; LLVM IR from Tinker-Twins/3D-LIDAR-Localization :: fast_gicp/thirdparty/nvbio/contrib/htslib/cram (zfio)

; 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"

%struct.zfp = type { ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local i32 @zfpeek(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.zfp, ptr %4, i32 0, i32 0
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %22

8:                                                ; preds = %1
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.zfp, ptr %9, i32 0, i32 0
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  %12 = call i32 @getc(ptr noundef %11)
  store i32 %12, ptr %3, align 4, !tbaa !11
  %13 = load i32, ptr %3, align 4, !tbaa !11
  %14 = icmp ne i32 %13, -1
  br i1 %14, label %15, label %21

15:                                               ; preds = %8
  %16 = load i32, ptr %3, align 4, !tbaa !11
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.zfp, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !9
  %20 = call i32 @ungetc(i32 noundef %16, ptr noundef %19)
  br label %21

21:                                               ; preds = %15, %8
  br label %36

22:                                               ; preds = %1
  %23 = load ptr, ptr %2, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.zfp, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !13
  %26 = call i32 @gzgetc(ptr noundef %25)
  store i32 %26, ptr %3, align 4, !tbaa !11
  %27 = load i32, ptr %3, align 4, !tbaa !11
  %28 = icmp ne i32 %27, -1
  br i1 %28, label %29, label %35

29:                                               ; preds = %22
  %30 = load i32, ptr %3, align 4, !tbaa !11
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.zfp, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !13
  %34 = call i32 @gzungetc(i32 noundef %30, ptr noundef %33)
  br label %35

35:                                               ; preds = %29, %22
  br label %36

36:                                               ; preds = %35, %21
  %37 = load i32, ptr %3, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %37
}

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

declare i32 @getc(ptr noundef) #2

declare i32 @ungetc(i32 noundef, ptr noundef) #2

declare i32 @gzgetc(ptr noundef) #2

declare i32 @gzungetc(i32 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 = { 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 = { "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/C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"", !6, i64 0, !6, i64 8}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!10, !6, i64 8}


; 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: nounwind uwtable
define dso_local i32 @zfpeek(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %.not = icmp eq ptr %2, null
  br i1 %.not, label %8, label %3

3:                                                ; preds = %1
  %4 = tail call i32 @getc(ptr noundef nonnull %2)
  %.not14 = icmp eq i32 %4, -1
  br i1 %.not14, label %15, label %5

5:                                                ; preds = %3
  %6 = load ptr, ptr %0, align 8, !tbaa !5
  %7 = tail call i32 @ungetc(i32 noundef %4, ptr noundef %6)
  br label %15

8:                                                ; preds = %1
  %9 = getelementptr inbounds i8, ptr %0, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !10
  %11 = tail call i32 @gzgetc(ptr noundef %10) #3
  %.not13 = icmp eq i32 %11, -1
  br i1 %.not13, label %15, label %12

12:                                               ; preds = %8
  %13 = load ptr, ptr %9, align 8, !tbaa !10
  %14 = tail call i32 @gzungetc(i32 noundef %11, ptr noundef %13) #3
  br label %15

15:                                               ; preds = %8, %12, %3, %5
  %.0 = phi i32 [ %4, %5 ], [ -1, %3 ], [ %11, %12 ], [ -1, %8 ]
  ret i32 %.0
}

; Function Attrs: nofree nounwind
declare noundef i32 @getc(ptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @ungetc(i32 noundef, ptr nocapture noundef) local_unnamed_addr #1

declare i32 @gzgetc(ptr noundef) local_unnamed_addr #2

declare i32 @gzungetc(i32 noundef, ptr noundef) local_unnamed_addr #2

attributes #0 = { 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 = { 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 = { "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, !7, i64 0}
!6 = !{!"", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 8}


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