[Bug middle-end/21840] [4.1 Regression] Linux 2.6.11.1.11: drivers/char/keyboard.c:619: internal compiler error: Segmentation fault

["dberlin at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From dberlin at gcc dot gnu dot org  2005-05-31 15:28 -------
Not really an FRE bug.
FRE eliminates the load, and everything we have tells it it can (it asks
may_propagate_copy, etc).

However, eliminating the load replaces a void (*foo) type with a void * type (IE
poitner to function replaced with pointer to void).

Once FRE has eliminated the load, something later copy-props the void * func_4
into the call and then it gets transforms it into a void.
So we end up with a call of a void expression, which makes things angry.
I can't fix this in FRE, it's not doing anything wrong, it's just removing a
load, validly :)

Whatever is copy-prop'ing into the call and transforming it into a call of a
void is wrong, and that's not FRE.





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           What    |Removed                     |Added
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                 CC|                            |dnovillo at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21840