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Interpreter_FloatingPoint: Don't store to destination in frsqrte if VE or ZE is set and a relevant exception occurs

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As explained within commit a08ad82ace064f961b13369c96a0f3b48ca7ca5c, if
an invalid exception occurs and VE is set, then the destination register
should remain unchanged. Ditto for when ZE is set and a zero divide
exception occurs.
This commit is contained in:
Lioncash 2018-06-02 15:26:26 -04:00
parent 8d1b2f9cae
commit b71a9e658f
1 changed files with 10 additions and 7 deletions
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17
Source/Core/Core/PowerPC/Interpreter/Interpreter_FloatingPoint.cpp
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@ -422,36 +422,39 @@ void Interpreter::fresx(UGeckoInstruction inst)
void Interpreter::frsqrtex(UGeckoInstruction inst)
{
const double b = rPS0(inst.FB);
const double result = Common::ApproximateReciprocalSquareRoot(b);
const auto compute_result = [inst](double value) {
const double result = Common::ApproximateReciprocalSquareRoot(value);
rPS0(inst.FD) = result;
PowerPC::UpdateFPRF(result);
};
if (b < 0.0)
{
SetFPException(FPSCR_VXSQRT);
if (FPSCR.VE == 0)
PowerPC::UpdateFPRF(result);
compute_result(b);
}
else if (b == 0.0)
{
SetFPException(FPSCR_ZX);
if (FPSCR.ZE == 0)
PowerPC::UpdateFPRF(result);
compute_result(b);
}
else if (Common::IsSNAN(b))
{
SetFPException(FPSCR_VXSNAN);
if (FPSCR.VE == 0)
PowerPC::UpdateFPRF(result);
compute_result(b);
}
else
{
PowerPC::UpdateFPRF(result);
compute_result(b);
}
rPS0(inst.FD) = result;
if (inst.Rc)
Helper_UpdateCR1();
}