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extension: Implement SXTAB16 and SXTB16

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This commit is contained in:
MerryMage 2017-02-18 20:13:35 +00:00
parent c7f32f9466
commit 7fa5845c1f
1 changed files with 25 additions and 4 deletions
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29
src/frontend/translate/translate_arm/extension.cpp
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@ -29,8 +29,19 @@ bool ArmTranslatorVisitor::arm_SXTAB(Cond cond, Reg n, Reg d, SignExtendRotation
}
bool ArmTranslatorVisitor::arm_SXTAB16(Cond cond, Reg n, Reg d, SignExtendRotation rotate, Reg m) {
UNUSED(cond, n, d, rotate, m);
return InterpretThisInstruction();
if (d == Reg::PC || m == Reg::PC)
return UnpredictableInstruction();
// SXTAB16 <Rd>, <Rn>, <Rm>, <rotate>
if (ConditionPassed(cond)) {
auto rotated = Rotate(ir, m, rotate);
auto low_byte = ir.And(rotated, ir.Imm32(0x00FF00FF));
auto sign_bit = ir.And(rotated, ir.Imm32(0x00800080));
auto addend = ir.Or(low_byte, ir.Mul(sign_bit, ir.Imm32(0x1FE)));
auto result = ir.PackedAddU16(addend, ir.GetRegister(n)).result;
ir.SetRegister(d, result);
}
return true;
}
bool ArmTranslatorVisitor::arm_SXTAH(Cond cond, Reg n, Reg d, SignExtendRotation rotate, Reg m) {
@ -61,8 +72,18 @@ bool ArmTranslatorVisitor::arm_SXTB(Cond cond, Reg d, SignExtendRotation rotate,
}
bool ArmTranslatorVisitor::arm_SXTB16(Cond cond, Reg d, SignExtendRotation rotate, Reg m) {
UNUSED(cond, d, rotate, m);
return InterpretThisInstruction();
if (d == Reg::PC || m == Reg::PC)
return UnpredictableInstruction();
// SXTB16 <Rd>, <Rm>, <rotate>
if (ConditionPassed(cond)) {
auto rotated = Rotate(ir, m, rotate);
auto low_byte = ir.And(rotated, ir.Imm32(0x00FF00FF));
auto sign_bit = ir.And(rotated, ir.Imm32(0x00800080));
auto result = ir.Or(low_byte, ir.Mul(sign_bit, ir.Imm32(0x1FE)));
ir.SetRegister(d, result);
}
return true;
}
bool ArmTranslatorVisitor::arm_SXTH(Cond cond, Reg d, SignExtendRotation rotate, Reg m) {