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folkert van heusden 2024-03-29 12:05:05 +01:00
parent a15d464532
commit bdadc393b2
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 8 additions and 19 deletions
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27
cpu.cpp
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@ -1185,21 +1185,15 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if (dst_mode == 0) { if (dst_mode == 0) {
uint16_t v = getRegister(dst_reg); uint16_t v = getRegister(dst_reg);
bool hb = word_mode == wm_byte ? v & 128 : v & 32768; uint16_t hb = word_mode == wm_byte ? v & 128 : v & 32768;
setPSW_c(v & 1); setPSW_c(v & 1);
if (word_mode == wm_byte) { if (word_mode == wm_byte)
uint16_t add = v & 0xff00;
v = (v & 255) >> 1; v = (v & 255) >> 1;
v |= hb << 7; else
v |= add;
}
else {
v >>= 1; v >>= 1;
v |= hb << 15; v |= hb;
}
setRegister(dst_reg, v); setRegister(dst_reg, v);
@ -1210,21 +1204,16 @@ bool cpu::single_operand_instructions(const uint16_t instr)
else { else {
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur); auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t v = a.value.value(); uint16_t v = a.value.value();
uint16_t add = word_mode == wm_byte ? v & 0xff00 : 0; // TODO is this right?
bool hb = word_mode == wm_byte ? v & 128 : v & 32768; uint16_t hb = word_mode == wm_byte ? v & 128 : v & 32768;
setPSW_c(v & 1); setPSW_c(v & 1);
if (word_mode == wm_byte) { if (word_mode == wm_byte)
v = (v & 255) >> 1; v = (v & 255) >> 1;
v |= hb << 7; else
v |= add;
}
else {
v >>= 1; v >>= 1;
v |= hb << 15; v |= hb;
}
b->write(a.addr.value(), a.word_mode, v, a.mode_selection, a.space); b->write(a.addr.value(), a.word_mode, v, a.mode_selection, a.space);