frederik
/
oscar64
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Some peephole optimizations for native code

This commit is contained in:
drmortalwombat 2021-10-14 21:22:03 +02:00
parent 9e7773a0f9
commit 1a30d044c8
3 changed files with 117 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
oscar64/Emulator.cpp
View File

@ -671,9 +671,11 @@ int Emulator::Emulate(int startIP)
if (mRegS == 0)
{
#if 0
for (int i = 0; i < 256; i++)
if (mMemory[i] != 0)
printf("ZP %02x : %02x\n", i, mMemory[i]);
#endif
DumpCycles();
return int16(mMemory[BC_REG_ACCU] + 256 * mMemory[BC_REG_ACCU + 1]);
}

114
oscar64/NativeCodeGenerator.cpp
View File

@ -540,6 +540,15 @@ bool NativeCodeInstruction::ChangesGlobalMemory(void) const
return false;
}
bool NativeCodeInstruction::ChangesCarry(void) const
{
return
mType == ASMIT_CLC || mType == ASMIT_SEC ||
mType == ASMIT_ADC || mType == ASMIT_SBC ||
mType == ASMIT_LSR || mType == ASMIT_ASL || mType == ASMIT_ROL || mType == ASMIT_ROR ||
mType == ASMIT_CMP || mType == ASMIT_CPX || mType == ASMIT_CPY ||
mType == ASMIT_JSR;
}
bool NativeCodeInstruction::RequiresAccu(void) const
{
@ -6197,7 +6206,7 @@ void NativeCodeBasicBlock::LoadEffectiveAddress(InterCodeProcedure* proc, const
if (ins->mSrc[0].mTemp < 0)
{
NativeCodeInstruction ainsl(ASMIT_ADC, ASMIM_IMMEDIATE, ins->mSrc[0].mIntConst & 0xff);
NativeCodeInstruction ainsh(ASMIT_ADC, ASMIM_IMMEDIATE, (ins->mSrc[1].mIntConst >> 8) & 0xff);
NativeCodeInstruction ainsh(ASMIT_ADC, ASMIM_IMMEDIATE, (ins->mSrc[0].mIntConst >> 8) & 0xff);
LoadValueToReg(proc, sins1, BC_REG_TMP + proc->mTempOffset[ins->mDst.mTemp], &ainsl, &ainsh);
}
@ -6938,6 +6947,37 @@ bool NativeCodeBasicBlock::MoveLoadStoreUp(int at)
return false;
}
bool NativeCodeBasicBlock::MoveLoadAddImmStoreUp(int at)
{
int j = at - 1;
while (j > 0)
{
if (mIns[j].mType == ASMIT_STA && mIns[j].mMode == ASMIM_ZERO_PAGE && mIns[j].mAddress == mIns[at + 1].mAddress)
{
mIns.Insert(j + 1, mIns[at + 3]); // STA
mIns.Insert(j + 1, mIns[at + 3]); // ADC
mIns.Insert(j + 1, mIns[at + 2]); // CLC
mIns[at + 3].mType = ASMIT_NOP; mIns[at + 3].mMode = ASMIM_IMPLIED;
mIns[at + 4].mType = ASMIT_NOP; mIns[at + 4].mMode = ASMIM_IMPLIED;
mIns[at + 5].mType = ASMIT_NOP; mIns[at + 5].mMode = ASMIM_IMPLIED;
mIns[at + 6].mType = ASMIT_NOP; mIns[at + 6].mMode = ASMIM_IMPLIED;
return true;
}
if (mIns[j].ChangesZeroPage(mIns[at + 1].mAddress))
return false;
if (mIns[j].UsesZeroPage(mIns[at + 3].mAddress))
return false;
if (mIns[j].ChangesCarry())
return false;
j--;
}
return false;
}
bool NativeCodeBasicBlock::ValueForwarding(const NativeRegisterDataSet& data)
{
bool changed = false;
@ -7405,6 +7445,24 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(void)
}
#endif
#if 1
// move load - add #- store up to initial store
//
for (int i = 2; i + 3 < mIns.Size(); i++)
{
if (
mIns[i + 0].mType == ASMIT_CLC &&
mIns[i + 1].mType == ASMIT_LDA && mIns[i + 1].mMode == ASMIM_ZERO_PAGE &&
mIns[i + 2].mType == ASMIT_ADC && mIns[i + 2].mMode == ASMIM_IMMEDIATE &&
mIns[i + 3].mType == ASMIT_STA && mIns[i + 3].mMode == ASMIM_ZERO_PAGE && (mIns[i + 3].mLive & (LIVE_CPU_REG_A | LIVE_CPU_REG_Z)) == 0)
{
if (MoveLoadAddImmStoreUp(i))
changed = true;
}
}
#endif
//
// shorten x/y register livetime
@ -7583,6 +7641,11 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(void)
mIns[i + 1].mType = ASMIT_LSR;
progress = true;
}
else if (mIns[i].mType == ASMIT_LDA && mIns[i].mMode == ASMIM_IMMEDIATE && mIns[i].mAddress == 0 && mIns[i + 1].mType == ASMIT_LSR && mIns[i + 1].mMode == ASMIM_IMPLIED)
{
mIns[i + 1].mType = ASMIT_CLC;
progress = true;
}
else if (mIns[i].mType == ASMIT_CLC && mIns[i + 1].mType == ASMIT_ADC && mIns[i + 1].mMode == ASMIM_IMMEDIATE && mIns[i + 1].mAddress == 0 && !(mIns[i + 1].mLive & LIVE_CPU_REG_Z))
{
mIns[i + 1].mType = ASMIT_NOP;
@ -7630,6 +7693,15 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(void)
mIns[i + 0].mLive |= LIVE_CPU_REG_A;
progress = true;
}
else if (
(mIns[i + 0].mType == ASMIT_ASL || mIns[i + 0].mType == ASMIT_LSR || mIns[i + 0].mType == ASMIT_ROL || mIns[i + 0].mType == ASMIT_ROR) && mIns[i + 0].mMode == ASMIM_ZERO_PAGE &&
mIns[i + 1].mType == ASMIT_LDA && mIns[i + 1].mMode == ASMIM_ZERO_PAGE && mIns[i + 1].mAddress == mIns[i + 0].mAddress && !(mIns[i + 1].mLive & LIVE_MEM))
{
mIns[i + 1].mType = mIns[i + 0].mType;
mIns[i + 1].mMode = ASMIM_IMPLIED;
mIns[i + 0].mType = ASMIT_LDA;
progress = true;
}
}
@ -7851,6 +7923,46 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(void)
progress = true;
}
#if 1
else if (
mIns[i + 0].mType == ASMIT_STA && mIns[i + 0].mMode == ASMIM_ZERO_PAGE &&
mIns[i + 1].mType == ASMIT_LDA && mIns[i + 1].mMode == ASMIM_ZERO_PAGE && mIns[i + 0].mAddress != mIns[i + 1].mAddress &&
mIns[i + 2].mType == ASMIT_SEC &&
mIns[i + 3].mType == ASMIT_SBC && mIns[i + 3].mMode == ASMIM_ZERO_PAGE && mIns[i + 0].mAddress == mIns[i + 3].mAddress && !(mIns[i + 3].mLive & LIVE_MEM))
{
mIns[i + 0].mType = ASMIT_EOR;
mIns[i + 0].mMode = ASMIM_IMMEDIATE;
mIns[i + 0].mAddress = 0xff;
mIns[i + 3].mType = ASMIT_ADC;
mIns[i + 3].mAddress = mIns[i + 1].mAddress;
mIns[i + 1].mType = ASMIT_NOP;
mIns[i + 1].mMode = ASMIM_IMPLIED;
progress = true;
}
#endif
#if 1
else if (
mIns[i + 0].mType == ASMIT_STA && mIns[i + 0].mMode == ASMIM_ZERO_PAGE &&
mIns[i + 1].mType == ASMIT_SEC &&
mIns[i + 2].mType == ASMIT_LDA && mIns[i + 2].mMode == ASMIM_ZERO_PAGE && mIns[i + 0].mAddress != mIns[i + 2].mAddress &&
mIns[i + 3].mType == ASMIT_SBC && mIns[i + 3].mMode == ASMIM_ZERO_PAGE && mIns[i + 0].mAddress == mIns[i + 3].mAddress && !(mIns[i + 3].mLive & LIVE_MEM))
{
mIns[i + 0].mType = ASMIT_EOR;
mIns[i + 0].mMode = ASMIM_IMMEDIATE;
mIns[i + 0].mAddress = 0xff;
mIns[i + 3].mType = ASMIT_ADC;
mIns[i + 3].mAddress = mIns[i + 2].mAddress;
mIns[i + 2].mType = ASMIT_NOP;
mIns[i + 2].mMode = ASMIM_IMPLIED;
progress = true;
}
#endif
#if 0
if (
mIns[i + 0].mType == ASMIT_LDY && mIns[i + 0].mMode == ASMIM_IMMEDIATE && mIns[i + 0].mAddress == 0 &&

2
oscar64/NativeCodeGenerator.h
View File

@ -68,6 +68,7 @@ public:
bool ChangesAccuAndFlag(void) const;
bool ChangesAddress(void) const;
bool ChangesAccu(void) const;
bool ChangesCarry(void) const;
bool RequiresAccu(void) const;
bool RequiresYReg(void) const;
bool ChangesYReg(void) const;
@ -158,6 +159,7 @@ public:
bool MoveLoadStoreUp(int at);
bool MoveIndirectLoadStoreUp(int at);
bool MoveAbsoluteLoadStoreUp(int at);
bool MoveLoadAddImmStoreUp(int at);
bool FindAddressSumY(int at, int reg, int & apos, int& breg, int& ireg);
bool FindGlobalAddress(int at, int reg, int& apos);
bool FindGlobalAddressSumY(int at, int reg, const NativeCodeInstruction * & ains, int& ireg);