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Avoid expensive path for 8088; pull out allow list.

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This commit is contained in:
Thomas Harte
2025-08-06 15:21:54 -04:00
parent 01fbe2d3de
commit 0745c5128a
2 changed files with 72 additions and 68 deletions
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30
InstructionSets/x86/Implementation/Repetition.hpp
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@@ -130,20 +130,24 @@ void stos(
return;
}
try {
context.memory.template access<IntT, AccessType::Write>(Source::ES, eDI) = eAX;
} catch (const Exception &e) {
// Empirical quirk of at least the 286: DI is adjusted even if the following access throws,
// and CX has been adjusted... twice?
//
// (yes: including even if CX has already hit zero)
if constexpr (ContextT::model <= Model::i80286) {
eDI += context.flags.template direction<AddressT>() * sizeof(IntT);
repeat<AddressT, repetition>(eCX, context);
repeat<AddressT, repetition>(eCX, context);
}
if constexpr (uses_8086_exceptions(ContextT::model)) {
try {
context.memory.template access<IntT, AccessType::Write>(Source::ES, eDI) = eAX;
} catch (const Exception &e) {
// Empirical quirk of at least the 286: DI is adjusted even if the following access throws,
// and CX has been adjusted... twice?
//
// (yes: including even if CX has already hit zero)
if constexpr (ContextT::model <= Model::i80286) {
eDI += context.flags.template direction<AddressT>() * sizeof(IntT);
repeat<AddressT, repetition>(eCX, context);
repeat<AddressT, repetition>(eCX, context);
}
throw e;
throw e;
}
} else {
context.memory.template access<IntT, AccessType::Write>(Source::ES, eDI) = eAX;
}
eDI += context.flags.template direction<AddressT>() * sizeof(IntT);
repeat<AddressT, repetition>(eCX, context);