; LLVM IR from upupming/algorithm :: acwing/算法基础课/第五讲 动态规划/背包问题/2. 01背包问题.ll (Z14loop_optimizedv)

; 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 }

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@v = external dso_local global [1010 x i32], align 16
@w = external dso_local global [1010 x i32], align 16
@g = external dso_local global [1010 x i32], align 16
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z14loop_optimizedv() #3 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #5
  store i32 1, ptr %1, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %47, %0
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = load i32, ptr @n, align 4, !tbaa !5
  %8 = icmp sle i32 %6, %7
  br i1 %8, label %10, label %9

9:                                                ; preds = %5
  store i32 2, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #5
  br label %50

10:                                               ; preds = %5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  %11 = load i32, ptr @m, align 4, !tbaa !5
  store i32 %11, ptr %3, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %43, %10
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = load i32, ptr %1, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [1010 x i32], ptr @v, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = icmp sge i32 %13, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %12
  store i32 5, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  br label %46

20:                                               ; preds = %12
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [1010 x i32], ptr @g, i64 0, i64 %22
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr %1, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [1010 x i32], ptr @v, i64 0, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = sub nsw i32 %24, %28
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [1010 x i32], ptr @g, i64 0, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = load i32, ptr %1, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds [1010 x i32], ptr @w, i64 0, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = add nsw i32 %32, %36
  store i32 %37, ptr %4, align 4, !tbaa !5
  %38 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %23, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %39 = load i32, ptr %38, align 4, !tbaa !5
  %40 = load i32, ptr %3, align 4, !tbaa !5
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds [1010 x i32], ptr @g, i64 0, i64 %41
  store i32 %39, ptr %42, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  br label %43

43:                                               ; preds = %20
  %44 = load i32, ptr %3, align 4, !tbaa !5
  %45 = add nsw i32 %44, -1
  store i32 %45, ptr %3, align 4, !tbaa !5
  br label %12, !llvm.loop !9

46:                                               ; preds = %19
  br label %47

47:                                               ; preds = %46
  %48 = load i32, ptr %1, align 4, !tbaa !5
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %1, align 4, !tbaa !5
  br label %5, !llvm.loop !11

50:                                               ; preds = %9
  %51 = load i32, ptr @m, align 4, !tbaa !5
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds [1010 x i32], ptr @g, i64 0, i64 %52
  %54 = load i32, ptr %53, align 4, !tbaa !5
  %55 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %54)
  %56 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %55, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  ret void
}

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #3 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #4

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 #2 = { "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 = { 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 #4 = { inlinehint 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 #5 = { 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 }

@n = external dso_local local_unnamed_addr global i32, align 4
@m = external dso_local local_unnamed_addr global i32, align 4
@v = external dso_local local_unnamed_addr global [1010 x i32], align 16
@w = external dso_local local_unnamed_addr global [1010 x i32], align 16
@g = external dso_local global [1010 x i32], align 16
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z14loop_optimizedv() local_unnamed_addr #3 {
  %1 = alloca i32, align 4
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %.not14 = icmp slt i32 %2, 1
  br i1 %.not14, label %._crit_edge18, label %.lr.ph17

._crit_edge18:                                    ; preds = %._crit_edge, %0
  %3 = load i32, ptr @m, align 4, !tbaa !5
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [1010 x i32], ptr @g, i64 0, i64 %4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %6)
  %8 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %7, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  ret void

.lr.ph17:                                         ; preds = %0, %._crit_edge
  %9 = phi i32 [ %15, %._crit_edge ], [ %2, %0 ]
  %indvars.iv20 = phi i64 [ %indvars.iv.next21, %._crit_edge ], [ 1, %0 ]
  %10 = load i32, ptr @m, align 4, !tbaa !5
  %11 = getelementptr inbounds [1010 x i32], ptr @v, i64 0, i64 %indvars.iv20
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %.not1112 = icmp slt i32 %10, %12
  br i1 %.not1112, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph17
  %13 = getelementptr inbounds [1010 x i32], ptr @w, i64 0, i64 %indvars.iv20
  %14 = sext i32 %10 to i64
  br label %17

._crit_edge.loopexit:                             ; preds = %17
  %.pre = load i32, ptr @n, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.lr.ph17
  %15 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %9, %.lr.ph17 ]
  %indvars.iv.next21 = add nuw nsw i64 %indvars.iv20, 1
  %16 = sext i32 %15 to i64
  %.not.not = icmp slt i64 %indvars.iv20, %16
  br i1 %.not.not, label %.lr.ph17, label %._crit_edge18, !llvm.loop !9

17:                                               ; preds = %.lr.ph, %17
  %indvars.iv = phi i64 [ %14, %.lr.ph ], [ %indvars.iv.next, %17 ]
  %18 = phi i32 [ %12, %.lr.ph ], [ %28, %17 ]
  %19 = getelementptr inbounds [1010 x i32], ptr @g, i64 0, i64 %indvars.iv
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  %20 = sext i32 %18 to i64
  %21 = sub nsw i64 %indvars.iv, %20
  %22 = getelementptr inbounds [1010 x i32], ptr @g, i64 0, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = load i32, ptr %13, align 4, !tbaa !5
  %25 = add nsw i32 %24, %23
  store i32 %25, ptr %1, align 4, !tbaa !5
  %26 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %19, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %27 = load i32, ptr %26, align 4, !tbaa !5
  store i32 %27, ptr %19, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %28 = load i32, ptr %11, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %.not11.not = icmp sgt i64 %indvars.iv, %29
  br i1 %.not11.not, label %17, label %._crit_edge.loopexit, !llvm.loop !11
}

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #3 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #4

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 #2 = { "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 = { 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 #4 = { inlinehint 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 #5 = { 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: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass