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PPCRec: Implement MCRF, rework DCBZ

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Exzap 2024-10-20 04:25:21 +02:00
parent 972d0ed05d
commit 89f8f9bd2a
5 changed files with 57 additions and 68 deletions
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7
src/Cafe/HW/Espresso/Recompiler/IML/IMLOptimizer.cpp
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@ -649,7 +649,7 @@ void IMLOptimizer_RemoveDeadCodeFromSegment(IMLOptimizerRegIOAnalysis& regIoAnal
// Then for each segment:
// - Iterate instructions backwards
// - Maintain a list of registers which are read at a later point (initially this is the list from the first step)
// - If an instruction only modifies registers which are not in the read list, then it is dead code and can be replaced with a no-op
// - If an instruction only modifies registers which are not in the read list and has no side effects, then it is dead code and can be replaced with a no-op
std::unordered_set<IMLRegID> regsNeeded = regIoAnalysis.GetRegistersNeededAtEndOfSegment(seg);
@ -688,10 +688,7 @@ void IMLOptimizer_RemoveDeadCodeFromSegment(IMLOptimizerRegIOAnalysis& regIoAnal
registersUsed.ForEachReadGPR([&](IMLReg reg) {
regsNeeded.insert(reg.GetRegID());
});
// for now we only allow some instruction types to be deleted, eventually we should find a safer way to identify side effects that can't be judged by register usage alone
if(imlInstruction.type != PPCREC_IML_TYPE_R_R && imlInstruction.type != PPCREC_IML_TYPE_R_R_S32 && imlInstruction.type != PPCREC_IML_TYPE_COMPARE && imlInstruction.type != PPCREC_IML_TYPE_COMPARE_S32)
continue;
if(onlyWritesRedundantRegisters)
if(!imlInstruction.HasSideEffects() && onlyWritesRedundantRegisters)
{
imlInstruction.make_no_op();
}