[Bug target/94789] Failure to take advantage of shift operand semantics to turn subtraction into negate

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94789

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Maybe (-b)&31 instead? And then the &31 could optimized out later on?