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mov mmr1 tweak

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folkert van heusden 2024-04-12 20:06:54 +02:00
parent 85e8f873e9
commit 92642c0e17
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 8 additions and 5 deletions
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13
cpu.cpp
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@ -494,13 +494,18 @@ bool cpu::double_operand_instructions(const uint16_t instr)
switch(operation) {
case 0b001: { // MOV/MOVB Move Word/Byte
gam_rc_t g_src = getGAM(src_mode, src_reg, word_mode, rm_cur);
gam_rc_t g_src;
if (word_mode == wm_byte && dst_mode == 0) {
g_src = getGAM(src_mode, src_reg, word_mode, rm_cur);
if (word_mode == wm_byte && dst_mode == 0)
setRegister(dst_reg, int8_t(g_src.value.value())); // int8_t: sign extension
}
else {
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur, false);
g_src = getGAM(src_mode, src_reg, word_mode, rm_cur);
set_flags = putGAM(g_dst, g_src.value.value());
}
@ -1293,6 +1298,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
// retrieve word from '15/14'-stack
uint16_t v = popStack();
b->addToMMR1(2, 6);
bool set_flags = true;
@ -1312,8 +1318,6 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if (set_flags)
setPSW_flags_nzv(v, wm_word);
b->addToMMR1(2, 6);
break;
}
@ -1607,7 +1611,6 @@ bool cpu::misc_operations(const uint16_t instr)
// PUSH link
pushStack(getRegister(link_reg));
b->addToMMR1(-2, 6);
// MOVE PC,link