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ppcopcodes: optimize ppc_changecrf0() a bit.

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This commit is contained in:
Maxim Poliakovski 2020-02-10 23:07:39 +01:00
parent 36fc7a9aaa
commit 26bd402f44
1 changed files with 9 additions and 10 deletions
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19
cpu/ppc/ppcopcodes.cpp
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@ -132,21 +132,20 @@ void ppc_grab_regsdb() {
//Affects CR Field 0 - For integer operations
void ppc_changecrf0(uint32_t set_result) {
ppc_state.ppc_cr &= 0x0FFFFFFF;
ppc_state.ppc_cr &= 0x0FFFFFFFUL;
if (set_result == 0) {
ppc_state.ppc_cr |= 0x20000000UL;
}
else if (set_result & 0x80000000) {
ppc_state.ppc_cr |= 0x80000000UL;
}
else {
ppc_state.ppc_cr |= 0x40000000UL;
} else {
if (set_result & 0x80000000) {
ppc_state.ppc_cr |= 0x80000000UL;
} else {
ppc_state.ppc_cr |= 0x40000000UL;
}
}
if (ppc_state.ppc_spr[SPR::XER] & 0x80000000UL) {
ppc_state.ppc_cr |= 0x10000000UL;
}
/* copy XER[SO] into CR0[SO]. */
ppc_state.ppc_cr |= (ppc_state.ppc_spr[SPR::XER] >> 3) & 0x10000000UL;
}
//Affects the XER register's Carry Bit