; LLVM IR from newbiediver/rioring :: src/io_buffer.ll (ZN7rioring9io_buffer6assignEm)

; 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"

%"class.rioring::io_buffer" = type { %"class.rioring::buffer_base", ptr, i64, i64, i64 }
%"class.rioring::buffer_base" = type { ptr }

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN7rioring9io_buffer6assignEm(ptr noundef nonnull align 8 dereferenceable(40) %0, i64 noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  %5 = load ptr, ptr %3, align 8
  %6 = getelementptr inbounds %"class.rioring::io_buffer", ptr %5, i32 0, i32 1
  %7 = load ptr, ptr %6, align 8, !tbaa !11
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %12

9:                                                ; preds = %2
  %10 = getelementptr inbounds %"class.rioring::io_buffer", ptr %5, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  call void @free(ptr noundef %11) #3
  br label %12

12:                                               ; preds = %9, %2
  %13 = load i64, ptr %4, align 8, !tbaa !9
  %14 = call noalias ptr @malloc(i64 noundef %13) #4
  %15 = getelementptr inbounds %"class.rioring::io_buffer", ptr %5, i32 0, i32 1
  store ptr %14, ptr %15, align 8, !tbaa !11
  %16 = load i64, ptr %4, align 8, !tbaa !9
  %17 = getelementptr inbounds %"class.rioring::io_buffer", ptr %5, i32 0, i32 3
  store i64 %16, ptr %17, align 8, !tbaa !14
  %18 = getelementptr inbounds %"class.rioring::io_buffer", ptr %5, i32 0, i32 2
  store i64 %16, ptr %18, align 8, !tbaa !15
  %19 = getelementptr inbounds %"class.rioring::io_buffer", ptr %5, i32 0, i32 4
  store i64 0, ptr %19, align 8, !tbaa !16
  ret void
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

attributes #0 = { nounwind allocsize(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 = { 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 "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 }
attributes #4 = { nounwind allocsize(0) }

!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, !6, i64 8}
!12 = !{!"_ZTSN7rioring9io_bufferE", !13, i64 0, !6, i64 8, !10, i64 16, !10, i64 24, !10, i64 32}
!13 = !{!"_ZTSN7rioring11buffer_baseE"}
!14 = !{!12, !10, i64 24}
!15 = !{!12, !10, i64 16}
!16 = !{!12, !10, i64 32}


; 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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind willreturn uwtable
define dso_local void @_ZN7rioring9io_buffer6assignEm(ptr nocapture noundef nonnull align 8 dereferenceable(40) %0, i64 noundef %1) local_unnamed_addr #1 align 2 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not = icmp eq ptr %4, null
  br i1 %.not, label %6, label %5

5:                                                ; preds = %2
  tail call void @free(ptr noundef nonnull %4) #3
  br label %6

6:                                                ; preds = %5, %2
  %7 = tail call noalias ptr @malloc(i64 noundef %1) #4
  store ptr %7, ptr %3, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %0, i64 24
  store i64 %1, ptr %8, align 8, !tbaa !12
  %9 = getelementptr inbounds i8, ptr %0, i64 16
  store i64 %1, ptr %9, align 8, !tbaa !13
  %10 = getelementptr inbounds i8, ptr %0, i64 32
  store i64 0, ptr %10, align 8, !tbaa !14
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #2

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { mustprogress nounwind willreturn 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 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 }
attributes #4 = { nounwind allocsize(0) }

!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, !8, i64 8}
!6 = !{!"_ZTSN7rioring9io_bufferE", !7, i64 0, !8, i64 8, !11, i64 16, !11, i64 24, !11, i64 32}
!7 = !{!"_ZTSN7rioring11buffer_baseE"}
!8 = !{!"any pointer", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = !{!"long", !9, i64 0}
!12 = !{!6, !11, i64 24}
!13 = !{!6, !11, i64 16}
!14 = !{!6, !11, i64 32}


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