; LLVM IR from apache/brpc :: src/butil/third_party/snappy (snappy-sinksource)

; 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.butil::snappy::UncheckedByteArraySink" = type { %"class.butil::snappy::Sink", ptr }
%"class.butil::snappy::Sink" = type { ptr }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN5butil6snappy22UncheckedByteArraySink6AppendEPKcm(ptr noundef nonnull align 8 dereferenceable(16) %0, ptr noundef %1, i64 noundef %2) unnamed_addr #0 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = 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
  %7 = load ptr, ptr %4, align 8
  %8 = load ptr, ptr %5, align 8, !tbaa !5
  %9 = getelementptr inbounds %"class.butil::snappy::UncheckedByteArraySink", ptr %7, i32 0, i32 1
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  %11 = icmp ne ptr %8, %10
  br i1 %11, label %12, label %17

12:                                               ; preds = %3
  %13 = getelementptr inbounds %"class.butil::snappy::UncheckedByteArraySink", ptr %7, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !11
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load i64, ptr %6, align 8, !tbaa !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %14, ptr align 1 %15, i64 %16, i1 false)
  br label %17

17:                                               ; preds = %12, %3
  %18 = load i64, ptr %6, align 8, !tbaa !9
  %19 = getelementptr inbounds %"class.butil::snappy::UncheckedByteArraySink", ptr %7, i32 0, i32 1
  %20 = load ptr, ptr %19, align 8, !tbaa !11
  %21 = getelementptr inbounds i8, ptr %20, i64 %18
  store ptr %21, ptr %19, align 8, !tbaa !11
  ret void
}

; 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) #1

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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }

!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 = !{!"_ZTSN5butil6snappy22UncheckedByteArraySinkE", !13, i64 0, !6, i64 8}
!13 = !{!"_ZTSN5butil6snappy4SinkE"}


; 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 norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_ZN5butil6snappy22UncheckedByteArraySink6AppendEPKcm(ptr nocapture noundef nonnull align 8 dereferenceable(16) %0, ptr noundef readonly %1, i64 noundef %2) unnamed_addr #0 align 2 {
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %.not = icmp eq ptr %5, %1
  br i1 %.not, label %7, label %6

6:                                                ; preds = %3
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %5, ptr align 1 %1, i64 %2, i1 false)
  %.pre = load ptr, ptr %4, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %6, %3
  %8 = phi ptr [ %.pre, %6 ], [ %5, %3 ]
  %9 = getelementptr inbounds i8, ptr %8, i64 %2
  store ptr %9, ptr %4, align 8, !tbaa !5
  ret void
}

; 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) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) 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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }

!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 = !{!"_ZTSN5butil6snappy22UncheckedByteArraySinkE", !7, i64 0, !8, i64 8}
!7 = !{!"_ZTSN5butil6snappy4SinkE"}
!8 = !{!"any pointer", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}


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