; LLVM IR from lzyrapx/Competitive-Programming :: 百度之星/2016 Astar Contest - Round 2A/1005-BD String.ll (Z4workx)

; 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 @_Z4workx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %23, %1
  %7 = load i64, ptr %2, align 8, !tbaa !5
  %8 = icmp ne i64 %7, 0
  br i1 %8, label %9, label %31

9:                                                ; preds = %6
  %10 = load i64, ptr %2, align 8, !tbaa !5
  %11 = and i64 %10, 1
  %12 = icmp ne i64 %11, 0
  br i1 %12, label %13, label %23

13:                                               ; preds = %9
  %14 = load i64, ptr %4, align 8, !tbaa !5
  %15 = load i64, ptr %2, align 8, !tbaa !5
  %16 = ashr i64 %15, 1
  %17 = and i64 %16, 1
  %18 = icmp eq i64 %17, 0
  %19 = zext i1 %18 to i64
  %20 = add nsw i64 %14, %19
  %21 = load i64, ptr %3, align 8, !tbaa !5
  %22 = add nsw i64 %21, %20
  store i64 %22, ptr %3, align 8, !tbaa !5
  br label %23

23:                                               ; preds = %13, %9
  %24 = load i64, ptr %4, align 8, !tbaa !5
  %25 = load i64, ptr %5, align 8, !tbaa !5
  %26 = add nsw i64 %24, %25
  store i64 %26, ptr %5, align 8, !tbaa !5
  store i64 %26, ptr %4, align 8, !tbaa !5
  %27 = load i64, ptr %4, align 8, !tbaa !5
  %28 = add nsw i64 %27, 1
  store i64 %28, ptr %4, align 8, !tbaa !5
  %29 = load i64, ptr %2, align 8, !tbaa !5
  %30 = ashr i64 %29, 1
  store i64 %30, ptr %2, align 8, !tbaa !5
  br label %6, !llvm.loop !9

31:                                               ; preds = %6
  %32 = load i64, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %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 = !{!"long long", !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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z4workx(i64 noundef %0) local_unnamed_addr #0 {
  %.not14 = icmp eq i64 %0, 0
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %8
  %.018 = phi i64 [ %9, %8 ], [ 0, %1 ]
  %.01017 = phi i64 [ %10, %8 ], [ 0, %1 ]
  %.01116 = phi i64 [ %.1, %8 ], [ 0, %1 ]
  %.01215 = phi i64 [ %11, %8 ], [ %0, %1 ]
  %2 = and i64 %.01215, 1
  %.not13 = icmp eq i64 %2, 0
  br i1 %.not13, label %8, label %3

3:                                                ; preds = %.lr.ph
  %4 = lshr i64 %.01215, 1
  %.lobit = and i64 %4, 1
  %5 = xor i64 %.lobit, 1
  %6 = add i64 %.01017, %.01116
  %7 = add i64 %6, %5
  br label %8

8:                                                ; preds = %3, %.lr.ph
  %.1 = phi i64 [ %7, %3 ], [ %.01116, %.lr.ph ]
  %9 = add nsw i64 %.018, %.01017
  %10 = add nsw i64 %9, 1
  %11 = ashr i64 %.01215, 1
  %.not = icmp ult i64 %.01215, 2
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %8, %1
  %.011.lcssa = phi i64 [ 0, %1 ], [ %.1, %8 ]
  ret i64 %.011.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"}


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