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Re: PR middle-end/8408


> > 	(validate_pattern): mark it as lvalue.
>
> Why is this part required?

Because otherwise the following warning triggers a bunch of time:

	/* Allowing non-lvalues in destinations -- particularly CONST_INT --
	   while not likely to occur at runtime, results in less efficient
	   code from insn-recog.c.  */
	if (set
	    && pred_name[0] != '\0'
	    && allows_non_lvalue)
	  {
	    message_with_line (pattern_lineno,
			"warning: destination operand %d allows non-lvalue",
			XINT (pattern, 0));
	  }

> The other part is definitely required.  It's simply amazing that
> we've not noticed it until now.

I couldn't believe it either :-)

-- 
Eric Botcazou


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