; LLVM IR from MinaFaried3/Assiut-University-Training---Newcomers :: j-sheet7_recursion/Y-NumberofWays.ll (Z3wayi)

; 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"

@num2 = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3wayi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr @num2, align 4, !tbaa !5
  %6 = icmp sge i32 %4, %5
  br i1 %6, label %7, label %12

7:                                                ; preds = %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = load i32, ptr @num2, align 4, !tbaa !5
  %10 = icmp eq i32 %8, %9
  %11 = zext i1 %10 to i32
  store i32 %11, ptr %2, align 4
  br label %24

12:                                               ; preds = %1
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = add nsw i32 %13, 1
  %15 = call noundef i32 @_Z3wayi(i32 noundef %14)
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = add nsw i32 %16, 2
  %18 = call noundef i32 @_Z3wayi(i32 noundef %17)
  %19 = add nsw i32 %15, %18
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = add nsw i32 %20, 3
  %22 = call noundef i32 @_Z3wayi(i32 noundef %21)
  %23 = add nsw i32 %19, %22
  store i32 %23, ptr %2, align 4
  br label %24

24:                                               ; preds = %12, %7
  %25 = load i32, ptr %2, align 4
  ret i32 %25
}

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" }

!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"

@num2 = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z3wayi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @num2, align 4, !tbaa !5
  %.not8 = icmp sgt i32 %2, %0
  br i1 %.not8, label %tailrecurse, label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %1
  %accumulator.tr.lcssa = phi i32 [ 0, %1 ], [ %11, %tailrecurse ]
  %.tr.lcssa = phi i32 [ %0, %1 ], [ %9, %tailrecurse ]
  %3 = icmp eq i32 %2, %.tr.lcssa
  %4 = zext i1 %3 to i32
  %accumulator.ret.tr = add nsw i32 %accumulator.tr.lcssa, %4
  ret i32 %accumulator.ret.tr

tailrecurse:                                      ; preds = %1, %tailrecurse
  %.tr10 = phi i32 [ %9, %tailrecurse ], [ %0, %1 ]
  %accumulator.tr9 = phi i32 [ %11, %tailrecurse ], [ 0, %1 ]
  %5 = add nsw i32 %.tr10, 1
  %6 = tail call noundef i32 @_Z3wayi(i32 noundef %5)
  %7 = add nsw i32 %.tr10, 2
  %8 = tail call noundef i32 @_Z3wayi(i32 noundef %7)
  %9 = add nsw i32 %.tr10, 3
  %10 = add i32 %6, %accumulator.tr9
  %11 = add i32 %10, %8
  %.not = icmp sgt i32 %2, %9
  br i1 %.not, label %tailrecurse, label %tailrecurse._crit_edge
}

attributes #0 = { mustprogress nofree nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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