[PATCH: PR target/40697] Use shifts to extract most or least significant bits

[Steven Bosscher]

2009/7/14 Adam Nemet <anemet@caviumnetworks.com>:
> Why can't this be handled in the ARM "and" expander; also accept
> bitmasks in the const operand and emit the two shifts instead?
>
> This is at least how I am planning to handle emitting bit-extraction for
> AND in MIPS if the constant is too big but a bitmask.

An expander would also work, but IMHO this kind of optimization should
be in the middle end (i.e. shared code), and not in target code, if it
is helpful for multiple targets.

Ciao!
Steven