Messages in this thread | | | Date | Tue, 11 Mar 2003 10:36:49 -0500 | From | Daniel Jacobowitz <> | Subject | Re: reducing stack usage in v4l? |
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On Tue, Mar 11, 2003 at 04:29:30PM +0000, Alan Cox wrote: > On Tue, 2003-03-11 at 09:19, Gerd Knorr wrote > > > That is wrong, at least the 2k memset/call mentioned by Andrew. There > > are lots of memset() calls, but they all are within the case switches > > for the ioctls and zero out only the structs which are used in that code > > path, so it is actually much smaller (~50 -> ~300 bytes maybe, depending > > on the ioctl). > > gcc sometimes does things like allocate all the objects in case > statements at entry time. I assume its a performance win to do so.
No, it's more likely a known GCC bug to do so. See PR middle-end/9997 if you're really curious.
-- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer - 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/
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