[Bug target/68648] [4.9/5/6 Regression][ARM] ICE: fail to generate BIC(immediate) instruction

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68648

--- Comment #2 from ktkachov at gcc dot gnu.org ---
The problem is the post-reload andsi_iorsi3_notsi splitter that can generate a
(not (const_int 1)) rtx rather than doing constant folding