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Improve peephole optimizer for shifts

This commit is contained in:
drmortalwombat 2024-07-18 14:18:06 +02:00
parent d0fb062006
commit efd688320f
1 changed files with 109 additions and 3 deletions
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112
oscar64/NativeCodeGenerator.cpp
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@ -7652,6 +7652,20 @@ NativeCodeBasicBlock * NativeCodeBasicBlock::CopyValue(InterCodeProcedure* proc,
}
}
}
else if (size <= 128)
{
NativeCodeBasicBlock* lblock = nproc->AllocateBlock();
NativeCodeBasicBlock* eblock = nproc->AllocateBlock();
block->mIns.Push(NativeCodeInstruction(ins, ASMIT_LDY, ASMIM_IMMEDIATE, size - 1));
block->Close(ins, lblock, nullptr, ASMIT_JMP);
lblock->mIns.Push(NativeCodeInstruction(ins, ASMIT_LDA, ASMIM_ABSOLUTE_Y, ins->mSrc[0].mIntConst + offset, ins->mSrc[0].mLinkerObject, flags));
lblock->mIns.Push(NativeCodeInstruction(ins, ASMIT_STA, ASMIM_ABSOLUTE_Y, ins->mSrc[1].mIntConst + offset, ins->mSrc[1].mLinkerObject, flags));
lblock->mIns.Push(NativeCodeInstruction(ins, ASMIT_DEY, ASMIM_IMPLIED));
lblock->Close(ins, lblock, eblock, ASMIT_BPL);
block = eblock;
}
else
{
NativeCodeBasicBlock* lblock = nproc->AllocateBlock();
@ -12880,6 +12894,18 @@ void NativeCodeBasicBlock::RelationalOperator(InterCodeProcedure* proc, const In
mIns.Push(NativeCodeInstruction(ins, ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_TMP + proc->mTempOffset[ins->mSrc[1].mTemp]));
this->Close(ins, falseJump, trueJump, ASMIT_BEQ);
}
#endif
#if 1
// Special case >= or < with multiple of 256, no need to check low byte then
else if (ins->mSrc[0].mTemp < 0 && !(ins->mSrc[0].mIntConst & 255) && op == IA_CMPGEU)
{
if (ins->mSrc[1].mTemp < 0)
mIns.Push(NativeCodeInstruction(ins, ASMIT_LDA, ASMIM_IMMEDIATE, ins->mSrc[1].mIntConst >> 8));
else
mIns.Push(NativeCodeInstruction(ins, ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_TMP + proc->mTempOffset[ins->mSrc[1].mTemp] + 1));
mIns.Push(NativeCodeInstruction(ins, ASMIT_CMP, ASMIM_IMMEDIATE, ins->mSrc[0].mIntConst >> 8));
this->Close(ins, trueJump, falseJump, ASMIT_BCS);
}
#endif
else if (ins->mSrc[0].IsUByte() && ins->mSrc[1].IsUByte())
{
@ -36912,6 +36938,31 @@ bool NativeCodeBasicBlock::OptimizeSimpleLoopInvariant(NativeCodeProcedure* proc
}
#endif
if (sz >= 2 && (mIns[0].mType == ASMIT_ASL || mIns[0].mType == ASMIT_LSR) && mIns[0].mMode == ASMIM_ZERO_PAGE &&
mIns[sz - 1].mType == ASMIT_LDA && mIns[sz - 1].SameEffectiveAddress(mIns[0]))
{
if (!ChangesZeroPage(mIns[0].mAddress, 1, sz - 1) && !ReferencesZeroPage(mIns[0].mAddress, 1, sz - 1) && !ReferencesAccu(0, sz - 1))
{
if (!prevBlock)
return OptimizeSimpleLoopInvariant(proc, full);
prevBlock->mIns.Push(NativeCodeInstruction(mIns[0].mIns, ASMIT_LDA, mIns[0]));
prevBlock->mExitRequiredRegs += CPU_REG_A;
exitBlock->mEntryRequiredRegs += CPU_REG_A;
exitBlock->mIns.Insert(0, NativeCodeInstruction(mIns[0].mIns, ASMIT_STA, mIns[0]));
mEntryRequiredRegs += CPU_REG_A;
mExitRequiredRegs += CPU_REG_A;
mIns[0].mMode = ASMIM_IMPLIED;
mIns[sz - 1].mType = ASMIT_ORA; mIns[sz - 1].mMode = ASMIM_IMMEDIATE; mIns[sz - 1].mAddress = 0;
for (int i = 0; i < sz; i++)
mIns[i].mLive |= LIVE_CPU_REG_A;
changed = true;
}
}
if (sz >= 2 && (mIns[0].mType == ASMIT_DEC || mIns[0].mType == ASMIT_INC) && mIns[0].mMode == ASMIM_ZERO_PAGE &&
mIns[1].mType == ASMIT_LDY && mIns[1].SameEffectiveAddress(mIns[0]))
{
@ -39168,6 +39219,26 @@ bool NativeCodeBasicBlock::OptimizeGenericLoop(NativeCodeProcedure* proc)
zareg[ins.mAddress] = -1;
}
break;
#if 0
case ASMIT_ASL:
case ASMIT_LSR:
case ASMIT_ROL:
case ASMIT_ROR:
if (ins.mMode == ASMIM_ZERO_PAGE)
{
if (zareg[ins.mAddress] >= 0)
{
if (ins.mLive & LIVE_CPU_REG_A)
zareg[ins.mAddress] = -1;
else
zareg[ins.mAddress] += 3;
}
zxreg[ins.mAddress] = -1;
zyreg[ins.mAddress] = -1;
}
break;
#endif
case ASMIT_LDA:
if (ins.mMode == ASMIM_ZERO_PAGE)
{
@ -39417,6 +39488,14 @@ bool NativeCodeBasicBlock::OptimizeGenericLoop(NativeCodeProcedure* proc)
xskew = 0;
}
break;
case ASMIT_ASL:
case ASMIT_LSR:
case ASMIT_ROL:
case ASMIT_ROR:
if (ins.mMode == ASMIM_ZERO_PAGE && ins.mAddress == areg)
ins.mMode = ASMIM_IMPLIED;
break;
case ASMIT_INC:
if (ins.mMode == ASMIM_ZERO_PAGE && ins.mAddress == yreg)
{
@ -41239,7 +41318,8 @@ void NativeCodeBasicBlock::BlockSizeReduction(NativeCodeProcedure* proc, int xen
bool NativeCodeBasicBlock::ReferencesAccu(int from, int to) const
{
for (int i = from; i < mIns.Size(); i++)
if (to > mIns.Size()) to = mIns.Size();
for (int i = from; i < to; i++)
if (mIns[i].ReferencesAccu())
return true;
return false;
@ -43217,6 +43297,32 @@ bool NativeCodeBasicBlock::PeepHoleOptimizerIterate2(int i, int pass)
mIns[i + 1].mType = ASMIT_NOP; mIns[i + 1].mMode = ASMIM_IMPLIED;
return true;
}
else if (
mIns[i + 0].mType == ASMIT_LDY && mIns[i + 0].mMode == ASMIM_ABSOLUTE_X &&
mIns[i + 1].mType == ASMIT_STA && mIns[i + 1].mMode == ASMIM_ABSOLUTE_X &&
mIns[i + 0].mLinkerObject == mIns[i + 1].mLinkerObject &&
mIns[i + 0].mAddress != mIns[i + 1].mAddress &&
!(mIns[i + 0].mFlags & NCIF_VOLATILE) &&
!(mIns[i + 1].mFlags & NCIF_VOLATILE))
{
NativeCodeInstruction ins(mIns[i + 0]);
mIns[i + 0] = mIns[i + 1];
mIns[i + 1] = ins;
return true;
}
else if (
mIns[i + 0].mType == ASMIT_LDX && mIns[i + 0].mMode == ASMIM_ABSOLUTE_Y &&
mIns[i + 1].mType == ASMIT_STA && mIns[i + 1].mMode == ASMIM_ABSOLUTE_Y &&
mIns[i + 0].mLinkerObject == mIns[i + 1].mLinkerObject &&
mIns[i + 0].mAddress != mIns[i + 1].mAddress &&
!(mIns[i + 0].mFlags & NCIF_VOLATILE) &&
!(mIns[i + 1].mFlags & NCIF_VOLATILE))
{
NativeCodeInstruction ins(mIns[i + 0]);
mIns[i + 0] = mIns[i + 1];
mIns[i + 1] = ins;
return true;
}
#if 0
else if (
@ -43602,7 +43708,7 @@ bool NativeCodeBasicBlock::PeepHoleOptimizerIterate3(int i, int pass)
return true;
}
else if (
mIns[i + 0].mType == ASMIT_LDA && (mIns[i + 0].mMode == ASMIM_ZERO_PAGE || mIns[i + 0].mMode == ASMIM_ABSOLUTE) &&
mIns[i + 0].mType == ASMIT_LDA && (mIns[i + 0].mMode == ASMIM_ZERO_PAGE || mIns[i + 0].mMode == ASMIM_ABSOLUTE || mIns[i + 0].mMode == ASMIM_ABSOLUTE_X) &&
mIns[i + 1].IsShift() &&
mIns[i + 2].mType == ASMIT_STA && mIns[i + 2].SameEffectiveAddress(mIns[i + 0]) && !(mIns[i + 2].mLive & LIVE_CPU_REG_A))
{
@ -49791,7 +49897,7 @@ void NativeCodeProcedure::Compile(InterCodeProcedure* proc)
mInterProc = proc;
mInterProc->mLinkerObject->mNativeProc = this;
CheckFunc = !strcmp(mInterProc->mIdent->mString, "diggers_move");
CheckFunc = !strcmp(mInterProc->mIdent->mString, "binlog");
int nblocks = proc->mBlocks.Size();
tblocks = new NativeCodeBasicBlock * [nblocks];