[Bug middle-end/50481] builtin to reverse the bit order

[disservin.social at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50481

Disservin <disservin.social at gmail dot com> changed:

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--- Comment #18 from Disservin <disservin.social at gmail dot com> ---
> I have a patch to add __builtin_bitreverse128 support and hook some 
> bitreverse match.pd optimizations.

Thanks. I'll try to prepare a patch for aarch64 soon, which lowers this to rbit
when possible, this shouldn't need much since the insn already exist iirc