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Optimize left shift by four from byte to int

This commit is contained in:
drmortalwombat 2023-01-12 22:57:19 +01:00
parent d6fcb5f9ca
commit a9d3673f4e
2 changed files with 65 additions and 1 deletions
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64
oscar64/NativeCodeGenerator.cpp
View File

@ -9067,6 +9067,21 @@ NativeCodeBasicBlock* NativeCodeBasicBlock::BinaryOperator(InterCodeProcedure* p
mIns.Push(NativeCodeInstruction(ASMIT_ROR, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, treg + 0));
}
else if (shift == 4 && ins->mSrc[1].IsUByte() && ins->mSrc[1].mRange.mMaxValue >= 128)
{
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_TMP + proc->mTempOffset[ins->mSrc[1].mTemp]));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_TAX, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_AND, ASMIM_IMMEDIATE, 0x0f));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, treg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_TXA, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_AND, ASMIM_IMMEDIATE, 0xf0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, treg));
}
else if (shift >= 8)
{
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_TMP + proc->mTempOffset[ins->mSrc[1].mTemp]));
@ -18259,7 +18274,7 @@ bool NativeCodeBasicBlock::JoinTAXARange(int from, int to)
int i = from + 1;
while (i < to && (mIns[i].mType == ASMIT_LDA || mIns[i].mType == ASMIT_STA) && (mIns[i].mMode == ASMIM_IMMEDIATE || mIns[i].mMode == ASMIM_ABSOLUTE || mIns[i].mMode == ASMIM_ZERO_PAGE))
while (i < to && (mIns[i].mType == ASMIT_LDA || mIns[i].mType == ASMIT_STA) && (mIns[i].mMode == ASMIM_IMMEDIATE || mIns[i].mMode == ASMIM_IMMEDIATE_ADDRESS || mIns[i].mMode == ASMIM_ABSOLUTE || mIns[i].mMode == ASMIM_ZERO_PAGE))
i++;
if (i == to)
{
@ -21057,6 +21072,37 @@ bool NativeCodeBasicBlock::ReverseLoadCommutativeOpUp(int aload, int aop)
return false;
}
bool NativeCodeBasicBlock::MoveLDSTXOutOfRange(int at)
{
int j = at + 2;
while (j < mIns.Size())
{
if (mIns[at + 1].mType == ASMIM_ZERO_PAGE)
{
if (mIns[j].ReferencesZeroPage(mIns[at + 1].mAddress))
return false;
}
else if (mIns[j].MayBeSameAddress(mIns[at + 1]))
return false;
if (mIns[j].mType == ASMIT_JSR)
return false;
if (!(mIns[j].mLive & LIVE_CPU_REG_A))
{
mIns.Insert(j + 1, NativeCodeInstruction(ASMIT_STA, mIns[at + 1]));
mIns.Insert(j + 1, NativeCodeInstruction(ASMIT_LDA, mIns[at]));
mIns.Remove(at, 2);
return true;
}
j++;
}
return false;
}
bool NativeCodeBasicBlock::MoveLoadShiftStoreUp(int at)
{
int j = at - 1;
@ -25896,6 +25942,22 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
#endif
#if 1
// move ldx/stx down and convert to accu
//
for (int i = mIns.Size() - 2 ; i >= 0; i--)
{
if (mIns[i].mType == ASMIT_LDX && (mIns[i].mMode == ASMIM_IMMEDIATE|| mIns[i].mMode == ASMIM_IMMEDIATE_ADDRESS) && mIns[i + 1].mType == ASMIT_STX && !(mIns[i + 1].mLive & LIVE_CPU_REG_X))
{
if (MoveLDSTXOutOfRange(i))
changed = true;
}
}
CheckLive();
#endif
#if 1
// move load - add # - store up to initial store

2
oscar64/NativeCodeGenerator.h
View File

@ -311,6 +311,8 @@ public:
bool MoveLoadShiftRotateUp(int at);
bool MoveLoadShiftStoreUp(int at);
bool MoveLDSTXOutOfRange(int at);
bool MoveCLCLoadAddZPStoreDown(int at);
bool FindDirectAddressSumY(int at, int reg, int& apos, int& breg);
bool PatchDirectAddressSumY(int at, int reg, int apos, int breg);