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A TCG "function" corresponds to a QEMU Translated Block (TB).

A TCG "temporary" is a variable only live in a given

A TCG "global" is a variable which is live in all the functions. They

are defined before the functions defined. A TCG global can be a memory

  information is used to suppress moves from a dead temporary to

  another one. It is also used to remove instructions which compute

  dead results. The later is especially useful for condition code

  In the following example:

  that some results of a computation are indeed not useful. With the

  macro system, the user can provide several alternative

  implementations which are used depending on the used results. It is

  Here is an example:

TCG is backward compatible with QEMU "dyngen" operations. It means

that TCG instructions can be freely mixed with dyngen operations. It

is expected that QEMU targets will be progressively fully converted to

to apply more optimizations because more registers will be free for

the generated code.