; LLVM IR from MakeContributions/DSA :: algorithms/CPlusPlus/Number-system/decimal_to_binary.ll (Z15decimaltobinaryi)

; 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 @_Z15decimaltobinaryi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 1, ptr %3, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %9, %1
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = icmp sle i32 %6, %7
  br i1 %8, label %9, label %12

9:                                                ; preds = %5
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = mul nsw i32 %10, 2
  store i32 %11, ptr %3, align 4, !tbaa !5
  br label %5, !llvm.loop !9

12:                                               ; preds = %5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = sdiv i32 %13, 2
  store i32 %14, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %15

15:                                               ; preds = %18, %12
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = icmp sge i32 %16, 1
  br i1 %17, label %18, label %34

18:                                               ; preds = %15
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = mul nsw i32 %19, 10
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = sdiv i32 %21, %22
  %24 = add nsw i32 %20, %23
  store i32 %24, ptr %4, align 4, !tbaa !5
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = sdiv i32 %26, %27
  %29 = mul nsw i32 %25, %28
  %30 = load i32, ptr %2, align 4, !tbaa !5
  %31 = sub nsw i32 %30, %29
  store i32 %31, ptr %2, align 4, !tbaa !5
  %32 = load i32, ptr %3, align 4, !tbaa !5
  %33 = sdiv i32 %32, 2
  store i32 %33, ptr %3, align 4, !tbaa !5
  br label %15, !llvm.loop !11

34:                                               ; preds = %15
  %35 = load i32, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %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 = !{!"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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z15decimaltobinaryi(i32 noundef %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %2, %1
  %.014 = phi i32 [ 1, %1 ], [ %3, %2 ]
  %.not = icmp sgt i32 %.014, %0
  %3 = shl nsw i32 %.014, 1
  br i1 %.not, label %.preheader, label %2, !llvm.loop !5

.preheader:                                       ; preds = %2
  %.not1718 = icmp ult i32 %.014, 2
  br i1 %.not1718, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.021 = phi i32 [ %6, %.lr.ph ], [ 0, %.preheader ]
  %.1.in20 = phi i32 [ %.1, %.lr.ph ], [ %.014, %.preheader ]
  %.01519 = phi i32 [ %.recomposed, %.lr.ph ], [ %0, %.preheader ]
  %.1 = lshr i32 %.1.in20, 1
  %4 = mul nsw i32 %.021, 10
  %5 = sdiv i32 %.01519, %.1
  %6 = add nsw i32 %5, %4
  %7 = mul nsw i32 %5, %.1
  %.recomposed = srem i32 %.01519, %.1
  %.not17 = icmp ult i32 %.1.in20, 4
  br i1 %.not17, label %._crit_edge, label %.lr.ph, !llvm.loop !7

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.0.lcssa = phi i32 [ 0, %.preheader ], [ %6, %.lr.ph ]
  ret i32 %.0.lcssa
}

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"}
!7 = distinct !{!7, !6}


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