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optimize WriteFixed32 and WriteFixed64

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This commit is contained in:
Jan Tattermusch 2020-06-23 16:46:01 +02:00
parent 17a4b181a0
commit 6afd469fe0
1 changed files with 26 additions and 14 deletions
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40
csharp/src/Google.Protobuf/WritingPrimitives.cs
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@ -340,12 +340,9 @@ namespace Google.Protobuf
public static void WriteRawLittleEndian32(ref Span<byte> buffer, ref WriterInternalState state, uint value)
{
const int length = sizeof(uint);
if (state.position + length > state.limit)
if (state.position + length > buffer.Length)
{
WriteRawByte(ref buffer, ref state, (byte)value);
WriteRawByte(ref buffer, ref state, (byte)(value >> 8));
WriteRawByte(ref buffer, ref state, (byte)(value >> 16));
WriteRawByte(ref buffer, ref state, (byte)(value >> 24));
WriteRawLittleEndian32SlowPath(ref buffer, ref state, value);
}
else
{
@ -354,19 +351,21 @@ namespace Google.Protobuf
}
}
[MethodImpl(MethodImplOptions.NoInlining)]
private static void WriteRawLittleEndian32SlowPath(ref Span<byte> buffer, ref WriterInternalState state, uint value)
{
WriteRawByte(ref buffer, ref state, (byte)value);
WriteRawByte(ref buffer, ref state, (byte)(value >> 8));
WriteRawByte(ref buffer, ref state, (byte)(value >> 16));
WriteRawByte(ref buffer, ref state, (byte)(value >> 24));
}
public static void WriteRawLittleEndian64(ref Span<byte> buffer, ref WriterInternalState state, ulong value)
{
const int length = sizeof(ulong);
if (state.position + length > state.limit)
if (state.position + length > buffer.Length)
{
WriteRawByte(ref buffer, ref state, (byte)value);
WriteRawByte(ref buffer, ref state, (byte)(value >> 8));
WriteRawByte(ref buffer, ref state, (byte)(value >> 16));
WriteRawByte(ref buffer, ref state, (byte)(value >> 24));
WriteRawByte(ref buffer, ref state, (byte)(value >> 32));
WriteRawByte(ref buffer, ref state, (byte)(value >> 40));
WriteRawByte(ref buffer, ref state, (byte)(value >> 48));
WriteRawByte(ref buffer, ref state, (byte)(value >> 56));
WriteRawLittleEndian64SlowPath(ref buffer, ref state, value);
}
else
{
@ -385,6 +384,19 @@ namespace Google.Protobuf
}
}
[MethodImpl(MethodImplOptions.NoInlining)]
public static void WriteRawLittleEndian64SlowPath(ref Span<byte> buffer, ref WriterInternalState state, ulong value)
{
WriteRawByte(ref buffer, ref state, (byte)value);
WriteRawByte(ref buffer, ref state, (byte)(value >> 8));
WriteRawByte(ref buffer, ref state, (byte)(value >> 16));
WriteRawByte(ref buffer, ref state, (byte)(value >> 24));
WriteRawByte(ref buffer, ref state, (byte)(value >> 32));
WriteRawByte(ref buffer, ref state, (byte)(value >> 40));
WriteRawByte(ref buffer, ref state, (byte)(value >> 48));
WriteRawByte(ref buffer, ref state, (byte)(value >> 56));
}
public static void WriteRawByte(ref Span<byte> buffer, ref WriterInternalState state, byte value)
{
if (state.position == state.limit)