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Implemented the PKHTB and PKHBT instructions with tests. (#40)

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Sebastian Valle 2016-11-23 16:45:18 -05:00 • committed by Merry
parent 780ff8e00e
commit 32615d0eff
4 changed files with 65 additions and 3 deletions
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41
src/frontend/translate/translate_arm/packing.cpp Normal file
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@ -0,0 +1,41 @@
/* This file is part of the dynarmic project.
* Copyright (c) 2016 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 "translate_arm.h"
namespace Dynarmic {
namespace Arm {
bool ArmTranslatorVisitor::arm_PKHBT(Cond cond, Reg n, Reg d, Imm5 imm5, Reg m) {
if (n == Reg::PC || d == Reg::PC || m == Reg::PC)
return UnpredictableInstruction();
if (ConditionPassed(cond)) {
auto shifted = EmitImmShift(ir.GetRegister(m), ShiftType::LSL, imm5, ir.Imm1(false)).result;
auto lower_half = ir.And(ir.GetRegister(n), ir.Imm32(0x0000FFFF));
auto upper_half = ir.And(shifted, ir.Imm32(0xFFFF0000));
ir.SetRegister(d, ir.Or(lower_half, upper_half));
}
return true;
}
bool ArmTranslatorVisitor::arm_PKHTB(Cond cond, Reg n, Reg d, Imm5 imm5, Reg m) {
if (n == Reg::PC || d == Reg::PC || m == Reg::PC)
return UnpredictableInstruction();
if (ConditionPassed(cond)) {
auto shifted = EmitImmShift(ir.GetRegister(m), ShiftType::ASR, imm5, ir.Imm1(false)).result;
auto lower_half = ir.And(shifted, ir.Imm32(0x0000FFFF));
auto upper_half = ir.And(ir.GetRegister(n), ir.Imm32(0xFFFF0000));
ir.SetRegister(d, ir.Or(lower_half, upper_half));
}
return true;
}
} // namespace Arm
} // namespace Dynarmic

4
src/frontend/translate/translate_arm/translate_arm.h
View file

@ -218,8 +218,8 @@ struct ArmTranslatorVisitor final {
bool arm_USADA8(Cond cond, Reg d, Reg a, Reg m, Reg n) { return InterpretThisInstruction(); }
// Packing instructions
bool arm_PKHBT(Cond cond, Reg n, Reg d, Imm5 imm5, Reg m) { return InterpretThisInstruction(); }
bool arm_PKHTB(Cond cond, Reg n, Reg d, Imm5 imm5, Reg m) { return InterpretThisInstruction(); }
bool arm_PKHBT(Cond cond, Reg n, Reg d, Imm5 imm5, Reg m);
bool arm_PKHTB(Cond cond, Reg n, Reg d, Imm5 imm5, Reg m);
// Reversal instructions
bool arm_REV(Cond cond, Reg d, Reg m);