; LLVM IR from tangjz/acm-icpc :: codeforces/gym/101367G.ll (Z7getPrevx)

; 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"

@_ZZ7getPrevxE3buf = external hidden global [31 x i8], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z7getPrevx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  %4 = load i64, ptr %2, align 8, !tbaa !5
  %5 = call i32 (ptr, ptr, ...) @sprintf(ptr noundef @_ZZ7getPrevxE3buf, ptr noundef @.str, i64 noundef %4) #4
  store i32 %5, ptr %3, align 4, !tbaa !9
  %6 = load i32, ptr %3, align 4, !tbaa !9
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds i8, ptr @_ZZ7getPrevxE3buf, i64 %7
  %9 = call noundef zeroext i1 @_ZSt16prev_permutationIPcEbT_S1_(ptr noundef @_ZZ7getPrevxE3buf, ptr noundef %8)
  br i1 %9, label %10, label %16

10:                                               ; preds = %1
  %11 = load i8, ptr @_ZZ7getPrevxE3buf, align 16, !tbaa !11
  %12 = sext i8 %11 to i32
  %13 = icmp ne i32 %12, 48
  br i1 %13, label %14, label %16

14:                                               ; preds = %10
  %15 = call i32 (ptr, ptr, ...) @__isoc99_sscanf(ptr noundef @_ZZ7getPrevxE3buf, ptr noundef @.str, ptr noundef %2) #4
  br label %16

16:                                               ; preds = %14, %10, %1
  %17 = load i64, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  ret i64 %17
}

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

; Function Attrs: nounwind
declare i32 @sprintf(ptr noundef, ptr noundef, ...) #2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZSt16prev_permutationIPcEbT_S1_(ptr noundef, ptr noundef) #3

; Function Attrs: nounwind
declare i32 @__isoc99_sscanf(ptr noundef, 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 = { 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 = { 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 #4 = { 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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}


; 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"

@_ZZ7getPrevxE3buf = external hidden global [31 x i8], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z7getPrevx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  %3 = tail call i32 (ptr, ptr, ...) @sprintf(ptr noundef nonnull dereferenceable(1) @_ZZ7getPrevxE3buf, ptr noundef nonnull dereferenceable(1) @.str, i64 noundef %0) #3
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds i8, ptr @_ZZ7getPrevxE3buf, i64 %4
  %6 = tail call noundef zeroext i1 @_ZSt16prev_permutationIPcEbT_S1_(ptr noundef nonnull @_ZZ7getPrevxE3buf, ptr noundef nonnull %5)
  %7 = load i8, ptr @_ZZ7getPrevxE3buf, align 16
  %8 = icmp ne i8 %7, 48
  %or.cond = select i1 %6, i1 %8, i1 false
  br i1 %or.cond, label %9, label %11

9:                                                ; preds = %1
  %10 = call i32 (ptr, ptr, ...) @__isoc99_sscanf(ptr noundef nonnull @_ZZ7getPrevxE3buf, ptr noundef nonnull @.str, ptr noundef nonnull %2) #3
  %.pre = load i64, ptr %2, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %9, %1
  %12 = phi i64 [ %.pre, %9 ], [ %0, %1 ]
  ret i64 %12
}

; Function Attrs: nofree nounwind
declare noundef i32 @sprintf(ptr noalias nocapture noundef writeonly, ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZSt16prev_permutationIPcEbT_S1_(ptr noundef, ptr noundef) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_sscanf(ptr nocapture noundef readonly, ptr nocapture noundef readonly, ...) local_unnamed_addr #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 = { 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 #2 = { 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 #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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass