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NEG fix

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folkert van heusden 2022-03-31 17:19:20 +02:00
parent a74dbe5bd1
commit f51f8de303
1 changed files with 9 additions and 8 deletions
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15
cpu.cpp
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@ -786,21 +786,22 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_n(SIGN(v, word_mode)); setPSW_n(SIGN(v, word_mode));
setPSW_z(v == 0); setPSW_z(v == 0);
setPSW_v(word_mode ? (v & 0xff) == 0x80 : v == 0x8000); setPSW_v(word_mode ? (v & 0xff) == 0x80 : v == 0x8000);
setPSW_c(v);
setRegister(dst_reg, false, v); setRegister(dst_reg, false, v);
} }
else { else {
uint16_t a = getGAMAddress(dst_mode, dst_reg, word_mode, false); uint16_t a = getGAMAddress(dst_mode, dst_reg, word_mode, false);
uint16_t v = b -> read(a, word_mode); uint16_t v = -b -> read(a, word_mode);
int32_t vl = word_mode ? uint8_t(-v) : -v;
b->write(a, word_mode, vl); b->write(a, word_mode, v);
setPSW_n(SIGN(vl, word_mode)); setPSW_n(SIGN(v, word_mode));
setPSW_z(vl == 0); setPSW_z(v == 0);
setPSW_v(word_mode ? vl == 0x80 : vl == 0x8000); setPSW_v(word_mode ? (v & 0xff) == 0x80 : v == 0x8000);
setPSW_c(vl); setPSW_c(v);
} }
break; break;
} }