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Support 286-style DAS.

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321 failures to go.
This commit is contained in:
Thomas Harte
2025-08-07 19:49:41 -04:00
parent b15a865c88
commit a0c50f0521
2 changed files with 13 additions and 5 deletions
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15
InstructionSets/x86/Implementation/BCD.hpp
View File

@@ -104,18 +104,27 @@ void daas(
ContextT &context
) {
bool top_exceeded_threshold;
if constexpr (ContextT::model == Model::i8086) {
constexpr bool is_8086 = ContextT::model == Model::i8086;
if constexpr (is_8086) {
top_exceeded_threshold = al > (context.flags.template flag<Flag::AuxiliaryCarry>() ? 0x9f : 0x99);
} else {
top_exceeded_threshold = al > 0x99;
}
const auto initial_cf = context.flags.template flag<Flag::Carry>();
if((al & 0x0f) > 0x09 || context.flags.template flag<Flag::AuxiliaryCarry>()) {
if constexpr (add) al += 0x06; else al -= 0x06;
const auto prior_al = al;
if constexpr (add) {
al += 0x06;
if(!is_8086 && al < prior_al) context.flags.template set_from<Flag::Carry>(1);
} else {
al -= 0x06;
if(!is_8086 && al > prior_al) context.flags.template set_from<Flag::Carry>(1);
}
context.flags.template set_from<Flag::AuxiliaryCarry>(1);
}
if(top_exceeded_threshold || context.flags.template flag<Flag::Carry>()) {
if(top_exceeded_threshold || initial_cf) {
if constexpr (add) al += 0x60; else al -= 0x60;
context.flags.template set_from<Flag::Carry>(1);
}

3
OSBindings/Mac/Clock SignalTests/8088Tests.mm
View File

@@ -38,7 +38,6 @@ NSSet *const allowList = [NSSet setWithArray:@[
// @"F7.7.json.gz", // IDIV word
// @"00.json.gz",
// @"2F.json.gz", // DAS
// @"61.json.gz", // POPA
// @"69.json.gz", // IMUL
// @"81.0.json.gz", // ADD
@@ -386,7 +385,7 @@ void apply_execution_test(
NSDictionary *metadata
) {
// NSLog(@"%@", test[@"hash"]);
if([test[@"hash"] isEqualToString:@"3744dfa0a1386ef97ddd25c67bad150ba05beb3b"]) {
if([test[@"hash"] isEqualToString:@"453ef52b02539ada0b78a7bdc319c4d7d06fc0a2"]) {
printf("");
}