Useful Side Effect
Some processors, such as Intel x86 and the IBM/390, have a Load effective address instruction. This performs a calculation of the effective operand address, but instead of acting on that memory location, it loads the address that would have been accessed into a register. This can be useful when passing the address of an array element to a subroutine. It may also be a slightly sneaky way of doing more calculation than normal in one instruction; for example, using such an instruction with the addressing mode "base+index+offset" (detailed below) allows one to add two registers and a constant together in one instruction. the types of addressing modes are, 1.direct addressing, 2.Immediate addressing, 3.indirect addressing, 4.simple addressing.
Read more about this topic: Addressing Mode
Famous quotes containing the words side and/or effect:
“The inhabitants of earth behold commonly but the dark and shadowy under side of heaven’s pavement; it is only when seen at a favorable angle in the horizon, morning or evening, that some faint streaks of the rich lining of the clouds are revealed.”
—Henry David Thoreau (1817–1862)
“The pleasure of one’s effect on other people still exists in age—what’s called making a hit. But the hit is much rarer and made of different stuff.”
—Enid Bagnold (1889–1981)