fabi/Xenia-Canary
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[CPU/PPC] Implement mcrxr instruction

Browse Source 
Implement mcrxr (Move to Condition Register from XER).

Copies XER condition bits (SO, OV, CA) to a CR field and
clears those bits in XER. This was previously unimplemented.
This commit is contained in:
Herman S.
2025-10-19 14:03:55 +09:00
parent b5d2eea07b
commit fb76cbb291
1 changed files with 21 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
src/xenia/cpu/ppc/ppc_emit_control.cc
View File

@@ -430,6 +430,26 @@ int InstrEmit_mcrf(PPCHIRBuilder& f, const InstrData& i) {
return 0;
}
int InstrEmit_mcrxr(PPCHIRBuilder& f, const InstrData& i) {
// CR[4*CRFD:4*CRFD+3] <- XER[0:3]
// XER[0:3] <- 0
// XER bits: SO (bit 31), OV (bit 30), CA (bit 29), reserved (bit 28)
uint32_t crfd = i.X.RT >> 2;
Value* xer = f.LoadXER();
// Extract XER[0:3] which are bits 31-28
Value* xer_bits = f.And(f.Shr(xer, 28), f.LoadConstantUint64(0xF));
// Store to CR field
f.StoreCR(crfd, f.Shl(xer_bits, 4 * (7 - crfd)));
// Clear XER[0:3] (bits 31-28)
f.StoreXER(f.And(xer, f.LoadConstantUint64(~(0xFULL << 28))));
return 0;
}
// System linkage (A-24)
int InstrEmit_sc(PPCHIRBuilder& f, const InstrData& i) {
@@ -831,6 +851,7 @@ void RegisterEmitCategoryControl() {
XEREGISTERINSTR(crorc);
XEREGISTERINSTR(crxor);
XEREGISTERINSTR(mcrf);
XEREGISTERINSTR(mcrxr);
XEREGISTERINSTR(sc);
XEREGISTERINSTR(td);
XEREGISTERINSTR(tdi);