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MOV(B) to 0177776 should not set the flags

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folkert van heusden 2022-06-02 21:42:55 +02:00
parent 2268d7c9f7
commit 5a77604127
1 changed files with 14 additions and 5 deletions
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19
cpu.cpp
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@ -431,18 +431,27 @@ bool cpu::double_operand_instructions(const uint16_t instr)
switch(operation) {
case 0b001: { // MOV/MOVB Move Word/Byte
bool set_flags = true;
addToMMR1(src_mode, src_reg, word_mode);
if (word_mode && dst_mode == 0)
setRegister(dst_reg, false, int8_t(src_value)); // int8_t: sign extension
else
putGAM(dst_mode, dst_reg, word_mode, src_value, false);
else {
uint16_t addr = getGAMAddress(dst_mode, dst_reg, word_mode, false);
set_flags = addr != 0177776;
b->write(addr, word_mode, src_value, false);
}
addToMMR1(dst_mode, dst_reg, word_mode);
setPSW_n(SIGN(src_value, word_mode));
setPSW_z(IS_0(src_value, word_mode));
setPSW_v(false);
if (set_flags) {
setPSW_n(SIGN(src_value, word_mode));
setPSW_z(IS_0(src_value, word_mode));
setPSW_v(false);
}
return true;
}