[Bug target/109414] RISC-V: unnecessary sext.w in rv64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109414

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Actually this more related to WORD_REGISTER_OPERATIONS .

(insn 7 4 8 2 (set (reg:SI 77)
        (plus:SI (subreg/s/u:SI (reg/v:DI 74 [ x ]) 0)
            (const_int 1 [0x1]))) "/app/example.cpp":3:12 -1
     (nil))

GCC then thinks that is an add on all 64bit which is not true ...