record_reg_classes): When an alternative requires a match...

record_reg_classes): When an alternative requires a match, but we do
it with a copy into a register, that alternative wins.

From-SVN: r3862

gcc/regclass.c

@@ -957,18 +957,12 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn)
 		  if (rtx_equal_p (ops[j], op))
 		    ;
 
-		  /* If we can't put the other operand into a register, this
-		     alternative can't be used.  */
-
-		  else if (classes[j] == NO_REGS)
-		    alt_fail = 1;
+		  /* If we can put the other operand into a register, add to
+		     the cost of this alternative the cost to copy this
+		     operand to the register used for the other operand.  */
 
-		  /* Otherwise, add to the cost of this alternative the cost
-		     to copy this operand to the register used for the other
-		     operand.  */
-
-		  else
-		    alt_cost += copy_cost (op, mode, classes[j], 1);
+		  if (classes[j] != NO_REGS)
+		    alt_cost += copy_cost (op, mode, classes[j], 1), win = 1;
 		}
 	      else if (GET_CODE (ops[j]) != REG
 		       || REGNO (ops[j]) < FIRST_PSEUDO_REGISTER)