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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/64450] Optimize   0>=p-q   to   q>=p   for
 char*p,*q;
Date: Sun, 14 May 2023 23:20:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D64450

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(for cmp (tcc_comparison)
 (simplify
  (cmp (pointer_diff @0 @1) integer_zero_p)
  (cmp @0 @1)))

Maybe ....

But we might also need handle the match patterns for too:
A CMP B ? A - B : -(A - B)
A CMP B ? A - B : B - A

(which is also on my todo list anyways).=