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Date: Tue, 23 Apr 2002 16:05:00 -0000
To: Peter Barada <pbarada@mail.wm.sps.mot.com>
From: Alan Lehotsky <apl@alum.mit.edu>
Subject: Re: peephole2 question
Cc: gcc@gcc.gnu.org
Content-Type: text/plain; charset="us-ascii" ; format="flowed"
X-SW-Source: 2002-04/txt/msg01208.txt.bz2

You use a "match_dup" in the peephole result and an action statement that
does something like


(define_peephole2
   [(set (match_operand:DF 0 "m68k_freg_operand" "")
         (mem:DF (match_operand:SI 1 "m68k_areg_operand" "")))
    (set (match_operand:DF 2 "m68k_freg_operand" "")
         (match_operator:DF 3 "plus_or_mult_operator"
                  [(match_dup 2)
                  (match_dup 0)]))]
   "0 && TARGET_CFV4E
    && peep2_reg_dead_p (2, operands[0])
    && REGNO (operands[0]) != REGNO (operands[2])"
   [(set (match_dup 2)
         (match_dup 3)
     )]
   "
    operands[3] = gen_rtx (.....  operands[2], operands[1])
   ")

You might want to make your "plus_or_mult_operator()" function leave the
right code somewhere global so that you don't have to grovel thru the pattern
to find if it's PLUS or MULT....


At 6:10 PM -0400 4/23/02, Peter Barada wrote:
>I've got a peephole2 that uses match_operator to select both PLUS and
>MULT.  How to I specify in the new-insn-pattern the result of the
>match_operator?  In the following, what do I put in place of 'xxx'
>that means the operator that I think is in operands[3]:
>

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