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Re: [Bug-zile] Incremental search is dog slow in moderately-sized files

From: Gary V. Vaughan
Subject: Re: [Bug-zile] Incremental search is dog slow in moderately-sized files
Date: Tue, 21 Jan 2014 12:07:08 +1300

Hi Reuben,

Thanks for taking a look at this.

On Jan 21, 2014, at 4:07 AM, Reuben Thomas <address@hidden> wrote:
> I've run out of time for [[debugging the alien.default.memrchr crashes on 
> glib]] for now. However, I have an idea: how about adding asserts to your Lua 
> memrchr to check for out-of-bound accesses? I can't see anything wrong with 
> memrchr itself now, so I suspect bad arguments which merely result in nil 
> results in the Lua version.

I've noticed that about half the time, a random one out of the 100+ 
run-lisp-tests.lua checks (`make tests-check-local`) crashes zmacs using my Lua 
memrchr too.  Instrumenting shows that my memrchr returns the location of EOL 
prior to the one returned by find_substr().  Naïvely changing memrchr to start 
the search one byte higher in memory breaks everything though, so I need to 
spend some time understanding the details of find_substr, and either fix that 
and whatever changes ripple out from there, or make sure memrchr is interface 
compatible before swapping it out.  At least I have a way of pinning it down 
now... and then I can make the same changes in the alien.default.memrchr 
wrapper and hope that works too.

Gary V. Vaughan (gary AT gnu DOT org)

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