2010/12/10 WANG.Jiong <wong.kwongy...@gmail.com>:
> On 12/10/2010 02:17 PM, Liu wrote:
>
> Hi all,
> I'm porting gcc to a MIPS-based DSP, I need write some builtin
> func for some insns, but I can't find a doc., any one should help me?
> Show me a example please? Thanks very much.
>
> Liu.
>
>
> Maybe you should at least implement the following two hooks:
>
> TARGET_INIT_BUILTINS
> ---> to do some initialization
>
> TARGET_EXPAND_BUILTIN
> ---> to expand builtin related tree to rtl
> I suggest you define some UNSPEC rtl, like:
> (define_insn "xxx"
> [set (match_operand: .....)
> (unspec:.... [...] UNSPEC_XXX)]
> ......
> )
>
> and then expand builtin tree to these rtl by calling the
> related gen_xxx
>
> Suggest you to see s390's related hook implementation.
>
> --
> Best,
> Wong.KwongYuan
Dear Wong.KwongYuan,
Thank you very much! Your answer is very clear!
I'll look into it, maybe you will help me more when I get more problems.
Thanks again!
Liu.
