[multiple changes]

2004-11-18  Andrew Pinski  <pinskia@physics.uc.edu>

        PR middle-end/18164
        * gimplify.c (gimplify_asm_expr): If the length of an output operand
        is zero, do not process it, just let it go through.

2004-11-28  Andrew Pinski  <pinskia@physics.uc.edu>

        * gcc.dg/pr18164.c: New test.

From-SVN: r91459

gcc/ChangeLog

+2004-11-18  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	PR middle-end/18164
+	* gimplify.c (gimplify_asm_expr): If the length of an output operand
+	is zero, do not process it, just let it go through.
+
 2004-11-28  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 	    Diego Novillo  <dnovillo@redhat.com>	    
 

gcc/gimplify.c

@@ -3120,8 +3120,12 @@ gimplify_asm_expr (tree *expr_p, tree *pre_p, tree *post_p)
   ret = GS_ALL_DONE;
   for (i = 0, link = ASM_OUTPUTS (expr); link; ++i, link = TREE_CHAIN (link))
     {
+      size_t constraint_len;
       oconstraints[i] = constraint
 	= TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+      constraint_len = strlen (constraint);
+      if (constraint_len == 0)
+        continue;
 
       parse_output_constraint (&constraint, i, 0, 0,
 			       &allows_mem, &allows_reg, &is_inout);
@@ -3145,7 +3149,6 @@ gimplify_asm_expr (tree *expr_p, tree *pre_p, tree *post_p)
  	     operands.  */
 	  tree input;
 	  char buf[10];
-	  size_t constraint_len = strlen (constraint);
 
 	  /* Turn the in/out constraint into an output constraint.  */
 	  char *p = xstrdup (constraint);

gcc/testsuite/ChangeLog

+2004-11-28  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	* gcc.dg/pr18164.c: New test.
+
 2004-11-28  Matt Kraai  <kraai@alumni.cmu.edu>
 
 	* gcc.dg/funroll-loops-all.c: New.

gcc/testsuite/gcc.dg/pr18164.c

+/* { dg-do compile } */
+void
+f (void)
+{
+  int x;
+  asm ("" :  "" (x)); /* {dg-error "output operand constraint lacks" } */
+}