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

Optimize 8bit add and pointer access

This commit is contained in:
drmortalwombat 2023-03-15 17:58:49 +01:00
parent 66d17d6df4
commit 485282019b
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
oscar64/NativeCodeGenerator.cpp
View File

@ -35601,6 +35601,30 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
}
}
if (i + 8 < mIns.Size() && pass > 3 &&
mIns[i + 0].mType == ASMIT_LDA &&
mIns[i + 1].mType == ASMIT_CLC &&
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 + 4].mType == ASMIT_LDA &&
mIns[i + 5].mType == ASMIT_ADC && mIns[i + 5].mMode == ASMIM_IMMEDIATE &&
mIns[i + 6].mType == ASMIT_STA && mIns[i + 6].mMode == ASMIM_ZERO_PAGE && mIns[i + 6].mAddress == mIns[i + 3].mAddress + 1 &&
mIns[i + 7].mType == ASMIT_LDY && mIns[i + 7].mMode == ASMIM_IMMEDIATE &&
mIns[i + 8].mMode == ASMIM_INDIRECT_Y && mIns[i + 8].mAddress == mIns[i + 3].mAddress && !(mIns[i + 8].mLive & LIVE_MEM))
{
int total = mIns[i + 2].mAddress + mIns[i + 7].mAddress + 256 * mIns[i + 5].mAddress;
if (!(mIns[i + 8].mLive & LIVE_CPU_REG_Y) || !(mIns[i + 8].mLive & LIVE_CPU_REG_Z))
{
if (mIns[i + 8].mLive & LIVE_CPU_REG_Y)
mIns.Insert(i + 9, NativeCodeInstruction(ASMIT_LDY, ASMIM_IMMEDIATE, mIns[i + 7].mAddress));
mIns[i + 7].mAddress = total & 255;
mIns[i + 5].mAddress = total >> 8;
mIns[i + 2].mType = ASMIT_NOP; mIns[i + 2].mMode = ASMIM_IMPLIED;
changed = true;
}
}
if (i + 6 < mIns.Size())
{
if (