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In-Reply-To: <002601c83c7c$b3763960$33160e98@ece.ncsu.edu>
Subject: RE: Help with another constraint
To: "Balaji V. Iyer" <bviyer@ncsu.edu>
Cc: gcc@gcc.gnu.org, openrisc@opencores.org,         "'Rask Ingemann Lambertsen'" <rask@sygehus.dk>
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From: Revital1 Eres <ERES@il.ibm.com>
Date: Wed, 12 Dec 2007 12:53:00 -0000
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Hello,

I think you should add the pair of constraints m and I respectively to
the description of the instruction in your md file (and a relevant
case 8 to handle such instruction), i.e.:

 (define_insn "movqi"
-  [(set (match_operand:QI 0 "nonimmediate_operand" "=p,q,m,m,p,q,p,q")
-        (match_operand:QI 1 "general_operand"       "m,m,p,q,p,q,I,I"))]
+  [(set (match_operand:QI 0 "nonimmediate_operand" "=p,q,m,m,p,q,p,q,m")
+        (match_operand:QI 1 "general_operand"       "m,m,p,q,p,q,I,I,I"))]
   ""
   "*
   switch(which_alternative)
@@ -17,6 +17,8 @@
      case 6:
      case 7:
        return \"l.addi  \\t%0,r0,%1\\t # move immediate\";,
+     case 8:
+       return ...;
      default:
        return \"invalid alternative\";
    }

It seems that the pair m and I is missing (which indicate the memory =
constant instruction).  You could look for which_alternative variable
in GCC internals for more details on this.

Revital