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ppcopcodes: Cleanup ppc_rfi.

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Reduce the number of operations by 1
and make more clear what is happening.
This commit is contained in:
joevt
2025-04-15 02:16:41 -07:00
committed by Maxim Poliakovski
parent 0fe6ffeb6f
commit ec6fa9360c
1 changed files with 12 additions and 8 deletions
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cpu/ppc/ppcopcodes.cpp
+12 -8
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@@ -1416,12 +1416,16 @@ void dppc_interpreter::ppc_rfi(uint32_t opcode) {
return;
}
uint32_t old_msr_val = ppc_state.msr;
uint32_t new_srr1_val = (ppc_state.spr[SPR::SRR1] & 0x87C0FF73UL);
uint32_t new_msr_val = (ppc_state.msr & ~0x87C0FF73UL);
// keep 0, 5-9, 16-23, 25-27, 30-31 bits; exclude POW, ILE, and Reserved bits.
const uint32_t msr_bits_to_replace = 0x87C0FF73UL;
const uint32_t msr_bits_to_clear = MSR::POW;
new_msr_val = (new_msr_val | new_srr1_val) & 0xFFFBFFFFUL;
ppc_msr_did_change(old_msr_val, new_msr_val);
uint32_t bits_from_srr1 = ppc_state.spr[SPR::SRR1] &
(msr_bits_to_replace & ~msr_bits_to_clear);
uint32_t new_msr_val = (ppc_state.msr & ~(msr_bits_to_replace | msr_bits_to_clear)) |
bits_from_srr1;
ppc_msr_did_change(ppc_state.msr, new_msr_val);
// generate External Interrupt Exception
// if CPU interrupt line is still asserted
@@ -1584,10 +1588,10 @@ void dppc_interpreter::ppc_stu(uint32_t opcode) {
ea += ppc_result_a;
mmu_write_vmem<T>(opcode, ea, ppc_result_d);
ppc_state.gpr[reg_a] = ea;
}
}
else {
ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
}
}
}
@@ -1609,7 +1613,7 @@ void dppc_interpreter::ppc_stux(uint32_t opcode) {
}
else {
ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
}
}
}
template void dppc_interpreter::ppc_stux<uint8_t>(uint32_t opcode);