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COMB fix

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folkert van heusden 2024-03-28 23:31:28 +01:00
parent 9dd4e51ff4
commit 881494b9ae
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 19 additions and 7 deletions
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26
cpu.cpp
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@ -867,15 +867,27 @@ bool cpu::single_operand_instructions(const uint16_t instr)
}
case 0b000101001: { // COM/COMB
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t v = a.value.value();
bool set_flags = false;
uint16_t v = 0;
if (word_mode == wm_byte)
v ^= 0xff;
else
v ^= 0xffff;
if (word_mode == wm_byte && dst_mode == 0) {
v = getRegister(dst_reg) ^ 0xff;
set_flags = putGAM(a, v);
setRegister(dst_reg, v);
set_flags = true;
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
v = a.value.value();
if (word_mode == wm_byte)
v ^= 0xff;
else
v ^= 0xffff;
set_flags = putGAM(a, v);
}
if (set_flags) {
setPSW_flags_nzv(v, word_mode);