; LLVM IR from achilles288/robot-monitor-graphics :: src/base/util/string.ll (ZN3rmg6String6resizeEv)

; 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.rmg::String" = type <{ ptr, i16, i16, [4 x i8] }>

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

; Function Attrs: nounwind
declare void @free(ptr noundef) #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN3rmg6String6resizeEv(ptr noundef nonnull align 8 dereferenceable(12) %0) #4 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8
  %5 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 1
  %6 = load i16, ptr %5, align 8, !tbaa !9
  %7 = zext i16 %6 to i32
  %8 = add nsw i32 %7, 2
  %9 = trunc i32 %8 to i16
  %10 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 2
  store i16 %9, ptr %10, align 2, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #5
  %11 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 2
  %12 = load i16, ptr %11, align 2, !tbaa !12
  %13 = zext i16 %12 to i32
  %14 = add nsw i32 %13, 1
  %15 = sext i32 %14 to i64
  %16 = call noalias ptr @malloc(i64 noundef %15) #6
  store ptr %16, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8, !tbaa !13
  %19 = icmp ne ptr %18, null
  br i1 %19, label %20, label %29

20:                                               ; preds = %1
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 0
  %23 = load ptr, ptr %22, align 8, !tbaa !13
  %24 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 1
  %25 = load i16, ptr %24, align 8, !tbaa !9
  %26 = zext i16 %25 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %21, ptr align 1 %23, i64 %26, i1 false)
  %27 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 0
  %28 = load ptr, ptr %27, align 8, !tbaa !13
  call void @free(ptr noundef %28) #5
  br label %29

29:                                               ; preds = %20, %1
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 0
  store ptr %30, ptr %31, align 8, !tbaa !13
  %32 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 0
  %33 = load ptr, ptr %32, align 8, !tbaa !13
  %34 = getelementptr inbounds %"class.rmg::String", ptr %4, i32 0, i32 1
  %35 = load i16, ptr %34, align 8, !tbaa !9
  %36 = zext i16 %35 to i64
  %37 = getelementptr inbounds i8, ptr %33, i64 %36
  store i8 0, ptr %37, align 1, !tbaa !14
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #5
  ret void
}

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 = { 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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 #5 = { nounwind }
attributes #6 = { 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, !11, i64 8}
!10 = !{!"_ZTSN3rmg6StringE", !6, i64 0, !11, i64 8, !11, i64 10}
!11 = !{!"short", !7, i64 0}
!12 = !{!10, !11, i64 10}
!13 = !{!10, !6, i64 0}
!14 = !{!7, !7, i64 0}


; 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 allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: mustprogress nounwind willreturn uwtable
define dso_local void @_ZN3rmg6String6resizeEv(ptr nocapture noundef nonnull align 8 dereferenceable(12) %0) local_unnamed_addr #3 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load i16, ptr %2, align 8, !tbaa !5
  %4 = add i16 %3, 2
  %5 = getelementptr inbounds i8, ptr %0, i64 10
  store i16 %4, ptr %5, align 2, !tbaa !11
  %6 = zext i16 %4 to i64
  %7 = add nuw nsw i64 %6, 1
  %8 = tail call noalias ptr @malloc(i64 noundef %7) #4
  %9 = load ptr, ptr %0, align 8, !tbaa !12
  %.not = icmp eq ptr %9, null
  br i1 %.not, label %12, label %10

10:                                               ; preds = %1
  %11 = zext i16 %3 to i64
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %8, ptr nonnull align 1 %9, i64 %11, i1 false)
  tail call void @free(ptr noundef nonnull %9) #5
  %.pre = load i16, ptr %2, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %10, %1
  %13 = phi i16 [ %.pre, %10 ], [ %3, %1 ]
  store ptr %8, ptr %0, align 8, !tbaa !12
  %14 = zext i16 %13 to i64
  %15 = getelementptr inbounds i8, ptr %8, i64 %14
  store i8 0, ptr %15, align 1, !tbaa !13
  ret void
}

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 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 #2 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #4 = { nounwind allocsize(0) }
attributes #5 = { 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, !10, i64 8}
!6 = !{!"_ZTSN3rmg6StringE", !7, i64 0, !10, i64 8, !10, i64 10}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"short", !8, i64 0}
!11 = !{!6, !10, i64 10}
!12 = !{!6, !7, i64 0}
!13 = !{!8, !8, i64 0}


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