; LLVM IR from tangjz/acm-icpc :: 51nod/1162.ll (Z4readRn)

; 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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z4readRn(ptr noundef nonnull align 16 dereferenceable(16) %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca [31 x i8], align 16
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 31, ptr %3) #3
  %5 = getelementptr inbounds [31 x i8], ptr %3, i64 0, i64 0
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %5)
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  store i128 0, ptr %7, align 16, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !11
  br label %8

8:                                                ; preds = %32, %1
  %9 = load i32, ptr %4, align 4, !tbaa !11
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [31 x i8], ptr %3, i64 0, i64 %10
  %12 = load i8, ptr %11, align 1, !tbaa !13
  %13 = icmp ne i8 %12, 0
  br i1 %13, label %15, label %14

14:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %35

15:                                               ; preds = %8
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = load i128, ptr %16, align 16, !tbaa !9
  %18 = shl i128 %17, 3
  %19 = load ptr, ptr %2, align 8, !tbaa !5
  %20 = load i128, ptr %19, align 16, !tbaa !9
  %21 = shl i128 %20, 1
  %22 = add nsw i128 %18, %21
  %23 = load i32, ptr %4, align 4, !tbaa !11
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [31 x i8], ptr %3, i64 0, i64 %24
  %26 = load i8, ptr %25, align 1, !tbaa !13
  %27 = sext i8 %26 to i32
  %28 = sub nsw i32 %27, 48
  %29 = sext i32 %28 to i128
  %30 = add nsw i128 %22, %29
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  store i128 %30, ptr %31, align 16, !tbaa !9
  br label %32

32:                                               ; preds = %15
  %33 = load i32, ptr %4, align 4, !tbaa !11
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %4, align 4, !tbaa !11
  br label %8, !llvm.loop !14

35:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 31, ptr %3) #3
  ret void
}

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

declare i32 @__isoc99_scanf(ptr noundef, ...) #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 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 = { "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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"__int128", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress nofree nounwind uwtable
define dso_local void @_Z4readRn(ptr nocapture noundef nonnull writeonly align 16 dereferenceable(16) %0) local_unnamed_addr #0 {
  %2 = alloca [31 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 31, ptr nonnull %2) #3
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %2)
  store i128 0, ptr %0, align 16, !tbaa !5
  %4 = load i8, ptr %2, align 16, !tbaa !9
  %.not7 = icmp eq i8 %4, 0
  br i1 %.not7, label %5, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph
  store i128 %12, ptr %0, align 16, !tbaa !5
  br label %5

5:                                                ; preds = %._crit_edge, %1
  call void @llvm.lifetime.end.p0(i64 31, ptr nonnull %2) #3
  ret void

.lr.ph:                                           ; preds = %1, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %1 ]
  %6 = phi i8 [ %14, %.lr.ph ], [ %4, %1 ]
  %7 = phi i128 [ %12, %.lr.ph ], [ 0, %1 ]
  %8 = mul i128 %7, 10
  %9 = sext i8 %6 to i32
  %10 = add nsw i32 %9, -48
  %11 = sext i32 %10 to i128
  %12 = add nsw i128 %8, %11
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = getelementptr inbounds [31 x i8], ptr %2, i64 0, i64 %indvars.iv.next
  %14 = load i8, ptr %13, align 1, !tbaa !9
  %.not = icmp eq i8 %14, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !10
}

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

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

attributes #0 = { mustprogress nofree 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "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 = { 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 = !{!"__int128", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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