------- Comment #19 from rakdver at atrey dot karlin dot mff dot cuni dot cz 2007-03-07 22:17 ------- Subject: Re: overflow warnings should not be enabled with -Wall
> IIRC there are some cases that are only caught in the 2nd vrp run. It is still > a possibility if this bug cannot be fixed otherwise. > > However, I don't see the issue with this testcase. > > a) its not a flex array well, it may be a flex array -- it is at the end of the structure. > b) the unrolled loop produces out of bounds accesses > c) hence, the unrolled version cannot ever be used no, this cannot be derived. > d) it shouldn't be produced in the first place. Well, yes, this is true. It is quite unlikely that a programmer would use length of 5 for a tail array, hence we should take this as a hint and avoid prefetching the array. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31058
