[Bug target/100216] arm: UB in arm_canonicalize_comparison (shift exponent 127 is too large for 64-bit type)

[rearnsha at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100216

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-04-23
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Confirmed by visual inspection.  Clearly this code was written at a time when
the largest integral mode on Arm was DImode.  It won't work for wider modes and
it won't do anything for non-integral modes.

Needs an overhaul.