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code clean-up

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folkert van heusden 2022-03-24 16:47:18 +01:00
parent b9ec3ec77f
commit 15fd3411a5
1 changed files with 3 additions and 8 deletions
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11
cpu.cpp
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@ -428,7 +428,7 @@ bool cpu::double_operand_instructions(const uint16_t instr)
int16_t result = 0; int16_t result = 0;
if (instr & 0x8000) { if (instr & 0x8000) {
result = (dst_value + ~src_value + 1) & 0xffff; result = (dst_value - src_value) & 0xffff;
setPSW_v(sign(src_value) != sign(dst_value) && sign(src_value) == sign(result)); setPSW_v(sign(src_value) != sign(dst_value) && sign(src_value) == sign(result));
setPSW_c(uint16_t(dst_value) < uint16_t(src_value)); setPSW_c(uint16_t(dst_value) < uint16_t(src_value));
} }
@ -606,15 +606,10 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
} }
case 7: { // SOB case 7: { // SOB
uint16_t oldPC = getPC(); addRegister(reg, false, -1);
if (reg == 7)
addRegister(reg, false, -2);
else
addRegister(reg, false, -1);
if (getRegister(reg, false)) { if (getRegister(reg, false)) {
uint16_t newPC = oldPC - dst * 2; uint16_t newPC = getPC() - dst * 2;
setPC(newPC); setPC(newPC);
} }