLVM IR from bytecodealliance/sightglass :: benchmarks/shootout/src (ackermann)

; 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: nounwind uwtable
define dso_local i32 @ackermann(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %8, label %11

8:                                                ; preds = %2
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = add nsw i32 %9, 1
  store i32 %10, ptr %3, align 4
  br label %26

11:                                               ; preds = %2
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %18

14:                                               ; preds = %11
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sub nsw i32 %15, 1
  %17 = call i32 @ackermann(i32 noundef %16, i32 noundef 1)
  store i32 %17, ptr %3, align 4
  br label %26

18:                                               ; preds = %11
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = sub nsw i32 %19, 1
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sub nsw i32 %22, 1
  %24 = call i32 @ackermann(i32 noundef %21, i32 noundef %23)
  %25 = call i32 @ackermann(i32 noundef %20, i32 noundef %24)
  store i32 %25, ptr %3, align 4
  br label %26

26:                                               ; preds = %18, %14, %8
  %27 = load i32, ptr %3, align 4
  ret i32 %27
}

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" }

!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"

; Function Attrs: nofree nosync nounwind memory(none) uwtable
define dso_local range(i32 -2147483647, -2147483648) i32 @ackermann(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %0, 0
  br i1 %3, label %tailrecurse._crit_edge, label %.lr.ph

tailrecurse._crit_edge:                           ; preds = %tailrecurse.backedge, %2
  %.tr10.lcssa = phi i32 [ %1, %2 ], [ %.tr10.be, %tailrecurse.backedge ]
  %4 = add nsw i32 %.tr10.lcssa, 1
  ret i32 %4

.lr.ph:                                           ; preds = %2, %tailrecurse.backedge
  %.tr1012 = phi i32 [ %.tr10.be, %tailrecurse.backedge ], [ %1, %2 ]
  %.tr11 = phi i32 [ %.tr.be, %tailrecurse.backedge ], [ %0, %2 ]
  %5 = icmp eq i32 %.tr1012, 0
  br i1 %5, label %tailrecurse.backedge, label %7

tailrecurse.backedge:                             ; preds = %.lr.ph, %7
  %.tr10.be = phi i32 [ %9, %7 ], [ 1, %.lr.ph ]
  %.tr.be = add nsw i32 %.tr11, -1
  %6 = icmp eq i32 %.tr.be, 0
  br i1 %6, label %tailrecurse._crit_edge, label %.lr.ph

7:                                                ; preds = %.lr.ph
  %8 = add nsw i32 %.tr1012, -1
  %9 = tail call i32 @ackermann(i32 noundef %.tr11, i32 noundef %8)
  br label %tailrecurse.backedge
}

attributes #0 = { nofree nosync nounwind memory(none) 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)"}


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