mirror of
https://github.com/azahar-emu/dynarmic
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99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#include "frontend/A64/translate/impl/impl.h"
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namespace Dynarmic::A64 {
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static IR::U32U64 ReplicateBit(IREmitter& ir, const IR::U32U64& value, u8 bit_position_to_replicate) {
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u8 datasize = value.GetType() == IR::Type::U64 ? 64 : 32;
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auto bit = ir.LogicalShiftLeft(value, ir.Imm8(datasize - 1 - bit_position_to_replicate));
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return ir.ArithmeticShiftRight(bit, ir.Imm8(datasize - 1));
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}
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bool TranslatorVisitor::SBFM(bool sf, bool N, Imm<6> immr, Imm<6> imms, Reg Rn, Reg Rd) {
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size_t datasize = sf ? 64 : 32;
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if (sf && !N) return ReservedValue();
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if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) return ReservedValue();
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u8 R = immr.ZeroExtend<u8>();
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u8 S = imms.ZeroExtend<u8>();
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auto masks = DecodeBitMasks(N, imms, immr, false);
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if (!masks) return ReservedValue();
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auto src = X(datasize, Rn);
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auto bot = ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask));
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auto top = ReplicateBit(ir, src, S);
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top = ir.And(top, I(datasize, ~masks->tmask));
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bot = ir.And(bot, I(datasize, masks->tmask));
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X(datasize, Rd, ir.Or(top, bot));
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return true;
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}
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bool TranslatorVisitor::BFM(bool sf, bool N, Imm<6> immr, Imm<6> imms, Reg Rn, Reg Rd) {
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size_t datasize = sf ? 64 : 32;
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if (sf && !N) return ReservedValue();
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if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) return ReservedValue();
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u8 R = immr.ZeroExtend<u8>();
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auto masks = DecodeBitMasks(N, imms, immr, false);
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if (!masks) return ReservedValue();
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auto dst = X(datasize, Rd);
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auto src = X(datasize, Rn);
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auto bot = ir.Or(ir.And(dst, I(datasize, ~masks->wmask)), ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask)));
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X(datasize, Rd, ir.Or(ir.And(dst, I(datasize, ~masks->tmask)), ir.And(bot, I(datasize, masks->tmask))));
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return true;
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}
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bool TranslatorVisitor::UBFM(bool sf, bool N, Imm<6> immr, Imm<6> imms, Reg Rn, Reg Rd) {
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size_t datasize = sf ? 64 : 32;
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if (sf && !N) return ReservedValue();
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if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) return ReservedValue();
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u8 R = immr.ZeroExtend<u8>();
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auto masks = DecodeBitMasks(N, imms, immr, false);
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if (!masks) return ReservedValue();
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auto src = X(datasize, Rn);
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auto bot = ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask));
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X(datasize, Rd, ir.And(bot, I(datasize, masks->tmask)));
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return true;
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}
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bool TranslatorVisitor::EXTR(bool sf, bool N, Reg Rm, Imm<6> imms, Reg Rn, Reg Rd) {
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if (N != sf) {
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return UnallocatedEncoding();
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}
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if (!sf && imms.Bit<5>()) {
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return ReservedValue();
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}
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const size_t datasize = sf ? 64 : 32;
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const IR::U32U64 m = X(datasize, Rm);
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const IR::U32U64 n = X(datasize, Rn);
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const IR::U32U64 result = ir.ExtractRegister(m, n, ir.Imm8(imms.ZeroExtend<u8>()));
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X(datasize, Rd, result);
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return true;
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}
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} // namespace Dynarmic::A64
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