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Copy pathRISCV64PassStructInRegister.cs
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RISCV64PassStructInRegister.cs
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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.Diagnostics;
using ILCompiler;
using Internal.TypeSystem;
namespace Internal.JitInterface
{
internal static class RISCV64PassStructInRegister
{
public static uint GetRISCV64PassStructInRegisterFlags(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)
{
firstField ??= field;
numIntroducedFields++;
}
}
if ((numIntroducedFields == 0) || (numIntroducedFields > 2) || (typeDesc.GetElementSize().AsInt > 16))
{
return (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
MetadataType mdType = typeDesc as MetadataType;
Debug.Assert(mdType != null);
TypeDesc firstFieldElementType = firstField.FieldType;
int firstFieldSize = firstFieldElementType.GetElementSize().AsInt;
bool hasImpliedRepeatedFields = mdType.HasImpliedRepeatedFields();
if (hasImpliedRepeatedFields)
{
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 ^= (uint)StructFloatFieldInfoFlags.STRUCT_MERGE_FIRST_SECOND_8;
}
else
{
floatFieldFlags |= (uint)StructFloatFieldInfoFlags.STRUCT_SECOND_FIELD_DOUBLE;
}
// Pass with two integer registers in `struct {int a, int b, float/double c}` cases
if (fieldIndex == 1 &&
(floatFieldFlags |
(uint)StructFloatFieldInfoFlags.STRUCT_FIRST_FIELD_SIZE_IS8 |
(uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_SECOND) ==
floatFieldFlags)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
}
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;
}
// Pass with two integer registers in `struct {int a, int b, float/double c}` cases
if (fieldIndex == 1 &&
(floatFieldFlags |
(uint)StructFloatFieldInfoFlags.STRUCT_FIRST_FIELD_SIZE_IS8 |
(uint)StructFloatFieldInfoFlags.STRUCT_FLOAT_FIELD_SECOND) ==
floatFieldFlags)
{
floatFieldFlags = (uint)StructFloatFieldInfoFlags.STRUCT_NO_FLOAT_FIELD;
}
}
break;
case TypeFlags.ValueType:
//case TypeFlags.Class:
//case TypeFlags.Array:
//case TypeFlags.SzArray:
{
uint floatFieldFlags2 = GetRISCV64PassStructInRegisterFlags(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;
}
}
}