; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i64 @logdb_io_pread(i32 noundef %0, ptr noundef %1, i64 noundef %2, i64 noundef %3) #1 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  %10 = alloca ptr, align 8
  store i32 %0, ptr %5, align 4, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !9
  store i64 %2, ptr %7, align 8, !tbaa !11
  store i64 %3, ptr %8, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #3
  %11 = load ptr, ptr %6, align 8, !tbaa !9
  store ptr %11, ptr %10, align 8, !tbaa !9
  br label %12

12:                                               ; preds = %24, %4
  %13 = load i64, ptr %7, align 8, !tbaa !11
  %14 = icmp ugt i64 %13, 0
  br i1 %14, label %15, label %22

15:                                               ; preds = %12
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = load ptr, ptr %10, align 8, !tbaa !9
  %18 = load i64, ptr %7, align 8, !tbaa !11
  %19 = load i64, ptr %8, align 8, !tbaa !11
  %20 = call i64 @pread(i32 noundef %16, ptr noundef %17, i64 noundef %18, i64 noundef %19)
  store i64 %20, ptr %9, align 8, !tbaa !11
  %21 = icmp sgt i64 %20, 0
  br label %22

22:                                               ; preds = %15, %12
  %23 = phi i1 [ false, %12 ], [ %21, %15 ]
  br i1 %23, label %24, label %34

24:                                               ; preds = %22
  %25 = load i64, ptr %9, align 8, !tbaa !11
  %26 = load i64, ptr %8, align 8, !tbaa !11
  %27 = add nsw i64 %26, %25
  store i64 %27, ptr %8, align 8, !tbaa !11
  %28 = load i64, ptr %9, align 8, !tbaa !11
  %29 = load ptr, ptr %10, align 8, !tbaa !9
  %30 = getelementptr inbounds i8, ptr %29, i64 %28
  store ptr %30, ptr %10, align 8, !tbaa !9
  %31 = load i64, ptr %9, align 8, !tbaa !11
  %32 = load i64, ptr %7, align 8, !tbaa !11
  %33 = sub i64 %32, %31
  store i64 %33, ptr %7, align 8, !tbaa !11
  br label %12, !llvm.loop !13

34:                                               ; preds = %22
  %35 = load i64, ptr %9, align 8, !tbaa !11
  %36 = icmp eq i64 %35, 0
  br i1 %36, label %37, label %38

37:                                               ; preds = %34
  br label %40

38:                                               ; preds = %34
  %39 = load i64, ptr %7, align 8, !tbaa !11
  br label %40

40:                                               ; preds = %38, %37
  %41 = phi i64 [ -1, %37 ], [ %39, %38 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  ret i64 %41
}

declare i64 @pread(i32 noundef, ptr noundef, i64 noundef, i64 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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_pread(i32 noundef %0, ptr nocapture noundef %1, i64 noundef %2, i64 noundef %3) local_unnamed_addr #0 {
  %.not18 = icmp eq i64 %2, 0
  br i1 %.not18, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %4, %7
  %.021 = phi ptr [ %9, %7 ], [ %1, %4 ]
  %.01420 = phi i64 [ %8, %7 ], [ %3, %4 ]
  %.01519 = phi i64 [ %10, %7 ], [ %2, %4 ]
  %5 = tail call i64 @pread(i32 noundef %0, ptr noundef %.021, i64 noundef %.01519, i64 noundef %.01420) #2
  %6 = icmp sgt i64 %5, 0
  br i1 %6, label %7, label %.critedge.loopexit

7:                                                ; preds = %.lr.ph
  %8 = add nsw i64 %5, %.01420
  %9 = getelementptr inbounds i8, ptr %.021, i64 %5
  %10 = sub i64 %.01519, %5
  %.not = icmp eq i64 %10, 0
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !5

.critedge.loopexit:                               ; preds = %.lr.ph
  %11 = icmp eq i64 %5, 0
  %spec.select = select i1 %11, i64 -1, i64 %.01519
  br label %.critedge

.critedge:                                        ; preds = %7, %.critedge.loopexit, %4
  %.1 = phi i64 [ 0, %4 ], [ %spec.select, %.critedge.loopexit ], [ 0, %7 ]
  ret i64 %.1
}

; Function Attrs: nofree
declare noundef i64 @pread(i32 noundef, ptr nocapture noundef, i64 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,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass