Re: [patch] tree-ssa-forwprop.c: Rewrite.

[Devang Patel <dpatel at apple dot com>]

On Apr 12, 2005, at 11:59 AM, Kazu Hirata wrote:

> I am thinking about detecting common
> combinable cases like two successive casts and whatnot and let fold do
> its job.
>
> My main goal is to reduce the number of statements as quickly as
> possible so that the time used to combine statements is offset by
> reduced time in other optimizers.  Also, eliminating successive casts
> often expose copy statements of the form "SSA_NAME = SSA_NAME;", which
> I am sure other optimizers would love to pick up and take advantage
> of.

It'd increase number of vectorization candidate loops by eliminating
casts. Until tree combiner is available, we are using a simple hack
to eliminate casts, see eliminate_unncessary_casts() in autovect-branch.

-
Devang