this is, if I remember correctly, is to cut down compile time for the
degenerated case: x = x+x; repeated n times
Sun
On Fri, Oct 21, 2011 at 3:05 PM, Jian-Xin Lai <laij...@gmail.com> wrote:
> Hi,
>
> I found some code in opt_prop.cxx relies on the CODEREP::Usecnt() to enable
> or disable copy propagation for cse:
> inside_cse = inside_cse || x->Usecnt() > 1;
>
> This means the copy propagation are always disabled for ILOAD with mu to
> default vsym if the Usecnt() is more than 1.
> But I guess the usecnt of a coderep is not always corrent. Can the copy
> propagation rely on this number?
>
> --
> Regards,
> Lai Jian-Xin
>
>
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