Messages in this thread | | | From | "Adam J. Richter" <> | Date | Thu, 12 Apr 2001 12:01:55 -0700 | Subject | Re: List of all-zero .data variables in linux-2.4.3 available |
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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.
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