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stackalloc for BytesToDecimal #31190

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Jan 25, 2024
Merged

stackalloc for BytesToDecimal #31190

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21 changes: 10 additions & 11 deletions src/EFCore/Storage/ValueConversion/NumberToBytesConverter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -250,23 +250,22 @@ private static readonly MethodInfo ToDecimalMethod

private static decimal BytesToDecimal(byte[] bytes)
{
var gotBytes = bytes;
Span<byte> gotBytes = BitConverter.IsLittleEndian ? stackalloc byte[16] : bytes;
if (BitConverter.IsLittleEndian)
{
gotBytes = new byte[16];
Array.Copy(bytes, gotBytes, 16);
Array.Reverse(gotBytes, 0, 4);
Array.Reverse(gotBytes, 4, 4);
Array.Reverse(gotBytes, 8, 4);
Array.Reverse(gotBytes, 12, 4);
bytes.CopyTo(gotBytes);
gotBytes.Slice(0, 4).Reverse();
gotBytes.Slice(4, 4).Reverse();
gotBytes.Slice(8, 4).Reverse();
gotBytes.Slice(12, 4).Reverse();
}

var specialBits = BitConverter.ToUInt32(gotBytes, 0);
var specialBits = BitConverter.ToUInt32(gotBytes);

return new decimal(
BitConverter.ToInt32(gotBytes, 12),
BitConverter.ToInt32(gotBytes, 8),
BitConverter.ToInt32(gotBytes, 4),
BitConverter.ToInt32(gotBytes.Slice(12)),
BitConverter.ToInt32(gotBytes.Slice(8)),
BitConverter.ToInt32(gotBytes.Slice(4)),
(specialBits & 0x80000000) != 0,
(byte)((specialBits & 0x00FF0000) >> 16));
}
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