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Optimize negative const offsets in array index

This commit is contained in:
drmortalwombat 2022-09-17 22:36:17 +02:00
parent bd2e198339
commit 0835b90219
2 changed files with 64 additions and 0 deletions
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62
oscar64/InterCode.cpp
View File

@ -7670,6 +7670,66 @@ void InterCodeBasicBlock::PerformValueForwarding(const GrowingInstructionPtrArra
ins->mSrc[1].mTemp = cai->mDst.mTemp;
}
}
else if (mi0 && mi1 && mi0->mCode == IC_CONSTANT && mi1->mCode == IC_BINARY_OPERATOR && mi1->mOperator == IA_SUB)
{
InterInstruction* ai0 = ltvalue[mi1->mSrc[0].mTemp], * ai1 = ltvalue[mi1->mSrc[1].mTemp];
if (ai0 && ai0->mCode == IC_CONSTANT)
{
InterInstruction* nai = new InterInstruction();
nai->mCode = IC_BINARY_OPERATOR;
nai->mOperator = IA_MUL;
nai->mSrc[0].mTemp = mi1->mSrc[1].mTemp;
nai->mSrc[0].mType = IT_INT16;
nai->mSrc[1].mTemp = ins->mSrc[0].mTemp;
nai->mSrc[1].mType = IT_INT16;
nai->mDst.mTemp = spareTemps++;
nai->mDst.mType = IT_INT16;
mInstructions.Insert(i, nai);
ltvalue[nai->mDst.mTemp] = nullptr;
InterInstruction* cai = new InterInstruction();
cai->mCode = IC_CONSTANT;
cai->mDst.mTemp = spareTemps++;
cai->mDst.mType = IT_INT16;
cai->mConst.mIntConst = ai0->mConst.mIntConst * mi0->mConst.mIntConst;
mInstructions.Insert(i, cai);
ltvalue[cai->mDst.mTemp] = nullptr;
ins->mOperator = IA_SUB;
ins->mSrc[1].mTemp = nai->mDst.mTemp;
ins->mSrc[0].mTemp = cai->mDst.mTemp;
}
else if (ai1 && ai1->mCode == IC_CONSTANT)
{
InterInstruction* nai = new InterInstruction();
nai->mCode = IC_BINARY_OPERATOR;
nai->mOperator = IA_MUL;
nai->mSrc[0].mTemp = mi1->mSrc[0].mTemp;
nai->mSrc[0].mType = IT_INT16;
nai->mSrc[1].mTemp = ins->mSrc[0].mTemp;
nai->mSrc[1].mType = IT_INT16;
nai->mDst.mTemp = spareTemps++;
nai->mDst.mType = IT_INT16;
mInstructions.Insert(i, nai);
ltvalue[nai->mDst.mTemp] = nullptr;
InterInstruction* cai = new InterInstruction();
cai->mCode = IC_CONSTANT;
cai->mDst.mTemp = spareTemps++;
cai->mDst.mType = IT_INT16;
cai->mConst.mIntConst = ai1->mConst.mIntConst * mi0->mConst.mIntConst;
mInstructions.Insert(i, cai);
ltvalue[cai->mDst.mTemp] = nullptr;
ins->mOperator = IA_SUB;
ins->mSrc[1].mTemp = nai->mDst.mTemp;
ins->mSrc[0].mTemp = cai->mDst.mTemp;
}
}
}
#endif
#if 1
@ -12568,6 +12628,8 @@ void InterCodeProcedure::Close(void)
ResetVisited();
mEntryBlock->PerformValueForwarding(mValueForwardingTable, valueSet, tvalidSet, mLocalAliasedSet, mParamAliasedSet, numTemps, mModule->mGlobalVars);
DisassembleDebug("PerformValueForwarding");
ResetVisited();
eliminated = mEntryBlock->EliminateDeadBranches();
if (eliminated)

2
oscar64/NativeCodeGenerator.cpp
View File

@ -24657,6 +24657,7 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
(mIns[i + 0].mType == ASMIT_INX || mIns[i + 0].mType == ASMIT_DEX) &&
mIns[i + 1].mType == ASMIT_TXA && !(mIns[i + 1].mLive & LIVE_CPU_REG_A))
{
mIns[i + 0].mLive |= LIVE_CPU_REG_Z;
mIns[i + 1].mType = ASMIT_NOP; mIns[i + 1].mMode = ASMIM_IMPLIED;
progress = true;
}
@ -24664,6 +24665,7 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
(mIns[i + 0].mType == ASMIT_INY || mIns[i + 0].mType == ASMIT_DEY) &&
mIns[i + 1].mType == ASMIT_TYA && !(mIns[i + 1].mLive & LIVE_CPU_REG_A))
{
mIns[i + 0].mLive |= LIVE_CPU_REG_Z;
mIns[i + 1].mType = ASMIT_NOP; mIns[i + 1].mMode = ASMIM_IMPLIED;
progress = true;
}