; LLVM IR from chkn/logdb :: src (logdb_io)

; 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: nounwind uwtable
define dso_local i64 @logdb_io_read(i32 noundef %0, ptr noundef %1, i64 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  store i64 %2, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %9 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %9, ptr %8, align 8, !tbaa !9
  br label %10

10:                                               ; preds = %21, %3
  %11 = load i64, ptr %6, align 8, !tbaa !11
  %12 = icmp ugt i64 %11, 0
  br i1 %12, label %13, label %19

13:                                               ; preds = %10
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load ptr, ptr %8, align 8, !tbaa !9
  %16 = load i64, ptr %6, align 8, !tbaa !11
  %17 = call i64 @read(i32 noundef %14, ptr noundef %15, i64 noundef %16)
  store i64 %17, ptr %7, align 8, !tbaa !11
  %18 = icmp sgt i64 %17, 0
  br label %19

19:                                               ; preds = %13, %10
  %20 = phi i1 [ false, %10 ], [ %18, %13 ]
  br i1 %20, label %21, label %28

21:                                               ; preds = %19
  %22 = load i64, ptr %7, align 8, !tbaa !11
  %23 = load ptr, ptr %8, align 8, !tbaa !9
  %24 = getelementptr inbounds i8, ptr %23, i64 %22
  store ptr %24, ptr %8, align 8, !tbaa !9
  %25 = load i64, ptr %7, align 8, !tbaa !11
  %26 = load i64, ptr %6, align 8, !tbaa !11
  %27 = sub i64 %26, %25
  store i64 %27, ptr %6, align 8, !tbaa !11
  br label %10, !llvm.loop !13

28:                                               ; preds = %19
  %29 = load i64, ptr %7, align 8, !tbaa !11
  %30 = icmp eq i64 %29, 0
  br i1 %30, label %31, label %32

31:                                               ; preds = %28
  br label %34

32:                                               ; preds = %28
  %33 = load i64, ptr %6, align 8, !tbaa !11
  br label %34

34:                                               ; preds = %32, %31
  %35 = phi i64 [ -1, %31 ], [ %33, %32 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  ret i64 %35
}

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

declare i64 @read(i32 noundef, ptr noundef, i64 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: nofree nounwind uwtable
define dso_local noundef i64 @logdb_io_read(i32 noundef %0, ptr nocapture noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %.not14 = icmp eq i64 %2, 0
  br i1 %.not14, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %6
  %.016 = phi ptr [ %7, %6 ], [ %1, %3 ]
  %.01115 = phi i64 [ %8, %6 ], [ %2, %3 ]
  %4 = tail call i64 @read(i32 noundef %0, ptr noundef %.016, i64 noundef %.01115) #2
  %5 = icmp sgt i64 %4, 0
  br i1 %5, label %6, label %.critedge.loopexit

6:                                                ; preds = %.lr.ph
  %7 = getelementptr inbounds i8, ptr %.016, i64 %4
  %8 = sub i64 %.01115, %4
  %.not = icmp eq i64 %8, 0
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !5

.critedge.loopexit:                               ; preds = %.lr.ph
  %9 = icmp eq i64 %4, 0
  %spec.select = select i1 %9, i64 -1, i64 %.01115
  br label %.critedge

.critedge:                                        ; preds = %6, %.critedge.loopexit, %3
  %.1 = phi i64 [ 0, %3 ], [ %spec.select, %.critedge.loopexit ], [ 0, %6 ]
  ret i64 %.1
}

; Function Attrs: nofree
declare noundef i64 @read(i32 noundef, ptr nocapture noundef, i64 noundef) local_unnamed_addr #1

attributes #0 = { 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 = { nofree "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 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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