re PR rtl-optimization/22509 (elemental.f90 testsuite failure (-fweb))

	PR rtl-optimization/22509
	* local-alloc.c (memref_used_between_p): Check whether a function call
	could not reference the memref.

From-SVN: r106783

gcc/ChangeLog

+2005-11-11  Zdenek Dvorak  <dvorakz@suse.cz>
+
+	PR rtl-optimization/22509
+	* local-alloc.c (memref_used_between_p): Check whether a function call
+	could not reference the memref.
+
 2005-11-11  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* postreload.c (reload_cse_simplify_operands): Fix bug in sorting

gcc/local-alloc.c

@@ -762,8 +762,19 @@ memref_used_between_p (rtx memref, rtx start, rtx end)
 
   for (insn = NEXT_INSN (start); insn != NEXT_INSN (end);
        insn = NEXT_INSN (insn))
-    if (INSN_P (insn) && memref_referenced_p (memref, PATTERN (insn)))
-      return 1;
+    {
+      if (!INSN_P (insn))
+	continue;
+      
+      if (memref_referenced_p (memref, PATTERN (insn)))
+	return 1;
+
+      /* Nonconst functions may access memory.  */
+      if (CALL_P (insn)
+	  && (! CONST_OR_PURE_CALL_P (insn)
+	      || pure_call_p (insn)))
+	return 1;
+    }
 
   return 0;
 }