; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/cp/Geek-onacci_Number.ll (Z8geek_numiiii)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z8geek_numiiii(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
  %9 = alloca i32, align 4
  %10 = 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 4, ptr %10, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %25, %4
  %12 = load i32, ptr %10, align 4, !tbaa !5
  %13 = load i32, ptr %8, align 4, !tbaa !5
  %14 = icmp sle i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %28

16:                                               ; preds = %11
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = load i32, ptr %6, align 4, !tbaa !5
  %19 = add nsw i32 %17, %18
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = add nsw i32 %19, %20
  store i32 %21, ptr %9, align 4, !tbaa !5
  %22 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %22, ptr %5, align 4, !tbaa !5
  %23 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %23, ptr %6, align 4, !tbaa !5
  %24 = load i32, ptr %9, align 4, !tbaa !5
  store i32 %24, ptr %7, align 4, !tbaa !5
  br label %25

25:                                               ; preds = %16
  %26 = load i32, ptr %10, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %10, align 4, !tbaa !5
  br label %11, !llvm.loop !9

28:                                               ; preds = %15
  %29 = load i32, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  ret i32 %29
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

!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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z8geek_numiiii(i32 noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not14 = icmp sgt i32 %3, 3
  tail call void @llvm.assume(i1 %.not14)
  %5 = add nsw i32 %3, -3
  %6 = add nsw i32 %3, -4
  %xtraiter = and i32 %5, 7
  %7 = icmp ult i32 %6, 7
  br i1 %7, label %._crit_edge.unr-lcssa, label %.new

.new:                                             ; preds = %4
  %unroll_iter = and i32 %5, -8
  br label %.lr.ph

._crit_edge.unr-lcssa:                            ; preds = %.lr.ph, %4
  %.lcssa.ph = phi i32 [ poison, %4 ], [ %25, %.lr.ph ]
  %.01117.unr = phi i32 [ %0, %4 ], [ %21, %.lr.ph ]
  %.01216.unr = phi i32 [ %2, %4 ], [ %25, %.lr.ph ]
  %.01315.unr = phi i32 [ %1, %4 ], [ %23, %.lr.ph ]
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.unr-lcssa, %.lr.ph.epil
  %.01117.epil = phi i32 [ %.01315.epil, %.lr.ph.epil ], [ %.01117.unr, %._crit_edge.unr-lcssa ]
  %.01216.epil = phi i32 [ %9, %.lr.ph.epil ], [ %.01216.unr, %._crit_edge.unr-lcssa ]
  %.01315.epil = phi i32 [ %.01216.epil, %.lr.ph.epil ], [ %.01315.unr, %._crit_edge.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.unr-lcssa ]
  %8 = add i32 %.01216.epil, %.01315.epil
  %9 = add i32 %8, %.01117.epil
  %epil.iter.next = add i32 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i32 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph.epil, %._crit_edge.unr-lcssa
  %.lcssa = phi i32 [ %.lcssa.ph, %._crit_edge.unr-lcssa ], [ %9, %.lr.ph.epil ]
  ret i32 %.lcssa

.lr.ph:                                           ; preds = %.lr.ph, %.new
  %.01117 = phi i32 [ %0, %.new ], [ %21, %.lr.ph ]
  %.01216 = phi i32 [ %2, %.new ], [ %25, %.lr.ph ]
  %.01315 = phi i32 [ %1, %.new ], [ %23, %.lr.ph ]
  %niter = phi i32 [ 0, %.new ], [ %niter.next.7, %.lr.ph ]
  %10 = add i32 %.01216, %.01315
  %11 = add i32 %10, %.01117
  %12 = add i32 %11, %.01216
  %13 = add i32 %12, %.01315
  %14 = add i32 %13, %11
  %15 = add i32 %14, %.01216
  %16 = add i32 %15, %13
  %17 = add i32 %16, %11
  %18 = add i32 %17, %15
  %19 = add i32 %18, %13
  %20 = add i32 %19, %17
  %21 = add i32 %20, %15
  %22 = add i32 %21, %19
  %23 = add i32 %22, %17
  %24 = add i32 %23, %21
  %25 = add i32 %24, %19
  %niter.next.7 = add i32 %niter, 8
  %niter.ncmp.7 = icmp eq i32 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %._crit_edge.unr-lcssa, label %.lr.ph, !llvm.loop !7
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.unroll.disable"}
!7 = distinct !{!7, !8}
!8 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass