[Bug middle-end/98865] Missed transform of (a >> 63) * b

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98865

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Target|                            |x86_64-*-*

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Happens in Botan AES-128/XTS (seen in PR98856).  Probably sth for RTL expansion
or even match.pd and not target specific.  Quite faster for > word_mode
arithmetic (only the upper part needs shifting and can be shared for the
bitwise and) - but that's then really for RTL expansion.