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ppcopcodes: Fix subfme.

This commit is contained in:
joevt 2023-12-16 19:09:09 -08:00 committed by Maxim Poliakovski
parent bae488fd97
commit dc00879419
1 changed files with 13 additions and 3 deletions
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16
cpu/ppc/ppcopcodes.cpp
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@ -364,10 +364,20 @@ void dppc_interpreter::ppc_subfme() {
ppc_grab_regsda();
uint32_t grab_xer = !!(ppc_state.spr[SPR::XER] & 0x20000000);
ppc_result_d = ~ppc_result_a + grab_xer - 1;
ppc_carry(~ppc_result_a, ppc_result_d);
if (oe_flag)
ppc_setsoov(0xFFFFFFFF, ppc_result_a, ppc_result_d);
if (ppc_result_d == ppc_result_a) {
// this only occurs when CA is 0 and ppc_result_a is 0x7fffffff or 0xffffffff
if ((int32_t)ppc_result_d > 0) {
ppc_state.spr[SPR::XER] |= oe_flag ? 0xE0000000UL : 0x20000000UL; // set SO,OV,CA
} else {
ppc_state.spr[SPR::XER] &= oe_flag ? ~0x60000000UL : ~0x20000000UL; // clear OV,CA
}
} else {
ppc_state.spr[SPR::XER] |= 0x20000000UL; // set CA
if (oe_flag)
ppc_state.spr[SPR::XER] &= ~0x40000000UL; // clear OV
}
if (rc_flag)
ppc_changecrf0(ppc_result_d);