Re: New optimization for reload_combine

[Bernd Schmidt <bernds at codesourcery dot com>]

On 07/20/2010 01:45 PM, Bernd Schmidt wrote:
> It's still producing different code for -g vs. no-debug on powerpc.  It
> turns out that we only store a limited amount of uses for a reg, and
> somehow the powerpc compiler produces a huge amount of debug_insns,
> which fill the buffer and prevent us from doing the optimization on real
> insns.
> 
> Not sure yet how to fix it, probably by not tracking DEBUG_INSNs at all
> and letting them get out of date.

Here's a fix, which I've committed.  Bootstrapped and regression tested
on i686-linux, and also verified that I can no longer reproduce output
differences with a powerpc cross compiler.  It even tries to fix up the
debug insns in the range of insns we're changing so that should be OK too.


Bernd

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