[RISC-V][LoongArch64] JIT: pass structs according to floating-point calling convention properly #104237
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…carries also exact field sizes and offsets
… FpStruct info calculation
…omputeReturnFlags() This fixes JIT/HardwareIntrinsics/General/Vector* tests.
Co-authored-by: Qiao Pengcheng <qiaopengcheng@loongson.cn>
Co-authored-by: Qiao Pengcheng <qiaopengcheng@loongson.cn>
Co-authored-by: Qiao Pengcheng <qiaopengcheng@loongson.cn>
Co-authored-by: Qiao Pengcheng <qiaopengcheng@loongson.cn>
…they were write-only. Replace with offset from new ABI info
…tack slot over-allocation
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… because they were identical. Move it to Common\Internal/Runtime because it's no longer exposed in JIT interface.
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Small structs containing one or two fields, at least one of them floating-point, can be passed (or returned) according to hardware floating-point calling convention: each field occupying one register. The existing implementation worked only for the narrow case when the fields were naturally placed. However, the ABIs on both platforms when enregistering fields disregard placement hints such as manual alignment, packing attributes, or padding with empty structs (when they are sized 1 byte like in C++ or .NET). This means additional information such as field offsets and sizes needs to be passed wherever registers<->memory copying of such structs happens.
This change uses the new passing information information introduced in #103945 to implement passing such structs in JIT properly.
Stems from #101796, part of #84834, cc @dotnet/samsung