[Bug target/114942] [14/15 Regression] ICE on valid code at -O1 with "-fno-tree-sra -fno-guess-branch-probability": in extract_constrain_insn, at recog.cc:2713

[ubizjak at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114942

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
This is the insn in question:

;; Alternative 1 is needed to work around LRA limitation, see PR82524.
 (define_insn_and_split "*<code>qi_ext<mode>_1_slp"
   [(set (strict_low_part (match_operand:QI 0 "register_operand" "+Q,&Q"))
         (any_logic:QI
           (subreg:QI
             (match_operator:SWI248 3 "extract_operator"
               [(match_operand 2 "int248_register_operand" "Q,Q")
                (const_int 8)
                (const_int 8)]) 0)
           (match_operand:QI 1 "nonimmediate_operand" "0,!qm")))
    (clobber (reg:CC FLAGS_REG))]

When targeting alternative 1, reload should use some other register for operand
2.