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detect small integer not equal (#572)

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This commit is contained in:
water111
2021-06-08 23:39:01 -04:00
committed by GitHub
parent 5b24e43143
commit 12d72c7897
2 changed files with 18 additions and 11 deletions
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decompiler/IR2/FormExpressionAnalysis.cpp
+13 -2
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@@ -2614,9 +2614,20 @@ FormElement* ConditionElement::make_nonzero_check_generic(const Env& env,
if (bitfield_compare) {
return bitfield_compare;
} else {
return pool.alloc_element<GenericElement>(GenericOperator::make_compare(m_kind), source_forms);
}
auto mr = match(Matcher::op(GenericOpMatcher::fixed(FixedOperatorKind::ADDITION),
{Matcher::any(0), Matcher::any_integer(1)}),
source_forms.at(0));
if (mr.matched) {
s64 value = -mr.maps.ints.at(1);
auto value_form = pool.alloc_single_element_form<SimpleAtomElement>(
nullptr, SimpleAtom::make_int_constant(value));
return pool.alloc_element<GenericElement>(GenericOperator::make_fixed(FixedOperatorKind::NEQ),
std::vector<Form*>{mr.maps.forms.at(0), value_form});
}
return pool.alloc_element<GenericElement>(GenericOperator::make_compare(m_kind), source_forms);
}
FormElement* ConditionElement::make_equal_check_generic(const Env& env,