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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/46219] Generate indirect jump instruction on x86-64
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46219

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.10.28 22:58:27
          Component|rtl-optimization            |target
     Ever Confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-10-28 22:58:27 UTC ---
(define_insn "*sibcall_1_rex64"
  [(call (mem:QI (match_operand:DI 0 "sibcall_insn_operand" "s,U"))
         (match_operand 1 "" ""))]
  "TARGET_64BIT && SIBLING_CALL_P (insn)"
  "@
   jmp\t%P0
   jmp\t%A0"
  [(set_attr "type" "call")])

I think "m" needs to be added as a constraint in the above instruction.
Other than changing GCC, there is no way.