1. One of a small number of high-speed memory locations in a computer' s ref="module.php?name=Lexikon&file=search&eid=1&query=CPU">CPU. Registers differ from ordinary ref="module.php?name=Lexikon&file=search&eid=1&query=random access memory">random access memory in several respects: There are only a small number of registers (the "register set"), typically 32 in a modern processor though some, e.g. ref="module.php?name=Lexikon&file=search&eid=1&query=SPARC">SPARC, have as many as 144. A register may be directly addressed with a few bits. In contrast, there are usually millions of words of main memory (RAM), requiring at least twenty bits to specify a memory location. Main memory locations are often specified indirectly, using an {indirect addressing} mode where the actual memory address is held in a register. Registers are fast typically, two registers can be read and a third written -- all in a single cycle. Memory is slower a single access can require several cycles. The limited size and high speed of the register set makes it one of the critical resources in most computer architectures. ref="module.php?name=Lexikon&file=search&eid=1&query=Register allocation">Register allocation, typically one phase of the ref="module.php?name=Lexikon&file=search&eid=1&query=back-end">back-end, controls the use of registers by a compiled program. See also ref="module.php?name=Lexikon&file=search&eid=1&query=accumulator">accumulator, ref="module.php?name=Lexikon&file=search&eid=1&query=FUBAR">FUBAR, ref="module.php?name=Lexikon&file=search&eid=1&query=orthogonal">orthogonal, {register dancing}, {register allocation}, {register spilling}. 2. An addressable location in a ref="module.php?name=Lexikon&file=search&eid=1&query=memory-mapped">memory-mapped peripheral device. E.g. the transmit data register in a ref="module.php?name=Lexikon&file=search&eid=1&query=UART">UART.

In addition suitable contents:
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