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Re: target specific builtin expansion (middle end and back end definition inconsistence problem?).

Hi Ian,

2012/4/23 Ian Lance Taylor <>:
> Feng LI <> writes:
>> Hi Ian,
>> 2012/4/22 Ian Lance Taylor <>:
>>> Feng LI <> writes:
>>>> Yes, you are right. But how could I reference to a backend defined builtin
>>>> function in the middle end (I need to generate the builtin function in the
>>>> middle end and expand it in x86 backend)?
>>> If the function doesn't have a machine-independent definition, then use
>>> a target hook.
>> Then I remove the duplicate builtin definition in x86 backend.
>> I define the builtin function with built_in_class as BUILT_IN_MD in
>> builtins.def.
> Sorry, I meant use a target hook to actually generate the call
> expression. ?The target hook can refer to the target-specific builtin
> function.
Just for confirmation, do you mean by calling this hook:
targetm.builtin_decl (unsigned code, bool initialized_p)
in the middle end for getting the builtin definition in the backend?

Probably I'm asking a silly question, when is the time of the initialization
of the backend builtin functions. I'm refering it in gcc middle end, near
OPENMP expansion (omp-low.c) pass.

> Ian

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