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Implement instructions 0x03C-0x053, add flag constants and fix execute dispatch

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This commit is contained in:
Diego De Gante Pérez
2026-04-06 12:33:43 -06:00
parent 4e1a601175
commit 429596af86
5 changed files with 244 additions and 22 deletions
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63
src/spider/runtime/instr/Instr_020-03F.cpp
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@@ -154,20 +154,75 @@ namespace spider {
// TODO: Implement JIF
}
/**
* 0x03C — Jump Relative.
* Adds a signed offset (Dst) to the instruction register.
*/
void CPU::JMR() {
// TODO: Implement JMR
fetchOperDst();
i64 offset;
switch (_size) {
case 0b00: offset = static_cast<i64>(_dst->_i8); break; // 1 byte
case 0b01: offset = static_cast<i64>(_dst->_i16); break; // 2 bytes
case 0b10: offset = static_cast<i64>(_dst->_i32); break; // 4 bytes
case 0b11: offset = _dst->_i64; break; // 8 bytes
}
RI = static_cast<u64>(static_cast<i64>(RI) + offset);
}
/**
* 0x03D — Jump Relative if Equal.
* Adds a signed offset (Dst) to RI only if the Equal flag (bit 10) is set.
*/
void CPU::JER() {
// TODO: Implement JER
fetchOperDst();
if (RF & CPU::FLAG_EQUAL) {
i64 offset;
switch (_size) {
case 0b00: offset = static_cast<i64>(_dst->_i8); break;
case 0b01: offset = static_cast<i64>(_dst->_i16); break;
case 0b10: offset = static_cast<i64>(_dst->_i32); break;
case 0b11: offset = _dst->_i64; break;
}
RI = static_cast<u64>(static_cast<i64>(RI) + offset);
}
}
/**
* 0x03E — Jump Relative if Not Equal.
* Adds a signed offset (Dst) to RI only if the Equal flag (bit 10) is cleared.
*/
void CPU::JNR() {
// TODO: Implement JNR
fetchOperDst();
if (!(RF & CPU::FLAG_EQUAL)) {
i64 offset;
switch (_size) {
case 0b00: offset = static_cast<i64>(_dst->_i8); break;
case 0b01: offset = static_cast<i64>(_dst->_i16); break;
case 0b10: offset = static_cast<i64>(_dst->_i32); break;
case 0b11: offset = _dst->_i64; break;
}
RI = static_cast<u64>(static_cast<i64>(RI) + offset);
}
}
/**
* 0x03F — Jump Relative if Src is true.
* Adds a signed offset (Dst) to RI only if Src is booleanly true (non-zero).
*/
void CPU::JIR() {
// TODO: Implement JIR
fetchOperSrc();
fetchOperDst();
if (_src->_u64 != 0) {
i64 offset;
switch (_size) {
case 0b00: offset = static_cast<i64>(_dst->_i8); break;
case 0b01: offset = static_cast<i64>(_dst->_i16); break;
case 0b10: offset = static_cast<i64>(_dst->_i32); break;
case 0b11: offset = _dst->_i64; break;
}
RI = static_cast<u64>(static_cast<i64>(RI) + offset);
}
}
}