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Shortcut known branch cascades

This commit is contained in:
drmortalwombat 2025-02-17 13:12:28 +01:00
parent 9f7d4c0ab0
commit 25ee4e9b2b
2 changed files with 110 additions and 0 deletions
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105
oscar64/InterCode.cpp
View File

@ -15379,6 +15379,96 @@ InterCodeBasicBlock* InterCodeBasicBlock::CheckIsConstBranch(const GrowingInstru
return nullptr;
}
bool InterCodeBasicBlock::ChangeTrueJump(InterCodeBasicBlock* block)
{
if (block != mTrueJump)
{
mTrueJump->mEntryBlocks.RemoveAll(this);
mTrueJump->mNumEntries--;
block->mEntryBlocks.Push(this);
block->mNumEntries++;
mTrueJump = block;
return true;
}
return false;
}
bool InterCodeBasicBlock::ChangeFalseJump(InterCodeBasicBlock* block)
{
if (block != mFalseJump)
{
mFalseJump->mEntryBlocks.RemoveAll(this);
mFalseJump->mNumEntries--;
block->mEntryBlocks.Push(this);
block->mNumEntries++;
mFalseJump = block;
return true;
}
return false;
}
bool InterCodeBasicBlock::ShortcutDuplicateBranches(void)
{
bool changed = false;
if (!mVisited)
{
mVisited = true;
int sz = mInstructions.Size();
if (sz >= 2 && mInstructions[sz - 1]->mCode == IC_BRANCH && mInstructions[sz - 2]->mCode == IC_RELATIONAL_OPERATOR && mInstructions[sz - 1]->mSrc[0].mTemp == mInstructions[sz - 2]->mDst.mTemp)
{
InterInstruction* cins = mInstructions[sz - 2];
if (mTrueJump->mInstructions.Size() == 2 && mTrueJump->mInstructions[0]->mCode == IC_RELATIONAL_OPERATOR && mTrueJump->mInstructions[1]->mCode == IC_BRANCH && mTrueJump->mInstructions[0]->mDst.mTemp == mTrueJump->mInstructions[1]->mSrc[0].mTemp)
{
InterInstruction* tcins = mTrueJump->mInstructions[0];
if (cins->mSrc[0].IsEqual(tcins->mSrc[0]) && cins->mSrc[1].IsEqual(tcins->mSrc[1]))
{
if (cins->mOperator == tcins->mOperator)
{
if (ChangeTrueJump(mTrueJump->mTrueJump))
changed = true;
}
else if (cins->mOperator == InvertRelational(tcins->mOperator))
{
if (ChangeTrueJump(mTrueJump->mFalseJump))
changed = true;
}
}
}
if (mFalseJump->mInstructions.Size() == 2 && mFalseJump->mInstructions[0]->mCode == IC_RELATIONAL_OPERATOR && mFalseJump->mInstructions[1]->mCode == IC_BRANCH && mFalseJump->mInstructions[0]->mDst.mTemp == mFalseJump->mInstructions[1]->mSrc[0].mTemp)
{
InterInstruction* tcins = mFalseJump->mInstructions[0];
if (cins->mSrc[0].IsEqual(tcins->mSrc[0]) && cins->mSrc[1].IsEqual(tcins->mSrc[1]))
{
if (cins->mOperator == tcins->mOperator)
{
if (ChangeFalseJump(mFalseJump->mFalseJump))
changed = true;
}
else if (cins->mOperator == InvertRelational(tcins->mOperator))
{
if (ChangeFalseJump(mFalseJump->mTrueJump))
changed = true;
}
}
}
}
if (mTrueJump && mTrueJump->ShortcutDuplicateBranches())
changed = true;
if (mFalseJump && mFalseJump->ShortcutDuplicateBranches())
changed = true;
}
return changed;
}
bool InterCodeBasicBlock::ShortcutConstBranches(const GrowingInstructionPtrArray& cins)
{
bool changed = false;
@ -22508,6 +22598,19 @@ void InterCodeProcedure::ShortcutConstBranches(void)
Disassemble("ShortcutConstBranches");
}
void InterCodeProcedure::ShortcutDuplicateBranches(void)
{
BuildDataFlowSets();
TempForwarding();
RemoveUnusedInstructions();
do {
ResetVisited();
} while (mEntryBlock->ShortcutDuplicateBranches());
Disassemble("ShortcutDuplicateBranches");
}
void InterCodeProcedure::MoveConditionsOutOfLoop(void)
{
@ -24045,6 +24148,8 @@ void InterCodeProcedure::Close(void)
ShortcutConstBranches();
ShortcutDuplicateBranches();
DisassembleDebug("Global Constant Prop 1");
BuildDataFlowSets();

5
oscar64/InterCode.h
View File

@ -648,8 +648,12 @@ public:
bool SingleTailLoopOptimization(const NumberSet& aliasedParams, const GrowingVariableArray& staticVars);
bool MergeLoopTails(void);
bool ChangeTrueJump(InterCodeBasicBlock* block);
bool ChangeFalseJump(InterCodeBasicBlock* block);
InterCodeBasicBlock* CheckIsConstBranch(const GrowingInstructionPtrArray& cins);
bool ShortcutConstBranches(const GrowingInstructionPtrArray& cins);
bool ShortcutDuplicateBranches(void);
InterCodeBasicBlock* BuildLoopPrefix(void);
void BuildLoopSuffix(void);
@ -802,6 +806,7 @@ protected:
void PropagateMemoryAliasingInfo(void);
void MoveConditionsOutOfLoop(void);
void ShortcutConstBranches(void);
void ShortcutDuplicateBranches(void);
void EliminateDoubleLoopCounter(void);
void StructReturnPropagation(void);