; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Levels/Level - 2/Arrays/FactorialOfLargeNumber.ll (Z4facti)

; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z8multiplyPiii(ptr noundef, i32 noundef, i32 noundef) #0

; 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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z4facti(i32 noundef %0) #2 {
  %2 = alloca i32, align 4
  %3 = alloca [100000 x i32], align 16
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 400000, ptr %3) #4
  %7 = getelementptr inbounds [100000 x i32], ptr %3, i64 0, i64 0
  store i32 1, ptr %7, align 16, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  store i32 1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 1, ptr %5, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %18, %1
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = icmp sle i32 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %21

13:                                               ; preds = %8
  %14 = getelementptr inbounds [100000 x i32], ptr %3, i64 0, i64 0
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = call noundef i32 @_Z8multiplyPiii(ptr noundef %14, i32 noundef %15, i32 noundef %16)
  store i32 %17, ptr %4, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %13
  %19 = load i32, ptr %5, align 4, !tbaa !5
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %5, align 4, !tbaa !5
  br label %8, !llvm.loop !9

21:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = sub nsw i32 %22, 1
  store i32 %23, ptr %6, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %34, %21
  %25 = load i32, ptr %6, align 4, !tbaa !5
  %26 = icmp sge i32 %25, 0
  br i1 %26, label %28, label %27

27:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %37

28:                                               ; preds = %24
  %29 = load i32, ptr %6, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [100000 x i32], ptr %3, i64 0, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %32)
  br label %34

34:                                               ; preds = %28
  %35 = load i32, ptr %6, align 4, !tbaa !5
  %36 = add nsw i32 %35, -1
  store i32 %36, ptr %6, align 4, !tbaa !5
  br label %24, !llvm.loop !11

37:                                               ; preds = %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 400000, ptr %3) #4
  ret void
}

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #3

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 = { 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" }
attributes #3 = { "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 #4 = { 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"}
!11 = distinct !{!11, !10}


; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z8multiplyPiii(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

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

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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z4facti(i32 noundef %0) local_unnamed_addr #2 {
  %2 = alloca [100000 x i32], align 16
  call void @llvm.lifetime.start.p0(i64 400000, ptr nonnull %2) #4
  store i32 1, ptr %2, align 16, !tbaa !5
  %.not11 = icmp slt i32 %0, 1
  br i1 %.not11, label %.lr.ph15.preheader, label %.lr.ph

.preheader:                                       ; preds = %.lr.ph
  %3 = icmp sgt i32 %5, 0
  br i1 %3, label %.lr.ph15.preheader, label %._crit_edge

.lr.ph15.preheader:                               ; preds = %1, %.preheader
  %.010.lcssa18 = phi i32 [ %5, %.preheader ], [ 1, %1 ]
  %4 = zext nneg i32 %.010.lcssa18 to i64
  br label %.lr.ph15

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.0913 = phi i32 [ %6, %.lr.ph ], [ 1, %1 ]
  %.01012 = phi i32 [ %5, %.lr.ph ], [ 1, %1 ]
  %5 = call noundef i32 @_Z8multiplyPiii(ptr noundef nonnull %2, i32 noundef %.0913, i32 noundef %.01012)
  %6 = add nuw i32 %.0913, 1
  %exitcond.not = icmp eq i32 %.0913, %0
  br i1 %exitcond.not, label %.preheader, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph15, %.preheader
  call void @llvm.lifetime.end.p0(i64 400000, ptr nonnull %2) #4
  ret void

.lr.ph15:                                         ; preds = %.lr.ph15.preheader, %.lr.ph15
  %indvars.iv = phi i64 [ %4, %.lr.ph15.preheader ], [ %indvars.iv.next, %.lr.ph15 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %7 = getelementptr inbounds [100000 x i32], ptr %2, i64 0, i64 %indvars.iv.next
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %8)
  %10 = icmp ugt i64 %indvars.iv, 1
  br i1 %10, label %.lr.ph15, label %._crit_edge, !llvm.loop !11
}

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #3

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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" }
attributes #3 = { "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 #4 = { 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"}
!11 = distinct !{!11, !10}


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