https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63620

--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
Please note that:

(define_insn "*pushtf"
  [(set (match_operand:TF 0 "push_operand" "=<,<")
    (match_operand:TF 1 "general_no_elim_operand" "x,*roF"))]
  "TARGET_64BIT || TARGET_SSE"
{
  /* This insn should be already split before reg-stack.  */
  gcc_unreachable ();
}
  [(set_attr "isa" "*,x64")
   (set_attr "type" "multi")
   (set_attr "unit" "sse,*")
   (set_attr "mode" "TF,DI")])

in effect looks like:

(define_insn "*pushtf"
  [(set (match_operand:TF 0 "push_operand" "=<")
    (match_operand:TF 1 "general_no_elim_operand" "x"))]

on 32bit x86, due to "isa" attribute.

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