lra-constraints.c (process_address_1): Do not attempt to decompose addresses for…

lra-constraints.c (process_address_1): Do not attempt to decompose addresses for MEMs that satisfy fixed-form constraints.

	* lra-constraints.c (process_address_1): Do not attempt to decompose
	addresses for MEMs that satisfy fixed-form constraints.

From-SVN: r243632

gcc/ChangeLog

+2016-12-14  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* lra-constraints.c (process_address_1): Do not attempt to decompose
+	addresses for MEMs that satisfy fixed-form constraints.
+
 2016-12-14  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/78788

gcc/lra-constraints.c

@@ -3080,7 +3080,11 @@ process_address_1 (int nop, bool check_only_p,
 
   if (insn_extra_address_constraint (cn))
     decompose_lea_address (&ad, curr_id->operand_loc[nop]);
-  else if (MEM_P (op))
+  /* Do not attempt to decompose arbitrary addresses generated by combine
+     for asm operands with loose constraints, e.g 'X'.  */
+  else if (MEM_P (op)
+	   && !(get_constraint_type (cn) == CT_FIXED_FORM
+	        && constraint_satisfied_p (op, cn)))
     decompose_mem_address (&ad, op);
   else if (GET_CODE (op) == SUBREG
 	   && MEM_P (SUBREG_REG (op)))