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Tweaking conditional branch instructions

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dingusdev 2024-11-20 18:23:03 -07:00
parent d279ada718
commit 0835e6f9f4
1 changed files with 10 additions and 9 deletions
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19
cpu/ppc/ppcopcodes.cpp
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@ -1142,7 +1142,7 @@ void dppc_interpreter::ppc_bc() {
}
if (l)
ppc_state.spr[SPR::LR] = ppc_state.pc + 4;
ppc_state.spr[SPR::LR] = uint32_t(ppc_state.pc + 4);
}
template void dppc_interpreter::ppc_bc<LK0, AA0>();
@ -1159,16 +1159,17 @@ void dppc_interpreter::ppc_bcctr() {
uint32_t ctr = ppc_state.spr[SPR::CTR];
uint32_t new_ctr;
if (for601) {
new_ctr = ctr - 1;
if (!(br_bo & 0x04)) {
ppc_state.spr[SPR::CTR] = new_ctr; /* decrement CTR */
}
}
else {
if (!(br_bo & 0x04))
ppc_state.spr[SPR::CTR] = new_ctr;
ctr_ok = (br_bo & 0x04) | ((new_ctr != 0) == !(br_bo & 0x02));
} else {
new_ctr = ctr;
ctr_ok = 1;
}
ctr_ok = (br_bo & 0x04) | ((new_ctr != 0) == !(br_bo & 0x02));
cnd_ok = (br_bo & 0x10) | (!(ppc_state.cr & (0x80000000UL >> br_bi)) == !(br_bo & 0x08));
if (ctr_ok && cnd_ok) {
@ -1177,7 +1178,7 @@ void dppc_interpreter::ppc_bcctr() {
}
if (l)
ppc_state.spr[SPR::LR] = ppc_state.pc + 4;
ppc_state.spr[SPR::LR] = uint32_t(ppc_state.pc + 4);
}
template void dppc_interpreter::ppc_bcctr<LK0, NOT601>();
@ -1204,7 +1205,7 @@ void dppc_interpreter::ppc_bclr() {
}
if (l)
ppc_state.spr[SPR::LR] = ppc_state.pc + 4;
ppc_state.spr[SPR::LR] = uint32_t(ppc_state.pc + 4);
}
template void dppc_interpreter::ppc_bclr<LK0>();