[Bug middle-end/30075] Missed optimizations with -fwhole-program -combine

["acahalan at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #4 from acahalan at gmail dot com  2007-06-26 03:10 -------
(In reply to comment #3)
> Subject: Re:  Missed optimizations with -fwhole-program -combine
> 
> I would not expect this to be fixed anytime soon.  I have yet to find
> any real people who use either combine or -fwhole-program.  They use
> *way* too much memory on real programs.  As a result, no real people
> involved in optimization work on optimizers for them.

I'm real, and I want to use those.

I can't use them because of bug #29171. They appear to be 100% unusable for
non-trivial programs because gcc WILL emit calls to memcpy and there isn't any
possible (documented at least) way to provide a memcpy. No matter how I
__attribute__ my memcpy, and no matter if I use -ffreestanding or not, gcc
wants to call an extern memcpy. Linking against a libc is against the
documented requirements for using these options.


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acahalan at gmail dot com changed:

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                 CC|                            |acahalan at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30075