; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/动态规划/斯坦纳树（边权）.ll (Z5checki)

; 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"

@k = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5checki(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 0, 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 %5

5:                                                ; preds = %20, %1
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = icmp ne i32 %6, 0
  br i1 %7, label %9, label %8

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

9:                                                ; preds = %5
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = and i32 %10, 1
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = load i32, ptr @k, align 4, !tbaa !5
  %14 = icmp slt i32 %12, %13
  %15 = zext i1 %14 to i64
  %16 = select i1 %14, i32 1, i32 -1
  %17 = mul nsw i32 %11, %16
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = add nsw i32 %18, %17
  store i32 %19, ptr %3, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %9
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %4, align 4, !tbaa !5
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = ashr i32 %23, 1
  store i32 %24, ptr %2, align 4, !tbaa !5
  br label %5, !llvm.loop !9

25:                                               ; preds = %8
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = icmp eq i32 %26, 0
  %28 = zext i1 %27 to i64
  %29 = select i1 %27, i1 true, i1 false
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i1 %29
}

; 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"}


; 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"

@k = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z5checki(i32 noundef %0) local_unnamed_addr #0 {
  %.not9 = icmp eq i32 %0, 0
  br i1 %.not9, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %2 = load i32, ptr @k, align 4, !tbaa !5
  br label %4

._crit_edge.loopexit:                             ; preds = %4
  %3 = icmp eq i32 %9, 0
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %1
  %.07.lcssa = phi i1 [ true, %1 ], [ %3, %._crit_edge.loopexit ]
  ret i1 %.07.lcssa

4:                                                ; preds = %.lr.ph, %4
  %.012 = phi i32 [ 0, %.lr.ph ], [ %10, %4 ]
  %.0711 = phi i32 [ 0, %.lr.ph ], [ %9, %4 ]
  %.0810 = phi i32 [ %0, %.lr.ph ], [ %11, %4 ]
  %5 = and i32 %.0810, 1
  %6 = icmp slt i32 %.012, %2
  %7 = sub nsw i32 0, %5
  %8 = select i1 %6, i32 %5, i32 %7
  %9 = add nsw i32 %8, %.0711
  %10 = add nuw nsw i32 %.012, 1
  %11 = ashr i32 %.0810, 1
  %.not = icmp ult i32 %.0810, 2
  br i1 %.not, label %._crit_edge.loopexit, label %4, !llvm.loop !9
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: 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 = !{!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"}


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