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List:       gcc
Subject:    Re: replacing the VRP threader
From:       Aldy Hernandez via Gcc <gcc () gcc ! gnu ! org>
Date:       2021-09-22 7:53:26
Message-ID: CAGm3qMUtzeMFStAD3vhfj64sp36bHHr6N9sybkHQkOhPTTqWwQ () mail ! gmail ! com
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On Tue, Sep 21, 2021 at 12:48 PM Aldy Hernandez <aldyh@redhat.com> wrote:

> SUMMARY
> =======
>
> The hybrid threader gets 14.5% more jump threads than the legacy code,
> but most of these threads are at the expense of other threading passes.
> The more it gets, the less DOM and the backward threader get.  That
> being said, there is a total improvement of 0.87% jump threads in the
> total compilation.

Well, it turns out we're considerably better than reported.

Andrew just found a one-line change in the path solver that improves
our VRP threading goodness to 18.5% and our overall jump threading
gains to 1.28%.

Yay!
Aldy

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