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Reduce branches in short basic block sequences

This commit is contained in:
drmortalwombat 2024-10-15 07:37:35 +02:00
parent ebc41560d9
commit ea33f253d4
2 changed files with 27 additions and 13 deletions
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37
oscar64/NativeCodeGenerator.cpp
View File

@ -631,8 +631,7 @@ bool NativeCodeInstruction::IsUsedResultInstructions(NumberSet& requiredTemps)
#if 1
if (mFlags & NCIF_USE_CPU_REG_A)
requiredTemps += CPU_REG_A;
if (mFlags & NCIF_LOWER)
else if (mFlags & NCIF_LOWER)
{
requiredTemps += BC_REG_ACCU;
if (mFlags & NCIF_UPPER)
@ -40318,7 +40317,10 @@ bool NativeCodeBasicBlock::OptimizeGenericLoop(NativeCodeProcedure* proc)
break;
case ASMIT_TYA:
if (yoffset)
{
yreg = -2;
areg = -2;
}
else if ((areg == -1 || areg == CPU_REG_Y) && !(ins.mLive & LIVE_CPU_REG_Z))
areg = CPU_REG_Y;
else
@ -40326,7 +40328,10 @@ bool NativeCodeBasicBlock::OptimizeGenericLoop(NativeCodeProcedure* proc)
break;
case ASMIT_TXA:
if (xoffset)
{
xreg = -2;
areg = -2;
}
else if ((areg == -1 || areg == CPU_REG_X) && !(ins.mLive & LIVE_CPU_REG_Z))
areg = CPU_REG_X;
else
@ -50846,6 +50851,19 @@ int NativeCodeBasicBlock::LeadsInto(NativeCodeBasicBlock* block, int dist)
return 1000;
}
NativeCodeBasicBlock * NativeCodeBasicBlock::PlaceSequence(ExpandingArray<NativeCodeBasicBlock*>& placement, NativeCodeBasicBlock* block)
{
int size = 0;
do {
block->mPlaced = true;
block->mPlace = placement.Size();
placement.Push(block);
size += block->mCode.Size();
block = block->mTrueJump;
} while (block && !block->mFalseJump && !block->mPlaced && size + block->mCode.Size() < 32);
return block;
}
void NativeCodeBasicBlock::BuildPlacement(ExpandingArray<NativeCodeBasicBlock*>& placement)
{
if (!mPlaced)
@ -50924,19 +50942,15 @@ void NativeCodeBasicBlock::BuildPlacement(ExpandingArray<NativeCodeBasicBlock*>&
}
else if (!mTrueJump->mFalseJump && mTrueJump->mTrueJump && mTrueJump->mCode.Size() < 100 && mFalseJump->LeadsInto(mTrueJump->mTrueJump, 0) < 100)
{
mTrueJump->mPlaced = true;
mTrueJump->mPlace = placement.Size();
placement.Push(mTrueJump);
NativeCodeBasicBlock * xblock = PlaceSequence(placement, mTrueJump);
mFalseJump->BuildPlacement(placement);
if (xblock) xblock->BuildPlacement(placement);
}
else if (!mFalseJump->mFalseJump && mFalseJump->mTrueJump && mFalseJump->mCode.Size() < 100 && mTrueJump->LeadsInto(mFalseJump->mTrueJump, 0) < 100)
{
mFalseJump->mPlaced = true;
mFalseJump->mPlace = placement.Size();
placement.Push(mFalseJump);
NativeCodeBasicBlock * xblock = PlaceSequence(placement, mFalseJump);
mTrueJump->BuildPlacement(placement);
if (xblock) xblock->BuildPlacement(placement);
}
else if (mTrueJump->mIns.Size() == 0 && mTrueJump->mFalseJump == mFalseJump->mFalseJump && mTrueJump->mTrueJump == mFalseJump->mTrueJump)
{
@ -51492,7 +51506,7 @@ void NativeCodeProcedure::Compile(InterCodeProcedure* proc)
mInterProc = proc;
mInterProc->mLinkerObject->mNativeProc = this;
CheckFunc = !strcmp(mInterProc->mIdent->mString, "fighter_input");
CheckFunc = !strcmp(mInterProc->mIdent->mString, "room_check_wall");
int nblocks = proc->mBlocks.Size();
tblocks = new NativeCodeBasicBlock * [nblocks];
@ -52684,7 +52698,6 @@ void NativeCodeProcedure::Optimize(void)
if (!changed && mEntryBlock->LoopRegisterXYMap())
changed = true;
#endif
ResetVisited();
if (!changed && mEntryBlock->OptimizeGenericLoop(this))
changed = true;

1
oscar64/NativeCodeGenerator.h
View File

@ -274,6 +274,7 @@ public:
NativeCodeBasicBlock* BypassEmptyBlocks(void);
int LeadsInto(NativeCodeBasicBlock* block, int dist);
NativeCodeBasicBlock* PlaceSequence(ExpandingArray<NativeCodeBasicBlock*>& placement, NativeCodeBasicBlock* block);
void BuildPlacement(ExpandingArray<NativeCodeBasicBlock*>& placement);
void InitialOffset(int& total);
bool CalculateOffset(int& total);