md description for intruction that modifies multiple operands

[Eric Christopher]

> That didn't seem to work.  I also tried something like:
> 
> 	(define_insn "block4"
> 	  [(set (match_operand:SI 0 "register_operand" "+d")
> 	        (unspec:SI [(match_operand:SI 1 "register_operand" "+d")
> 	                    (match_operand:SI 2 "register_operand" "+d")
> 	                    (match_operand:SI 3 "register_operand" "+d")] 123))
> 	   (set (match_dup 1) (unspec:SI [(match_dup 0) (match_dup 2) (match_dup 3)] 124))
> 	   (set (match_dup 2) (unspec:SI [(match_dup 0) (match_dup 1) (match_dup 3)] 125))
> 	   (set (match_dup 3) (unspec:SI [(match_dup 0) (match_dup 1) (match_dup 2)] 126))]
> 	  "TARGET_FOO"
> 	  "block4\\t%0 # %0,%1,%2,%3")
> 
> which works a little better, but still seems to have some problems
> with the compiler recognizing that every operand is both an input and
> output.
> 
> Am I totally off track here?

I don't think so. Though it looks like you might want to define a single
unspec number for the pattern and maybe use a parallel? *guesses*

-eric

-- 
Eric Christopher <echristo@redhat.com>