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OP_STORE

Syntax and Stack

REG_VAL REG_NUM OP_STORE =>

  • REG_VAL: The stack item to be stored in the register
  • REG_NUM: The register number that the REG_VAL is stored in. Values outside of the range 0-31 will fail the script. REG_NUM must be a Script Num (not a big number).

Implementation

// get the top two stack items, the top is the register number, the 2nd from the top is to be the register value
int register_number = top stack item
StackItem register_value = 2nd to top stack item

// in the script machine there are only 32 registers (0-31)
// a register number higher than this a failure
if register_number > 31:
    script failure

// store the value in the register
arrRegisters.at(register_num) = register_value
// remove the top two stack items we just used from the stack
pop_the_stack()
pop_the_stack()

Script Example: 

push 10
push 5
OP_STORE # stores the value 10 into register #5

More Information

Read the document on Script Registers for more information about the uses and reasoning behind OP_LOAD.