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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/57742] memset(malloc(n),0,n) -> calloc(n,1)
Date: Sat, 22 Feb 2014 15:44:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57742

--- Comment #13 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #12)
> Yes, the fact that the return value p cannot be equal to q inside the
> function is not exposable.

Richard fixed this in PR 50262, yay!
So this PR is worth working on again.