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Why do uvm_reg::read() and uvm_reg::mirror compare against m_desired?

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uvm_reg::read() and uvm_reg::mirror() can compare the value read from the register with the expected value. Apparently this is used with implicit prediction.

However, they both use uvm_reg_field::get() for the expected value, which gets m_desired, not m_mirrored. I would expect the comparison to be made against m_mirrored.

uvm_reg_predictor uses uvm_reg_field::get_mirrored_value() for the expected value when it does a comparison after read.

Is there a reason for the difference?

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