; LLVM IR from codemistic/Data-Structures-and-Algorithms :: Arrays (NCRcombination)

; 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 @NCR(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 = load i32, ptr %5, align 4, !tbaa !5
  %8 = icmp eq i32 %6, %7
  br i1 %8, label %12, label %9

9:                                                ; preds = %2
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %9, %2
  store i32 1, ptr %3, align 4
  br label %24

13:                                               ; preds = %9
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = sub nsw i32 %14, 1
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = sub nsw i32 %16, 1
  %18 = call i32 @NCR(i32 noundef %15, i32 noundef %17)
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = sub nsw i32 %19, 1
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = call i32 @NCR(i32 noundef %20, i32 noundef %21)
  %23 = add nsw i32 %18, %22
  store i32 %23, ptr %3, align 4
  br label %24

24:                                               ; preds = %13, %12
  %25 = load i32, ptr %3, align 4
  ret i32 %25
}

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 i32 @NCR(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %1, 0
  %4 = icmp eq i32 %0, %1
  %or.cond12 = or i1 %3, %4
  br i1 %or.cond12, label %tailrecurse._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %5 = add nsw i32 %1, -1
  br label %tailrecurse

tailrecurse:                                      ; preds = %.lr.ph, %tailrecurse
  %.tr14 = phi i32 [ %0, %.lr.ph ], [ %6, %tailrecurse ]
  %accumulator.tr13 = phi i32 [ 0, %.lr.ph ], [ %8, %tailrecurse ]
  %6 = add nsw i32 %.tr14, -1
  %7 = tail call i32 @NCR(i32 noundef %6, i32 noundef %5)
  %8 = add nsw i32 %7, %accumulator.tr13
  %9 = icmp eq i32 %6, %1
  br i1 %9, label %tailrecurse._crit_edge.loopexit, label %tailrecurse

tailrecurse._crit_edge.loopexit:                  ; preds = %tailrecurse
  %10 = add nsw i32 %8, 1
  br label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse._crit_edge.loopexit, %2
  %accumulator.tr.lcssa = phi i32 [ 1, %2 ], [ %10, %tailrecurse._crit_edge.loopexit ]
  ret i32 %accumulator.tr.lcssa
}

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: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass