[PATCH] D14234: [ARM] Recognize bit-reversal idioms

[Matt Arsenault via llvm-commits]

On 11/02/2015 12:35 PM, James Molloy wrote:
> OK, then I have a better idea: let's do it in instcombine.
>
> Instcombine already does stuff like this for byteswaps -  it should be 
> possible to make it cover this case too. Instcombine is also a better 
> place to cover the bittwiddling hacks Joerg mentioned. I only 
> discounted it originally because I felt this was too ARM specific to 
> plumb right the way through the midend.
>
> Does this sound alright?
Yes, this sounds better