extend.texi (Extended Asm): The '+' constraint does not require a register.

	* doc/extend.texi (Extended Asm): The '+' constraint does not
	require a register.

From-SVN: r192756

gcc/ChangeLog

+2012-10-23  Ian Lance Taylor  <iant@google.com>
+
+	* doc/extend.texi (Extended Asm): The '+' constraint does not
+	require a register.
+
 2012-10-23  Jeff Law  <law@redhat.com>
 
 	* tree-ssa-threadedge.c (thread_across_edge): Remove unused

gcc/doc/extend.texi

@@ -5864,10 +5864,7 @@ The ordinary output operands must be write-only; GCC will assume that
 the values in these operands before the instruction are dead and need
 not be generated.  Extended asm supports input-output or read-write
 operands.  Use the constraint character @samp{+} to indicate such an
-operand and list it with the output operands.  You should only use
-read-write operands when the constraints for the operand (or the
-operand in which only some of the bits are to be changed) allow a
-register.
+operand and list it with the output operands.
 
 You may, as an alternative, logically split its function into two
 separate operands, one input operand and one write-only output