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BMC: push negation into conjunction #793

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BMC: push negation into conjunction #793

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19 changes: 17 additions & 2 deletions src/ebmc/bmc.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,15 @@ Author: Daniel Kroening, dkr@amazon.com
#include <chrono>
#include <fstream>

static exprt::operandst vector_negation(const exprt::operandst &src)
{
exprt::operandst result;
result.reserve(src.size());
for(auto &expr : src)
result.push_back(not_exprt{expr});
return result;
}

void bmc(
std::size_t bound,
bool convert_only,
Expand Down Expand Up @@ -79,7 +88,11 @@ void bmc(
for(const auto &property : properties.properties)
{
if(!property.is_disabled())
solver.set_to_false(conjunction(property.timeframe_handles));
{
// one of them must be false
solver.set_to_true(
disjunction(vector_negation((property.timeframe_handles))));
}
}

// Call decision_proceduret::dec_solve to finish the conversion
Expand All @@ -106,7 +119,9 @@ void bmc(

message.status() << "Checking " << property.name << messaget::eom;

auto assumption = not_exprt{conjunction(property.timeframe_handles)};
// one of them must be false
auto assumption =
disjunction(vector_negation(property.timeframe_handles));

decision_proceduret::resultt dec_result = solver(assumption);

Expand Down
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