; LLVM IR from upupming/algorithm :: acwing/寒假每日一题（入门组）/week6/441. 数字统计.ll (Z4calci)

; 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 @_Z4calci(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %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 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 1, ptr %4, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %28, %1
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %31

12:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %13 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %13, ptr %5, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %17, %12
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = icmp ne i32 %15, 0
  br i1 %16, label %17, label %27

17:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = srem i32 %18, 10
  store i32 %19, ptr %6, align 4, !tbaa !5
  %20 = load i32, ptr %6, align 4, !tbaa !5
  %21 = icmp eq i32 %20, 2
  %22 = zext i1 %21 to i32
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = add nsw i32 %23, %22
  store i32 %24, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = sdiv i32 %25, 10
  store i32 %26, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %14, !llvm.loop !9

27:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %28

28:                                               ; preds = %27
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %4, align 4, !tbaa !5
  br label %7, !llvm.loop !11

31:                                               ; preds = %11
  %32 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %32
}

; 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 @_Z4calci(i32 noundef %0) local_unnamed_addr #0 {
  %.not15 = icmp slt i32 %0, 1
  br i1 %.not15, label %._crit_edge, label %.preheader

.preheader:                                       ; preds = %1, %8
  %.017 = phi i32 [ %6, %8 ], [ 0, %1 ]
  %.01116 = phi i32 [ %9, %8 ], [ 1, %1 ]
  br label %2

._crit_edge:                                      ; preds = %8, %1
  %.0.lcssa = phi i32 [ 0, %1 ], [ %6, %8 ]
  ret i32 %.0.lcssa

2:                                                ; preds = %.preheader, %2
  %.114 = phi i32 [ %.017, %.preheader ], [ %6, %2 ]
  %.01013 = phi i32 [ %.01116, %.preheader ], [ %7, %2 ]
  %3 = srem i32 %.01013, 10
  %4 = icmp eq i32 %3, 2
  %5 = zext i1 %4 to i32
  %6 = add nsw i32 %.114, %5
  %7 = sdiv i32 %.01013, 10
  %.01013.off = add i32 %.01013, 9
  %.not12 = icmp ult i32 %.01013.off, 19
  br i1 %.not12, label %8, label %2, !llvm.loop !5

8:                                                ; preds = %2
  %9 = add nuw i32 %.01116, 1
  %exitcond.not = icmp eq i32 %.01116, %0
  br i1 %exitcond.not, label %._crit_edge, label %.preheader, !llvm.loop !7
}

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: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass