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common/fp/unpacked: Handle half-precision unpacking in FPUnpackBase

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Lioncash 2019-03-09 01:18:43 -05:00 committed by MerryMage
parent 8f9fe8690a
commit 7e814de445
1 changed files with 10 additions and 1 deletions
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11
src/common/fp/unpacked.cpp
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@ -23,11 +23,17 @@ std::tuple<FPType, bool, FPUnpacked> FPUnpackBase(FPT op, FPCR fpcr, FPSR& fpsr)
constexpr size_t mantissa_low_bit = 0;
constexpr int denormal_exponent = FPInfo<FPT>::exponent_min - int(FPInfo<FPT>::explicit_mantissa_width);
constexpr bool is_half_precision = std::is_same_v<FPT, u16>;
const bool sign = Common::Bit<sign_bit>(op);
const FPT exp_raw = Common::Bits<exponent_low_bit, exponent_high_bit>(op);
const FPT frac_raw = Common::Bits<mantissa_low_bit, mantissa_high_bit>(op);
if (exp_raw == 0) {
if constexpr (is_half_precision) {
if (frac_raw == 0 || fpcr.FZ16()) {
return {FPType::Zero, sign, {sign, 0, 0}};
}
}
if (frac_raw == 0 || fpcr.FZ()) {
if (frac_raw != 0) {
FPProcessException(FPExc::InputDenorm, fpcr, fpsr);
@ -38,7 +44,9 @@ std::tuple<FPType, bool, FPUnpacked> FPUnpackBase(FPT op, FPCR fpcr, FPSR& fpsr)
return {FPType::Nonzero, sign, ToNormalized(sign, denormal_exponent, frac_raw)};
}
if (exp_raw == Common::Ones<FPT>(FPInfo<FPT>::exponent_width)) {
const bool exp_all_ones = exp_raw == Common::Ones<FPT>(FPInfo<FPT>::exponent_width);
const bool ahp_disabled = is_half_precision && !fpcr.AHP();
if (exp_all_ones || ahp_disabled) {
if (frac_raw == 0) {
return {FPType::Infinity, sign, ToNormalized(sign, 1000000, 1)};
}
@ -52,6 +60,7 @@ std::tuple<FPType, bool, FPUnpacked> FPUnpackBase(FPT op, FPCR fpcr, FPSR& fpsr)
return {FPType::Nonzero, sign, {sign, exp, frac}};
}
template std::tuple<FPType, bool, FPUnpacked> FPUnpackBase<u16>(u16 op, FPCR fpcr, FPSR& fpsr);
template std::tuple<FPType, bool, FPUnpacked> FPUnpackBase<u32>(u32 op, FPCR fpcr, FPSR& fpsr);
template std::tuple<FPType, bool, FPUnpacked> FPUnpackBase<u64>(u64 op, FPCR fpcr, FPSR& fpsr);