; LLVM IR from TheAlgorithms/C-Plus-Plus :: backtracking (subset_sum)

; 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 @_ZN12backtracking10subset_sum17number_of_subsetsEiRKSt6vectorIiSaIiEE(i32 noundef %0, ptr noundef nonnull align 8 dereferenceable(24) %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %11 = load ptr, ptr %4, align 8, !tbaa !9
  %12 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #2
  %13 = trunc i64 %12 to i32
  store i32 %13, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %52, %2
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = shl i32 1, %16
  %18 = icmp slt i32 %15, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %14
  store i32 2, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %55

20:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %41, %20
  %22 = load i32, ptr %10, align 4, !tbaa !5
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %21
  store i32 5, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %44

26:                                               ; preds = %21
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = load i32, ptr %10, align 4, !tbaa !5
  %29 = shl i32 1, %28
  %30 = and i32 %27, %29
  %31 = icmp ne i32 %30, 0
  br i1 %31, label %32, label %40

32:                                               ; preds = %26
  %33 = load ptr, ptr %4, align 8, !tbaa !9
  %34 = load i32, ptr %10, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %33, i64 noundef %35) #2
  %37 = load i32, ptr %36, align 4, !tbaa !5
  %38 = load i32, ptr %9, align 4, !tbaa !5
  %39 = add nsw i32 %38, %37
  store i32 %39, ptr %9, align 4, !tbaa !5
  br label %40

40:                                               ; preds = %32, %26
  br label %41

41:                                               ; preds = %40
  %42 = load i32, ptr %10, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %10, align 4, !tbaa !5
  br label %21, !llvm.loop !13

44:                                               ; preds = %25
  %45 = load i32, ptr %9, align 4, !tbaa !5
  %46 = load i32, ptr %3, align 4, !tbaa !5
  %47 = icmp eq i32 %45, %46
  br i1 %47, label %48, label %51

48:                                               ; preds = %44
  %49 = load i64, ptr %6, align 8, !tbaa !11
  %50 = add i64 %49, 1
  store i64 %50, ptr %6, align 8, !tbaa !11
  br label %51

51:                                               ; preds = %48, %44
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %52

52:                                               ; preds = %51
  %53 = load i32, ptr %7, align 4, !tbaa !5
  %54 = add nsw i32 %53, 1
  store i32 %54, ptr %7, align 4, !tbaa !5
  br label %14, !llvm.loop !15

55:                                               ; preds = %19
  %56 = load i64, ptr %6, align 8, !tbaa !11
  store i32 1, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i64 %56
}

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #0 align 2

; 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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 nounwind uwtable
define dso_local noundef i64 @_ZN12backtracking10subset_sum17number_of_subsetsEiRKSt6vectorIiSaIiEE(i32 noundef %0, ptr noundef nonnull align 8 dereferenceable(24) %1) local_unnamed_addr #0 {
  %3 = tail call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %1) #2
  %4 = trunc i64 %3 to i32
  %5 = shl nuw i32 1, %4
  %.not = icmp eq i32 %4, 31
  br i1 %.not, label %._crit_edge23, label %.preheader.lr.ph

.preheader.lr.ph:                                 ; preds = %2
  %6 = icmp sgt i32 %4, 0
  br i1 %6, label %.preheader.us.preheader, label %.preheader.lr.ph.split

.preheader.us.preheader:                          ; preds = %.preheader.lr.ph
  %smax27 = tail call i32 @llvm.smax.i32(i32 %5, i32 1)
  %wide.trip.count = and i64 %3, 2147483647
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %.01622.us = phi i32 [ %18, %._crit_edge.us ], [ 0, %.preheader.us.preheader ]
  %.01721.us = phi i64 [ %spec.select.us, %._crit_edge.us ], [ 0, %.preheader.us.preheader ]
  br label %7

7:                                                ; preds = %.preheader.us, %15
  %indvars.iv = phi i64 [ 0, %.preheader.us ], [ %indvars.iv.next, %15 ]
  %.01519.us = phi i32 [ 0, %.preheader.us ], [ %.1.us, %15 ]
  %8 = trunc nuw nsw i64 %indvars.iv to i32
  %9 = shl nuw i32 1, %8
  %10 = and i32 %9, %.01622.us
  %.not.us = icmp eq i32 %10, 0
  br i1 %.not.us, label %15, label %11

11:                                               ; preds = %7
  %12 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %indvars.iv) #2
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = add nsw i32 %13, %.01519.us
  br label %15

15:                                               ; preds = %11, %7
  %.1.us = phi i32 [ %14, %11 ], [ %.01519.us, %7 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge.us, label %7, !llvm.loop !9

._crit_edge.us:                                   ; preds = %15
  %16 = icmp eq i32 %.1.us, %0
  %17 = zext i1 %16 to i64
  %spec.select.us = add i64 %.01721.us, %17
  %18 = add nuw nsw i32 %.01622.us, 1
  %exitcond28.not = icmp eq i32 %18, %smax27
  br i1 %exitcond28.not, label %._crit_edge23, label %.preheader.us, !llvm.loop !11

.preheader.lr.ph.split:                           ; preds = %.preheader.lr.ph
  %19 = icmp eq i32 %0, 0
  %smax = tail call i32 @llvm.smax.i32(i32 %5, i32 1)
  %narrow = select i1 %19, i32 %smax, i32 0
  %20 = zext nneg i32 %narrow to i64
  br label %._crit_edge23

._crit_edge23:                                    ; preds = %._crit_edge.us, %.preheader.lr.ph.split, %2
  %.017.lcssa = phi i64 [ 0, %2 ], [ %20, %.preheader.lr.ph.split ], [ %spec.select.us, %._crit_edge.us ]
  ret i64 %.017.lcssa
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #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 speculatable willreturn memory(none) }
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}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass