[PATCH] D27781: [X86] Fold (setcc (cmp (atomic_load_add x, -C) C), COND) to (setcc (LADD x, -C), COND) (PR31367)

[Reid Kleckner via Phabricator via llvm-commits]

rnk accepted this revision.
rnk added a comment.
This revision is now accepted and ready to land.

We stared at this for a while and convinced ourselves that it is correct. (cmp X C) should produce the same flags as (sub X C), and (atomic_load_add X -C) should produce the flags of (sub X C).


https://reviews.llvm.org/D27781