johan.adolfsson@axis.com writes:
>Shouldn't a compiler be able to deal with this instead?
Yes. I sent some email to bug-gcc about this a couple of
months ago and even posted some (probably horribly incorrect) code
showing roughly the change I had in mind in the gcc source code
for the simple case of scalar variables. I was told that some code
to this was put in and then removed from gcc a long time ago, and
nobody seemed interested in putting it back in. I would think that this
would be a basic optimization that I would expect the compiler to make,
just like deleting "if(0) {......}" code, but gcc does not currently
do that. If somebody would like to fix gcc and do the necessary
lobbying to get such a change integrated, that would be great. However,
until that actually happens, I hope the file that I posted to
ftp://ftp.yggdrasil.com/private/adam/linux/zerovars/ will be useful
to individual maintainers and in identifying the largest arrays of
zeroes that can fix fixed in a few lines.
Adam J. Richter __ ______________ 4880 Stevens Creek Blvd, Suite 104
adam@yggdrasil.com \ / San Jose, California 95129-1034
+1 408 261-6630 | g g d r a s i l United States of America
fax +1 408 261-6631 "Free Software For The Rest Of Us."
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Apr 15 2001 - 21:00:19 EST