gas.cpp

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#include "barretenberg/vm2/common/gas.hpp"
 
#include <cstddef>
 
#include "barretenberg/aztec/aztec_constants.hpp"
#include "barretenberg/vm2/common/addressing.hpp"
 
namespace bb::avm2 {
 
uint16_t compute_addressing_gas(uint16_t addressing_mode)
{
    // Check that the addressing gas cost fits in 16 bits.
    static_assert(AVM_MAX_OPERANDS * (AVM_ADDRESSING_INDIRECT_L2_GAS + AVM_ADDRESSING_RELATIVE_L2_GAS) +
                          AVM_ADDRESSING_BASE_RESOLUTION_L2_GAS <=
                      UINT16_MAX,
                  "Addressing gas cost must fit in 16 bits");
 
    uint16_t indirect_operand_count = 0;
    uint16_t relative_operand_count = 0;
 
    for (size_t i = 0; i < AVM_MAX_OPERANDS; i++) {
        if (is_operand_indirect(addressing_mode, i)) {
            indirect_operand_count++;
        }
        if (is_operand_relative(addressing_mode, i)) {
            relative_operand_count++;
        }
    }
 
    return static_cast<uint16_t>((relative_operand_count != 0 ? AVM_ADDRESSING_BASE_RESOLUTION_L2_GAS : 0) +
                                 (indirect_operand_count * AVM_ADDRESSING_INDIRECT_L2_GAS) +
                                 (relative_operand_count * AVM_ADDRESSING_RELATIVE_L2_GAS));
}
 
} // namespace bb::avm2