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Re: GCSE memory usage
- To: Mark Mitchell <mark at codesourcery dot com>
- Subject: Re: GCSE memory usage
- From: Richard Henderson <rth at cygnus dot com>
- Date: Sun, 24 Oct 1999 20:49:47 -0700
- Cc: gcc at gcc dot gnu dot org
- References: <19991024193439I.mitchell@codesourcery.com>
On Sun, Oct 24, 1999 at 07:34:39PM -0700, Mark Mitchell wrote:
> Any objections? I'm also willing to code this conditionally in some
> way, if people really think the use of ordinary bitmaps, rather than
> sbitmaps, will slow down the smaller cases substantially.
I would be curious to know what kind of performance impact this has
on say, a bootstrap of the compiler, but I also think this isn't the
best solution.
I think that expression-at-a-time gcse is the way to go. In that
case we don't need <regs>x<blocks> bits at once, just <blocks>.
Plus, as Jeff alluded to, it's required for some more interesting
global optimizations that we don't do at present.
r~