[Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory

[bonzini at 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