Supporting 'MAC' instruction on gcc v4.1.1

[Rask Ingemann Lambertsen]

On Fri, May 11, 2007 at 05:56:16PM +0530, Rahul wrote:
> I have PLUS, MULT and following MAC pattern, in my target.md file.
> (define_insn ""
> 	[(set	(match_operand:SI 0 "data_reg" "=f")
> 		(plus:SI (mult:SI (match_operand:SI 1 "data_reg" "f")
> 			(match_operand:SI 2 "data_reg" "f"))
> 		(match_operand:SI 3 "data_reg" "0")))]
> 	""
> 	"mac\\t%1, %2, %3"
> 	[(set_attr "type" "arith")
> 	(set_attr "length" "2")]
> )
> 
> But for the following example
>  int a = 1;
>  int b = 2;
>  int c = 3;
>  c = c + a * b;
> the MAC pattern is not getting recognized, instead it is still using
> PLUS and MULT patterns.

   See what is in the progname.c.*.combine file produced by
-fdump-rtl-combine.

   Double check that your "data_reg" predicate is working.   

   You will make your life easier by giving the insn pattern a name. The RTL
dumps and in particular the -S -dp output will be easier to read.

-- 
Rask Ingemann Lambertsen