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e132xs: fix regression with dynabomb, nw

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This commit is contained in:
mooglyguy 2017-11-15 22:16:39 +01:00
parent 60b10988ba
commit 7791f460d4
1 changed files with 4 additions and 3 deletions
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7
src/devices/cpu/e132xs/e132xsop.hxx
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@ -924,12 +924,13 @@ void hyperstone_device::hyperstone_subc()
uint32_t dreg = (DST_GLOBAL ? m_global_regs : m_local_regs)[dst_code];
const uint32_t c = GET_C;
uint32_t old_z = SR & Z_MASK;
SR &= ~(C_MASK | V_MASK | Z_MASK | N_MASK);
if (SRC_GLOBAL && (src_code == SR_REGISTER))
{
const uint64_t tmp = uint64_t(dreg) - uint64_t(c);
SR |= ((tmp ^ dreg) & dreg & 0x80000000);
SR |= ((tmp ^ dreg) & dreg & 0x80000000) >> 28;
SR |= (tmp & 0x100000000) >> 32;
dreg -= c;
}
@ -939,7 +940,7 @@ void hyperstone_device::hyperstone_subc()
const uint64_t tmp = uint64_t(dreg) - (uint64_t(sreg) + uint64_t(c));
//CHECK!
const uint32_t sreg_c = sreg + c;
SR |= ((tmp ^ dreg) & (dreg ^ sreg_c) & 0x80000000);
SR |= ((tmp ^ dreg) & (dreg ^ sreg_c) & 0x80000000) >> 28;
SR |= (tmp & 0x100000000) >> 32;
dreg -= sreg_c;
}
@ -949,7 +950,7 @@ void hyperstone_device::hyperstone_subc()
else
m_local_regs[dst_code] = dreg;
if (dreg == 0)
if (old_z && dreg == 0)
SR |= Z_MASK;
SR |= SIGN_TO_N(dreg);