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[Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
- From: "bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 6 Oct 2003 08:01:59 -0000
- Subject: [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
- References: <20030926105501.12419.aph@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419
------- Additional Comments From bonzini at gnu dot org 2003-10-06 08:01 -------
This patch
http://gcc.gnu.org/ml/gcc-patches/2003-02/msg01655.html
was reviewed by rth who suggested an alternative approach:
http://gcc.gnu.org/ml/gcc-patches/2003-04/msg00482.html
> As for Zdenek's proposed prepass patch... I think it would be
> better to not iterate over the entire instruction stream twice.
> We could, for instance, change the return value of purge_addressof_1
> to be three-state, with the new return location indicating that
> we should re-process this insn at the end.
Paolo