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Date: Fri, 27 Mar 2009 08:56:00 -0000
Message-ID: <8502af3c0903270156v63cc8edcw571e15442a8a23be@mail.gmail.com>
Subject: movsi on 16-bit machine: how to?
From: Florent DEFAY <spira.inhabitant@gmail.com>
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Hi,

I am implementing movsi on a 16-bit machine.
I did it this way:

;; ---- movsi

(define_insn "movsi"
  [(set (match_operand:SI 0 "nonimmediate_operand" "=3Dr,m,r,r")
        (match_operand:SI 1 "general_operand" "r,r,m,i"))]
  ""
  "#"
)

(define_split
  [(set (match_operand:SI 0 "nonimmediate_operand" "")
        (match_operand:SI 1 "general_operand" ""))]
  "reload_completed
  && !extra_constraint (operands[1], 'R')"
  [(set (match_dup 2)
        (match_dup 3))
   (set (match_dup 4)
        (match_dup 5))]
  {
    operands[2] =3D simplify_gen_subreg(HImode,operands[0],SImode,0);
    operands[4] =3D simplify_gen_subreg(HImode,operands[0],SImode,2);
    operands[3] =3D simplify_gen_subreg(HImode,operands[1],SImode,0);
    operands[5] =3D simplify_gen_subreg(HImode,operands[1],SImode,2);
  }
)


And I tried many other code. But each time I have some " insn does not
satisfy its constraints".

../../../gcc-4.3.3/libgcc/../gcc/libgcc2.c: In function =91__lshrsi3=92:
../../../gcc-4.3.3/libgcc/../gcc/libgcc2.c:435: error: insn does not
satisfy its constraints:
(insn 8 98 80 ../../../gcc-4.3.3/libgcc/../gcc/libgcc2.c:415 (set
(mem/c/i:SI (reg:HI 0 r0) [0 <result>+0 S4 A16])
        (reg:SI 1 r1)) 6 {movsi} (nil))


I am looking for a great and simple example of movsi for 16-bit
machine or movdi for 32-bit machine (because I think it is the same
mechanism);
or a basic method to do this.

I will be grateful for any advice.

Florent