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ppcopcodes: Fix subfze.

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joevt 2023-12-16 23:31:54 -08:00 committed by Maxim Poliakovski
parent 679e80a7c3
commit 1f3505f371
1 changed files with 18 additions and 5 deletions
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23
cpu/ppc/ppcopcodes.cpp
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@ -385,18 +385,31 @@ void dppc_interpreter::ppc_subfme() {
void dppc_interpreter::ppc_subfze() {
ppc_grab_regsda();
ppc_result_d = ~ppc_result_a + (ppc_state.spr[SPR::XER] & 0x20000000);
ppc_carry(~ppc_result_a, ppc_result_d);
ppc_result_d = ~ppc_result_a + !!(ppc_state.spr[SPR::XER] & 0x20000000);
if (ppc_result_d == ppc_result_a) {
// this only occurs when CA is 1 and ppc_result_a is 0x00000000 or 0x80000000
if (ppc_result_d == 0) {
ppc_state.spr[SPR::XER] |= 0x20000000UL; // set CA
if (oe_flag)
ppc_state.spr[SPR::XER] &= ~0x40000000UL; // clear OV
} else {
ppc_state.spr[SPR::XER] &= ~0x20000000UL; // clear CA
if (oe_flag)
ppc_state.spr[SPR::XER] |= 0xC0000000UL; // set SO,OV
}
} else {
ppc_state.spr[SPR::XER] &= ~0x20000000UL; // clear CA
if (oe_flag)
ppc_state.spr[SPR::XER] &= ~0x40000000UL; // clear OV
}
if (oe_flag)
ppc_setsoov(0, ppc_result_a, ppc_result_d);
if (rc_flag)
ppc_changecrf0(ppc_result_d);
ppc_store_result_regd();
}
void dppc_interpreter::ppc_and() {
ppc_grab_regssab();
ppc_result_a = ppc_result_d & ppc_result_b;