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Re: Fix Sparc shift optimization

On Mon, May 06, 2002 at 11:47:25AM -0700, David S. Miller wrote:
> Are you going to provide a facility so that we can deal with the fact
> that we've run out of constraint letters? :-)

Err, no.  He's saying

(define_split
  [(set (match_operand:SI 0 "register_operand" "")
	(ashift:SI (match_operand:SI 1 "register_operand" "")
		   (match_operand:SI 2 "const1_operand" "")))]
  ""
  [(set (match_dup 0) (plus:SI (match_dup 1) (match_dup 1)))]
  "")

Personally I don't think it makes any difference.

Incidentally, this test:

  if (GET_CODE (operands[2]) == CONST_INT
      && (unsigned HOST_WIDE_INT) INTVAL (operands[2]) > 31)
    operands[2] = GEN_INT (INTVAL (operands[2]) & 0x1f);

is redundant with both "I" and SHIFT_COUNT_TRUNCATED.


r~
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