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Fix right + left shift optimization when shifting from long to int

This commit is contained in:
drmortalwombat 2023-01-13 15:41:21 +01:00
parent 7c11a5347c
commit fdb051bd2b
1 changed files with 43 additions and 34 deletions
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77
oscar64/InterCode.cpp
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@ -12180,43 +12180,52 @@ void InterCodeBasicBlock::PeepholeOptimization(const GrowingVariableArray& stati
{
int shift = mInstructions[i + 0]->mSrc[0].mIntConst;
int mshift = mInstructions[i + 1]->mSrc[0].mIntConst;
mInstructions[i + 0]->mOperator = IA_AND;
mInstructions[i + 0]->mSrc[0].mType = IT_INT16;
mInstructions[i + 0]->mSrc[0].mType = mInstructions[i + 1]->mSrc[0].mType;
switch (mInstructions[i + 0]->mSrc[0].mType)
if (shift & 7)
{
case IT_INT8:
mInstructions[i + 0]->mSrc[0].mIntConst = (0xffu >> shift) << shift;
break;
case IT_INT16:
mInstructions[i + 0]->mSrc[0].mIntConst = (0xffffu >> shift) << shift;
break;
case IT_INT32:
mInstructions[i + 0]->mSrc[0].mIntConst = (0xffffffffu >> shift) << shift;
break;
}
int mshift = mInstructions[i + 1]->mSrc[0].mIntConst;
if (shift > mshift)
{
mInstructions[i + 1]->mOperator = IA_SHR;
mInstructions[i + 1]->mSrc[0].mIntConst = shift - mshift;
}
else if (shift < mshift)
{
mInstructions[i + 1]->mOperator = IA_SHL;
mInstructions[i + 1]->mSrc[0].mIntConst = mshift - shift;
}
else
{
mInstructions[i + 0]->mDst = mInstructions[i + 1]->mDst;
mInstructions[i + 1]->mCode = IC_NONE;
mInstructions[i + 1]->mNumOperands = 0;
}
mInstructions[i + 0]->mOperator = IA_AND;
mInstructions[i + 0]->mSrc[0].mType = IT_INT16;
mInstructions[i + 0]->mSrc[0].mType = mInstructions[i + 1]->mSrc[0].mType;
changed = true;
switch (mInstructions[i + 0]->mSrc[1].mType)
{
case IT_INT8:
mInstructions[i + 0]->mSrc[0].mIntConst = (0xffu >> shift) << shift;
break;
case IT_INT16:
mInstructions[i + 0]->mSrc[0].mIntConst = (0xffffu >> shift) << shift;
break;
case IT_INT32:
mInstructions[i + 0]->mSrc[0].mIntConst = (0xffffffffu >> shift) << shift;
break;
}
if (shift > mshift && mInstructions[i + 0]->mDst.mType > mInstructions[i + 1]->mSrc[1].mType)
{
mInstructions[i + 1]->mSrc[1].mType = mInstructions[i + 0]->mDst.mType;
mInstructions[i + 1]->mDst.mType = mInstructions[i + 0]->mDst.mType;
}
if (shift > mshift)
{
mInstructions[i + 1]->mOperator = IA_SHR;
mInstructions[i + 1]->mSrc[0].mIntConst = shift - mshift;
}
else if (shift < mshift)
{
mInstructions[i + 1]->mOperator = IA_SHL;
mInstructions[i + 1]->mSrc[0].mIntConst = mshift - shift;
}
else
{
mInstructions[i + 0]->mDst = mInstructions[i + 1]->mDst;
mInstructions[i + 1]->mCode = IC_NONE;
mInstructions[i + 1]->mNumOperands = 0;
}
changed = true;
}
}
#endif
#if 1