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Implement RSB

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somehow missed this earlier
This commit is contained in:
Tillmann Karras 2016-08-05 02:13:26 +01:00
parent eb2e6e8bea
commit fce8c86c90
1 changed files with 58 additions and 3 deletions
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61
src/frontend/translate/translate_arm/data_processing.cpp
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@ -614,15 +614,70 @@ bool ArmTranslatorVisitor::arm_ORR_rsr(Cond cond, bool S, Reg n, Reg d, Reg s, S
}
bool ArmTranslatorVisitor::arm_RSB_imm(Cond cond, bool S, Reg n, Reg d, int rotate, Imm8 imm8) {
return InterpretThisInstruction();
if (ConditionPassed(cond)) {
u32 imm32 = ArmExpandImm(rotate, imm8);
auto result = ir.SubWithCarry(ir.Imm32(imm32), ir.GetRegister(n), ir.Imm1(1));
if (d == Reg::PC) {
ASSERT(!S);
ir.ALUWritePC(result.result);
ir.SetTerm(IR::Term::ReturnToDispatch{});
return false;
}
ir.SetRegister(d, result.result);
if (S) {
ir.SetNFlag(ir.MostSignificantBit(result.result));
ir.SetZFlag(ir.IsZero(result.result));
ir.SetCFlag(result.carry);
ir.SetVFlag(result.overflow);
}
}
return true;
}
bool ArmTranslatorVisitor::arm_RSB_reg(Cond cond, bool S, Reg n, Reg d, Imm5 imm5, ShiftType shift, Reg m) {
return InterpretThisInstruction();
if (ConditionPassed(cond)) {
auto shifted = EmitImmShift(ir.GetRegister(m), shift, imm5, ir.GetCFlag());
auto result = ir.SubWithCarry(shifted.result, ir.GetRegister(n), ir.Imm1(1));
if (d == Reg::PC) {
ASSERT(!S);
ir.ALUWritePC(result.result);
ir.SetTerm(IR::Term::ReturnToDispatch{});
return false;
}
ir.SetRegister(d, result.result);
if (S) {
ir.SetNFlag(ir.MostSignificantBit(result.result));
ir.SetZFlag(ir.IsZero(result.result));
ir.SetCFlag(result.carry);
ir.SetVFlag(result.overflow);
}
}
return true;
}
bool ArmTranslatorVisitor::arm_RSB_rsr(Cond cond, bool S, Reg n, Reg d, Reg s, ShiftType shift, Reg m) {
return InterpretThisInstruction();
if (n == Reg::PC || m == Reg::PC || s == Reg::PC)
return UnpredictableInstruction();
if (ConditionPassed(cond)) {
auto shift_n = ir.LeastSignificantByte(ir.GetRegister(s));
auto carry_in = ir.GetCFlag();
auto shifted = EmitRegShift(ir.GetRegister(m), shift, shift_n, carry_in);
auto result = ir.SubWithCarry(shifted.result, ir.GetRegister(n), ir.Imm1(1));
if (d == Reg::PC) {
ASSERT(!S);
ir.ALUWritePC(result.result);
ir.SetTerm(IR::Term::ReturnToDispatch{});
return false;
}
ir.SetRegister(d, result.result);
if (S) {
ir.SetNFlag(ir.MostSignificantBit(result.result));
ir.SetZFlag(ir.IsZero(result.result));
ir.SetCFlag(result.carry);
ir.SetVFlag(result.overflow);
}
}
return true;
}
bool ArmTranslatorVisitor::arm_RSC_imm(Cond cond, bool S, Reg n, Reg d, int rotate, Imm8 imm8) {