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Re: Small object optimizations

From: Richard Henderson <rth at redhat dot com>
To: Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 10 Oct 2002 10:21:23 -0700
Subject: Re: Small object optimizations
References: <Pine.LNX.4.33.0210101102411.19532-100000@bellatrix.tat.physik.uni-tuebingen.de>

On Thu, Oct 10, 2002 at 11:15:47AM +0200, Richard Guenther wrote:
> For decent C++ performance wrt abstraction of small objects g++ lacks
> optimization regarding to optimizing away memory bindings to such objects
> like in:
> 
> struct simple {
>  simple& operator+(int k) { i+=k; j+=k; return *this; }
>  int i, j
> };

Currently we can only optimize this if the object is smaller
than the word size on the machine.  The tree-ssa branch optimizations
will be able to address this generically.

r~

References:
- Small object optimizations
  - From: Richard Guenther

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