[PATCH] [asan] Speed up interesting alloca checks

[Chandler Carruth]

On Thu, Mar 26, 2015 at 3:34 PM, Kostya Serebryany <kcc at google.com> wrote:

> > > Each walk of the use list of the alloca is relatively expensive -- it
> is a linked list and cache hostile.
>
> >
>
>
> But won't we need it anyway regardless of caching-cs-precomputing?


Yes, what I'm saying is that reducing the number of times you walk the use
list is relevant. It's a locality optimization. Where possible, it is good
to try to do as much work as possible during a single use-list traversal
rather than to traverse every alloca instructions' use list multiple times
for the multiple things you might need to do.
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