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A64: Implement REV, REV32, and REV16 (#126)

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Thomas Guillemard 2018-01-21 13:17:47 +01:00 • committed by MerryMage
parent 5eb0bdecdf
commit 896cf44f96
5 changed files with 125 additions and 4 deletions
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64
src/frontend/A64/translate/impl/data_processing_register.cpp Normal file
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/* This file is part of the dynarmic project.
* Copyright (c) 2018 MerryMage
* This software may be used and distributed according to the terms of the GNU
* General Public License version 2 or any later version.
*/
#include "frontend/A64/translate/impl/impl.h"
namespace Dynarmic {
namespace A64 {
bool TranslatorVisitor::REV(bool sf, bool opc_0, Reg Rn, Reg Rd)
{
if (!sf && opc_0) return UnallocatedEncoding();
size_t datasize = sf ? 64 : 32;
IR::U32U64 operand = X(datasize, Rn);
IR::U32U64 result;
if (sf) {
result = ir.ByteReverseDual(operand);
} else {
result = ir.ByteReverseWord(operand);
}
X(datasize, Rd, result);
return true;
}
bool TranslatorVisitor::REV32_int(Reg Rn, Reg Rd)
{
IR::U64 operand = ir.GetX(Rn);
IR::U32 lo = ir.ByteReverseWord(ir.LeastSignificantWord(operand));
IR::U32 hi = ir.ByteReverseWord(ir.MostSignificantWord(operand).result);
IR::U64 result = ir.Pack2x32To1x64(lo, hi);
X(64, Rd, result);
return true;
}
bool TranslatorVisitor::REV16_int(bool sf, Reg Rn, Reg Rd)
{
size_t datasize = sf ? 64 : 32;
IR::U32U64 operand = X(datasize, Rn);
IR::U32U64 result;
IR::U32U64 hihalf;
IR::U32U64 lohalf;
if (sf) {
hihalf = ir.And(ir.LogicalShiftRight(IR::U64(operand), ir.Imm8(8)), ir.Imm64(0x00FF00FF00FF00FF));
lohalf = ir.And(ir.LogicalShiftLeft(IR::U64(operand), ir.Imm8(8)), ir.Imm64(0xFF00FF00FF00FF00));
} else {
hihalf = ir.And(ir.LogicalShiftRight(operand, ir.Imm8(8), ir.Imm1(0)).result, ir.Imm32(0x00FF00FF));
lohalf = ir.And(ir.LogicalShiftLeft(operand, ir.Imm8(8), ir.Imm1(0)).result, ir.Imm32(0xFF00FF00));
}
result = ir.Or(hihalf, lohalf);
X(datasize, Rd, result);
return true;
}
} // namespace A64
} // namespace Dynarmic