2009/11/6 Richard Henderson <r...@redhat.com>:
> On 11/06/2009 05:29 AM, Mohamed Shafi wrote:
>>
>> The target that i am working on has 1& 2 bit shift-add patterns.
>> GCC is not generating shift-add patterns when the shift count is 1. It
>> is currently generating add operations. What should be done to
>> generate shift-add pattern instead of add-add pattern?
>
> I'm not sure. You may have to resort to matching
>
> (set (match_operand 0 "register_operand" "")
> (plus (plus (match_operand 1 "register_operand" "")
> (match_dup 1))
> (match_operand 2 "register_operand" ""))))
>
> But you should debug make_compound_operation first to
> figure out what's going on for your port, because it's
> working for x86_64:
>
> long foo(long a, long b) { return a*2 + b; }
>
> leaq (%rsi,%rdi,2), %rax # 8 *lea_2_rex64
> ret # 26 return_internal
>
>
> r~
>
I have fixed this. The culprit was the cost factor. I added the
case in targetm.rtx_costs and now it works properly. But i am having
issues with the reload.
Regards,
Shafi
