[tree-ssa] Copy propagation [patch]

[Michael Matz]

Hi,

On Fri, 28 Feb 2003 law@redhat.com wrote:

>  >You can cut down the copies during SSA form building, but we would still
>  >need this as a separate pass to cleanup the garbage that PRE (and later
>  >on GVN and VRP) may leave behind.
> Those would be wiped by the register coalescing that should be done as
> part of the translation from SSA back to normal form.

It could arguably also be left to the register allocator.


Ciao,
Michael.