[Bug target/119114] [14/15 regression] RISC-V: miscompile at -O3 since r14-4077-g86451305d8b

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119114

--- Comment #11 from Robin Dapp <rdapp at gcc dot gnu.org> ---
 /* In GIMPLE, getting rid of 2 conversions for one new results
    in smaller IL.  */
 (simplify
  (convert (bitop:cs@2 (nop_convert:s @0) @1))
  (if (GIMPLE
       && TREE_CODE (@1) != INTEGER_CST
       && tree_nop_conversion_p (type, TREE_TYPE (@2))
       && types_match (type, @0)
       && !POINTER_TYPE_P (TREE_TYPE (@0))
       && TREE_CODE (TREE_TYPE (@0)) != OFFSET_TYPE)
   (bitop @0 (convert @1)))))

This match pattern seems to eventually cause the -2.