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Re: [tree-ssa] [PATCH]: Turn SSAPRE on by default

From: Daniel Berlin <dberlin at dberlin dot org>
To: Diego Novillo <dnovillo at redhat dot com>
Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Sat, 30 Aug 2003 00:15:26 -0400
Subject: Re: [tree-ssa] [PATCH]: Turn SSAPRE on by default
References: <68A0404E-DA30-11D7-A19A-000A95A34564@dberlin.org> <1062198987.19264.5.camel@frodo.toronto.redhat.com>

On Aug 29, 2003, at 7:16 PM, Diego Novillo wrote:

On Fri, 2003-08-29 at 10:52, Daniel Berlin wrote:
Diego, OK?
2003-08-28  Daniel Berlin  <dberlin@dberlin.org>
     * opts.c (decode_options): Turn on SSAPRE by default.
Sure. We need to experiment with the ordering now.

Committed.

I'm aware of a problem with speed in checking mode on expressions with large numbers of occurrences (or ephis) that i'm bootstrapping a fix for now. I was regenerating a list using an O(n^2) algorithm in 4 places i didn't actually need to. This resulted in a couple hundred million calls to bb_for_stmt, which itself calls is_gimple_stmt and is_essa_node. :)

Diego.

References:
- [tree-ssa] [PATCH]: Turn SSAPRE on by default
  - From: Daniel Berlin
- Re: [tree-ssa] [PATCH]: Turn SSAPRE on by default
  - From: Diego Novillo

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