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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using ILCompiler;
using Internal.TypeSystem;
namespace Internal.JitInterface
{
internal static class LoongArch64PassStructInRegister
{
public static uint GetLoongArch64PassStructInRegisterFlags(TypeDesc typeDesc)
{
FieldDesc firstField = null;
uint floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
int numIntroducedFields = 0;
foreach (FieldDesc field in typeDesc.GetFields())
{
if (!field.IsStatic)
{
if (firstField == null)
{
firstField = field;
}
numIntroducedFields++;
}
}
if ((numIntroducedFields == 0) || (numIntroducedFields > 2) || (typeDesc.GetElementSize().AsInt > 16))
{
return (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
//// The SIMD Intrinsic types are meant to be handled specially and should not be passed as struct registers
if (typeDesc.IsIntrinsic)
{
throw new NotImplementedException("For LoongArch64, SIMD would be implemented later");
}
MetadataType mdType = typeDesc as MetadataType;
Debug.Assert(mdType != null);
TypeDesc firstFieldElementType = firstField.FieldType;
int firstFieldSize = firstFieldElementType.GetElementSize().AsInt;
// A fixed buffer type is always a value type that has exactly one value type field at offset 0
// and who's size is an exact multiple of the size of the field.
// It is possible that we catch a false positive with this check, but that chance is extremely slim
// and the user can always change their structure to something more descriptive of what they want
// instead of adding additional padding at the end of a one-field structure.
// We do this check here to save looking up the FixedBufferAttribute when loading the field
// from metadata.
bool isFixedBuffer = numIntroducedFields == 1
&& firstFieldElementType.IsValueType
&& firstField.Offset.AsInt == 0
&& mdType.HasLayout()
&& ((typeDesc.GetElementSize().AsInt % firstFieldSize) == 0);
if (isFixedBuffer)
{
numIntroducedFields = typeDesc.GetElementSize().AsInt / firstFieldSize;
if (numIntroducedFields > 2)
{
return (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
}
int fieldIndex = 0;
foreach (FieldDesc field in typeDesc.GetFields())
{
if (fieldIndex > 1)
{
return (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
else if (field.IsStatic)
{
continue;
}
Debug.Assert(fieldIndex < numIntroducedFields);
switch (field.FieldType.Category)
{
case TypeFlags.Double:
{
if (numIntroducedFields == 1)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_ONLY_ONE;
}
else if (fieldIndex == 0)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_FIRST_FIELD_DOUBLE;
}
else if ((floatFieldFlags & (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST) != 0)
{
floatFieldFlags = floatFieldFlags ^ (uint)StructFloatFieldInfoFlags.STRUCT_MERGE_FIRST_SECOND_8;
}
else
{
floatFieldFlags |= (uint)StructFloatFieldInfoFlags.STRUCT_SECOND_FIELD_DOUBLE;
}
}
break;
case TypeFlags.Single:
{
if (numIntroducedFields == 1)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_ONLY_ONE;
}
else if (fieldIndex == 0)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST;
}
else if ((floatFieldFlags & (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST) != 0)
{
floatFieldFlags ^= (uint)StructFloatFieldInfoFlags.STRUCT_MERGE_FIRST_SECOND;
}
else
{
floatFieldFlags |= (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_SECOND;
}
}
break;
case TypeFlags.ValueType:
//case TypeFlags.Class:
//case TypeFlags.Array:
//case TypeFlags.SzArray:
{
uint floatFieldFlags2 = GetLoongArch64PassStructInRegisterFlags(field.FieldType);
if (numIntroducedFields == 1)
{
floatFieldFlags = floatFieldFlags2;
}
else if (field.FieldType.GetElementSize().AsInt > 8)
{
return (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
else if (fieldIndex == 0)
{
if ((floatFieldFlags2 & (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_ONLY_ONE) != 0)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST;
}
if (field.FieldType.GetElementSize().AsInt == 8)
{
floatFieldFlags |= (uint)StructFloatFieldInfoFlags.STRUCT_FIRST_FIELD_SIZE_IS8;
}
}
else
{
Debug.Assert(fieldIndex == 1);
if ((floatFieldFlags2 & (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_ONLY_ONE) != 0)
{
floatFieldFlags |= (uint)StructFloatFieldInfoFlags.STRUCT_MERGE_FIRST_SECOND;
}
if (field.FieldType.GetElementSize().AsInt == 8)
{
floatFieldFlags |= (uint)StructFloatFieldInfoFlags.STRUCT_SECOND_FIELD_SIZE_IS8;
}
floatFieldFlags2 = floatFieldFlags & ((uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST | (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_SECOND);
if (floatFieldFlags2 == 0)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
else if (floatFieldFlags2 == ((uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST | (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_SECOND))
{
floatFieldFlags ^= ((uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_ONLY_TWO | (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST | (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_SECOND);
}
}
}
break;
default:
{
if (field.FieldType.GetElementSize().AsInt == 8)
{
if (numIntroducedFields > 1)
{
if (fieldIndex == 0)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_FIRST_FIELD_SIZE_IS8;
}
else if ((floatFieldFlags & (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST) != 0)
{
floatFieldFlags |= (uint)StructFloatFieldInfoFlags.STRUCT_SECOND_FIELD_SIZE_IS8;
}
else
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
}
}
else if (fieldIndex == 1)
{
floatFieldFlags = (floatFieldFlags & (uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_FIRST) > 0 ? floatFieldFlags : (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
break;
}
}
fieldIndex++;
}
return floatFieldFlags;
}
}
}
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