; LLVM IR from TheAlgorithms/C-Plus-Plus :: math/aliquot_sum.ll (ZN4math11aliquot_sumEm)

; 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 i64 @_ZN4math11aliquot_sumEm(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  %6 = load i64, ptr %3, align 8, !tbaa !5
  %7 = icmp eq i64 %6, 0
  br i1 %7, label %11, label %8

8:                                                ; preds = %1
  %9 = load i64, ptr %3, align 8, !tbaa !5
  %10 = icmp eq i64 %9, 1
  br i1 %10, label %11, label %12

11:                                               ; preds = %8, %1
  store i64 0, ptr %2, align 8
  br label %34

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 1, ptr %5, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %29, %12
  %14 = load i64, ptr %5, align 8, !tbaa !5
  %15 = load i64, ptr %3, align 8, !tbaa !5
  %16 = udiv i64 %15, 2
  %17 = icmp ule i64 %14, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %32

19:                                               ; preds = %13
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = load i64, ptr %5, align 8, !tbaa !5
  %22 = urem i64 %20, %21
  %23 = icmp eq i64 %22, 0
  br i1 %23, label %24, label %28

24:                                               ; preds = %19
  %25 = load i64, ptr %5, align 8, !tbaa !5
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = add i64 %26, %25
  store i64 %27, ptr %4, align 8, !tbaa !5
  br label %28

28:                                               ; preds = %24, %19
  br label %29

29:                                               ; preds = %28
  %30 = load i64, ptr %5, align 8, !tbaa !5
  %31 = add i64 %30, 1
  store i64 %31, ptr %5, align 8, !tbaa !5
  br label %13, !llvm.loop !9

32:                                               ; preds = %18
  %33 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %33, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %34

34:                                               ; preds = %32, %11
  %35 = load i64, ptr %2, align 8
  ret i64 %35
}

; 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 = !{!"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 i64 @_ZN4math11aliquot_sumEm(i64 noundef %0) local_unnamed_addr #0 {
  %or.cond = icmp ult i64 %0, 2
  br i1 %or.cond, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %2 = lshr i64 %0, 1
  %3 = icmp eq i64 %2, 1
  br i1 %3, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %2, 9223372036854775806
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.017 = phi i64 [ 1, %.lr.ph.preheader.new ], [ %11, %.lr.ph ]
  %.01216 = phi i64 [ 0, %.lr.ph.preheader.new ], [ %spec.select.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %4 = urem i64 %0, %.017
  %5 = icmp eq i64 %4, 0
  %6 = select i1 %5, i64 %.017, i64 0
  %spec.select = add i64 %6, %.01216
  %7 = add nuw i64 %.017, 1
  %8 = urem i64 %0, %7
  %9 = icmp eq i64 %8, 0
  %10 = select i1 %9, i64 %7, i64 0
  %spec.select.1 = add i64 %10, %spec.select
  %11 = add nuw i64 %.017, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !5

.loopexit.loopexit.unr-lcssa:                     ; preds = %.lr.ph, %.lr.ph.preheader
  %spec.select.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %spec.select.1, %.lr.ph ]
  %.017.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %11, %.lr.ph ]
  %.01216.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %spec.select.1, %.lr.ph ]
  %12 = and i64 %0, 2
  %lcmp.mod.not = icmp eq i64 %12, 0
  br i1 %lcmp.mod.not, label %.loopexit, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %.loopexit.loopexit.unr-lcssa
  %13 = urem i64 %0, %.017.unr
  %14 = icmp eq i64 %13, 0
  %15 = select i1 %14, i64 %.017.unr, i64 0
  %spec.select.epil = add i64 %15, %.01216.unr
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph.epil, %.loopexit.loopexit.unr-lcssa, %1
  %.013 = phi i64 [ 0, %1 ], [ %spec.select.lcssa.ph, %.loopexit.loopexit.unr-lcssa ], [ %spec.select.epil, %.lr.ph.epil ]
  ret i64 %.013
}

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: GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass