The advantage of doing it before register allocation is that this results in maximum parallelism.

This is performed in tandem with register allocation to avoid spills.

Register allocation assigns processor registers for the program variables where possible.

Many optimizations listed in other sections also benefit with no special changes, such as register allocation.

It also does some simple register allocation, which prevents many extraneous save/load pairs inside a single statement.

Register allocation of this loop body runs into the problem that the result of must stay live for two iterations.

It was extension of an earlier 1981 paper on the use of graph coloring for register allocation.

Ershov numbers are used in code optimization to minimize the amount of register allocations.

"Register allocation in a pattern matching code generator."

The distinction is important when designing machine code generator software for the purposes of register allocation and live range tracking.

As graph coloring in general is NP-complete, so is register allocation.

It does not provide register allocation, data-flow or control-flow analysis, or optimization.

And then there's that automatic register allocation...

Instruction scheduling may be done either before or after register allocation or both before and after it.

The possibility of doing register allocation on SSA-form programs is a focus of recent research.

SSA form is only eliminated once register allocation occurs, late in the compile process (often at link time).

One of the major applications of graph coloring, register allocation in compilers, was introduced in 1981.

Register allocation In economics:

This register allocation is either performed by a compiler, in the code generation phase, or manually, by an assembly language programmer.

It is typically tightly integrated with register allocation, where it is used as an alternative to spilling registers to memory.

Chaitin is also the originator of using graph coloring to do register allocation in compiling, a process known as Chaitin's algorithm.

In cases of dynamic compilation, such as just-in-time (JIT) compilers, fast register allocation is important.

Chaitin's algorithm is a bottom-up, graph coloring register allocation algorithm that uses cost/degree as its spill metric.

Popular optimizations are inline expansion, dead code elimination, constant propagation, loop transformation, register allocation and even automatic parallelization.

In 1981, the compiler was extensively redone to add optimization, such as register allocation, boolean to jump, dead code, constant folding, and other optimizations.