[PATCH] D47059: [InstCombine] Calloc-ed strings optimizations

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

A nice improvement would be to also support a case like
memset(s, 0, x); // x > 0
strlen(s); // simplify to zero

The problem I don't know yet how to solve: how to find out that there was memset before strlen called with the same string. Suggestions welcome.

And we would have to check for "s" if is captured between memset and strlen... <---- probably not hard to do

But anyway, this patch should focus on calloc-ed strings only.


Repository:
  rL LLVM

https://reviews.llvm.org/D47059