Register update method

A method for updating registers, comprising following steps:

• providing one or more bitmap registers;
• providing one or more target registers;
• establishing a mapping between each bit in the one or more bitmap registers and a corresponding target content block in the one or more target registers;
• providing a register update instruction, the register update instruction comprising:
• one or more flag bits at specified locations, wherein each flag bit corresponds to a bit in the one or more bitmap registers, indicating whether the target content block corresponding to the bit needs to be updated;
• wherein, for each target content block indicated by the bit that needs to be updated, the register update instruction further comprises a new content of the target content block or a source of the new content;
• writing the one or more flag bits in the register update instruction into the one or more bitmap registers;
• and
• executing the register update instruction by an update controller according to the bit in the one or more bitmap registers to update the target content block in the one or more target registers, wherein only each target content block that needs to be updated as indicated by the bit is updated.