[Bug target/67573] [SH] wrong code generated for libstdc++-v3/src/c++11/cxx11-shim_facets.cc at -mlra

["kkojima at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67573

--- Comment #2 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
It seems that LRA allocates r7 for the scratch reg at

(define_insn_and_split "call_value_pcrel"
  [(set (match_operand 0 "" "=rf")
        (call (mem:SI (match_operand:SI 1 "symbol_ref_operand" ""))
              (match_operand 2 "" "")))
   (use (reg:SI FPSCR_MODES_REG))
   (use (reg:SI PIC_REG))
   (clobber (reg:SI PR_REG))
   (use (match_scratch:SI 3 "=r"))]

in the problematic case and the insn

(call_insn 208 207 209 22 (parallel [
            (set (reg:SI 0 r0)
                (call (mem:SI (symbol_ref:SI
("_ZNKSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE4copyEPwjj") [flags
0x41]  <function_decl 0xb72c0280 copy>) [0 copy S4 A32])
                    (const_int 0 [0])))
            (use (reg:SI 154 fpscr0))
            (use (reg:SI 12 r12))
            (clobber (reg:SI 146 pr))
            (clobber (reg:SI 7 r7 [357]))
        ]) fa.cc:484 322 {call_value_pcrel}
     (expr_list:REG_EH_REGION (const_int 4 [0x4])
        (expr_list:REG_CALL_DECL (symbol_ref:SI
("_ZNKSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE4copyEPwjj") [flags
0x41]  <function_decl 0xb72c0280 copy>)
            (nil)))
    (expr_list:SI (use (reg:SI 4 r4))
        (expr_list:SI (use (reg:SI 5 r5))
            (expr_list:SI (use (reg:SI 6 r6))
                (expr_list:SI (use (reg:SI 7 r7))
                    (nil))))))

made the following passes confused.