; LLVM IR from Chasmiccoder/Algos-for-Amigos :: Mathematics/Series (p01_fibonacci_series)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z54last_digit_of_sum_of_first_n_fibonacci_numbers_small_nx(i64 noundef %0) #1 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %27, %1
  %9 = load i64, ptr %6, align 8, !tbaa !5
  %10 = load i64, ptr %2, align 8, !tbaa !5
  %11 = icmp slt i64 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %30

13:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %14 = load i64, ptr %4, align 8, !tbaa !5
  %15 = srem i64 %14, 10
  store i64 %15, ptr %7, align 8, !tbaa !5
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %17 = srem i64 %16, 10
  store i64 %17, ptr %4, align 8, !tbaa !5
  %18 = load i64, ptr %3, align 8, !tbaa !5
  %19 = srem i64 %18, 10
  %20 = load i64, ptr %7, align 8, !tbaa !5
  %21 = srem i64 %20, 10
  %22 = add nsw i64 %19, %21
  store i64 %22, ptr %3, align 8, !tbaa !5
  %23 = load i64, ptr %3, align 8, !tbaa !5
  %24 = srem i64 %23, 10
  %25 = load i64, ptr %5, align 8, !tbaa !5
  %26 = add nsw i64 %25, %24
  store i64 %26, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  br label %27

27:                                               ; preds = %13
  %28 = load i64, ptr %6, align 8, !tbaa !5
  %29 = add nsw i64 %28, 1
  store i64 %29, ptr %6, align 8, !tbaa !5
  br label %8, !llvm.loop !9

30:                                               ; preds = %12
  %31 = load i64, ptr %5, align 8, !tbaa !5
  %32 = trunc i64 %31 to i32
  %33 = srem i32 %32, 10
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i32 %33
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"long long", !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 range(i32 -9, 10) i32 @_Z54last_digit_of_sum_of_first_n_fibonacci_numbers_small_nx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp sgt i64 %0, 0
  br i1 %2, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %xtraiter = and i64 %0, 1
  %3 = icmp eq i64 %0, 1
  br i1 %3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %0, 9223372036854775806
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa.loopexit:          ; preds = %.lr.ph
  %4 = srem i64 %15, 10
  br label %._crit_edge.loopexit.unr-lcssa

._crit_edge.loopexit.unr-lcssa:                   ; preds = %._crit_edge.loopexit.unr-lcssa.loopexit, %.lr.ph.preheader
  %.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %17, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %.016.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %4, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %.01114.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %17, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %.01213.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %14, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge.loopexit, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa
  %5 = add nsw i64 %.016.unr, %.01213.unr
  %.lhs.trunc.epil = trunc nsw i64 %5 to i8
  %6 = srem i8 %.lhs.trunc.epil, 10
  %.sext.epil = sext i8 %6 to i64
  %7 = add nsw i64 %.01114.unr, %.sext.epil
  br label %._crit_edge.loopexit

._crit_edge.loopexit:                             ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %.lcssa = phi i64 [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %7, %.lr.ph.epil ]
  %8 = trunc i64 %.lcssa to i32
  %9 = srem i32 %8, 10
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %1
  %.011.lcssa = phi i32 [ 0, %1 ], [ %9, %._crit_edge.loopexit ]
  ret i32 %.011.lcssa

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.016 = phi i64 [ 0, %.lr.ph.preheader.new ], [ %15, %.lr.ph ]
  %.01114 = phi i64 [ 0, %.lr.ph.preheader.new ], [ %17, %.lr.ph ]
  %.01213 = phi i64 [ 1, %.lr.ph.preheader.new ], [ %14, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %10 = srem i64 %.016, 10
  %11 = add nsw i64 %10, %.01213
  %.lhs.trunc = trunc nsw i64 %11 to i8
  %12 = srem i8 %.lhs.trunc, 10
  %.sext = sext i8 %12 to i64
  %13 = add nsw i64 %.01114, %.sext
  %14 = srem i64 %11, 10
  %15 = add nsw i64 %14, %10
  %.lhs.trunc.1 = trunc nsw i64 %15 to i8
  %16 = srem i8 %.lhs.trunc.1, 10
  %.sext.1 = sext i8 %16 to i64
  %17 = add nsw i64 %13, %.sext.1
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.loopexit.unr-lcssa.loopexit, label %.lr.ph, !llvm.loop !5
}

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" }

!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.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass