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implementation for v-flag when doing ADD was wrong

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This commit is contained in:
folkert van heusden 2023-03-19 18:08:43 +01:00
parent daf5e27842
commit d703d38ea2
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 1 additions and 2 deletions
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3
cpu.cpp
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@ -509,7 +509,6 @@ bool cpu::double_operand_instructions(const uint16_t instr)
result = (g_dst.value.value() - g_ssrc.value.value()) & 0xffff;
if (set_flags) {
//setPSW_v(sign(g_ssrc.value.value()) != sign(g_dst.value.value()) && sign(g_ssrc.value.value()) == sign(result));
setPSW_v(((g_ssrc.value.value() ^ g_dst.value.value()) & 0x8000) && !((g_dst.value.value() ^ result) & 0x8000));
setPSW_c(uint16_t(g_dst.value.value()) < uint16_t(g_ssrc.value.value()));
}
@ -518,7 +517,7 @@ bool cpu::double_operand_instructions(const uint16_t instr)
result = (g_dst.value.value() + g_ssrc.value.value()) & 0xffff;
if (set_flags) {
setPSW_v(sign(g_ssrc.value.value()) == sign(g_dst.value.value()) && sign(g_dst.value.value()) != sign(result));
setPSW_v((result ^ g_ssrc.value.value()) & (result ^ g_ssrc.value.value()));
setPSW_c(uint16_t(result) < uint16_t(g_ssrc.value.value()));
}
}