; LLVM IR from kmilo17pet/QuarkTS-cpp :: src/bytebuffer.ll (ZN3qOS10byteBuffer4readEPvm)

; 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: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZN3qOS10byteBuffer4readEPvm(ptr noundef nonnull align 8 dereferenceable(40) %0, ptr noundef %1, i64 noundef %2) #1 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i8, align 1
  %8 = alloca ptr, align 8
  %9 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  %10 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 1, ptr %7) #2
  store i8 0, ptr %7, align 1, !tbaa !11
  %11 = load i64, ptr %6, align 8, !tbaa !9
  %12 = icmp ugt i64 %11, 0
  br i1 %12, label %13, label %29

13:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %14, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  store i64 0, ptr %9, align 8, !tbaa !9
  br label %15

15:                                               ; preds = %25, %13
  %16 = load i64, ptr %9, align 8, !tbaa !9
  %17 = load i64, ptr %6, align 8, !tbaa !9
  %18 = icmp ult i64 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  br label %28

20:                                               ; preds = %15
  %21 = load ptr, ptr %8, align 8, !tbaa !5
  %22 = load i64, ptr %9, align 8, !tbaa !9
  %23 = getelementptr inbounds i8, ptr %21, i64 %22
  %24 = call noundef zeroext i1 @_ZN3qOS10byteBuffer3getEPh(ptr noundef nonnull align 8 dereferenceable(40) %10, ptr noundef %23) #2
  br label %25

25:                                               ; preds = %20
  %26 = load i64, ptr %9, align 8, !tbaa !9
  %27 = add i64 %26, 1
  store i64 %27, ptr %9, align 8, !tbaa !9
  br label %15, !llvm.loop !13

28:                                               ; preds = %19
  store i8 1, ptr %7, align 1, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %29

29:                                               ; preds = %28, %3
  %30 = load i8, ptr %7, align 1, !tbaa !11, !range !15, !noundef !16
  %31 = trunc i8 %30 to i1
  call void @llvm.lifetime.end.p0(i64 1, ptr %7) #2
  ret i1 %31
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN3qOS10byteBuffer3getEPh(ptr noundef nonnull align 8 dereferenceable(40), ptr noundef) #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = { 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 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{i8 0, i8 2}
!16 = !{}


; 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: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZN3qOS10byteBuffer4readEPvm(ptr noundef nonnull align 8 dereferenceable(40) %0, ptr noundef %1, i64 noundef %2) local_unnamed_addr #0 align 2 {
  %.not = icmp ne i64 %2, 0
  br i1 %.not, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %3, %.preheader
  %.010 = phi i64 [ %6, %.preheader ], [ 0, %3 ]
  %4 = getelementptr inbounds i8, ptr %1, i64 %.010
  %5 = tail call noundef zeroext i1 @_ZN3qOS10byteBuffer3getEPh(ptr noundef nonnull align 8 dereferenceable(40) %0, ptr noundef %4) #1
  %6 = add nuw i64 %.010, 1
  %exitcond.not = icmp eq i64 %6, %2
  br i1 %exitcond.not, label %.loopexit, label %.preheader, !llvm.loop !5

.loopexit:                                        ; preds = %.preheader, %3
  ret i1 %.not
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN3qOS10byteBuffer3getEPh(ptr noundef nonnull align 8 dereferenceable(40), ptr noundef) local_unnamed_addr #0 align 2

attributes #0 = { mustprogress 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 = { 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: GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass