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Constant folding of absolute pointer difference

This commit is contained in:
drmortalwombat 2025-05-15 07:58:58 +02:00
parent e514e05dc8
commit fe667863b2
1 changed files with 14 additions and 0 deletions
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14
oscar64/Declaration.cpp
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@ -1032,6 +1032,20 @@ Expression* Expression::ConstantFold(Errors * errors, LinkerSection * dataSectio
ex->mDecType = dec->mBase; ex->mDecType = dec->mBase;
return ex; return ex;
} }
else if (mLeft->mDecValue->mType == DT_CONST_ADDRESS && mRight->mDecValue->mType == DT_CONST_ADDRESS && mToken == TK_SUB)
{
if (mLeft->mDecType->mType == DT_TYPE_POINTER && mRight->mDecType->mType == DT_TYPE_POINTER &&
mLeft->mDecType->mBase->IsConstSame(mRight->mDecType->mBase))
{
Expression* ex = new Expression(mLocation, EX_CONSTANT);
Declaration* dec = new Declaration(mLocation, DT_CONST_INTEGER);
dec->mBase = TheSignedIntTypeDeclaration;
dec->mInteger = (mLeft->mDecValue->mInteger - mRight->mDecValue->mInteger) / mLeft->mDecType->mBase->mSize;
ex->mDecValue = dec;
ex->mDecType = dec->mBase;
return ex;
}
}
#if 0 #if 0
else if (mLeft->mDecValue->mType == DT_CONST_POINTER && mRight->mDecValue->mType == DT_CONST_INTEGER && (mToken == TK_ADD || mToken == TK_SUB)) else if (mLeft->mDecValue->mType == DT_CONST_POINTER && mRight->mDecValue->mType == DT_CONST_INTEGER && (mToken == TK_ADD || mToken == TK_SUB))
{ {