[Bug middle-end/19410] Overlapping memcpy with big struct copies (ACATS c64106a)

[baldrick at free dot fr]

------- Additional Comments From baldrick at free dot fr  2005-01-13 10:47 -------
Subject: Re:  Overlapping memcpy with big struct copies (ACATS c64106a)

> > Would you like me to file a separate report for them?  Here is cxa4009 by the way:
> 
> Yes please because this is a related issue but I think it might be an Ada front-end bug rather than what 
> C64106A is which is a middle-end one as shown by the C example.

I filed a separate bug report for CXA4009 and CXA4020: [Bug ada/19419].

By the way, I've tried to imagine how a memcpy with source==target can cause problems, without much
success.  Any hints? :)  The only thing I could come up with was: if there are two copies of the
same bit of memory (eg: one in cache, the other in main memory; or one in backing store, one in memory),
with one copy being out of date; and the memcpy causing the out-of-date one to be written on top of the
up-to-date one somehow...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19410