where is math function inlining decision done?

[IainS]

On 20 Jun 2008, at 13:03, FX wrote:

>> In the case of one processor __builtin_fmod is getting replaced by  
>> an inline
>> In the case of the other __builtin_fmod is generating a call to libm.
>>
>> Where does gcc decide how to replace __builtin_fmod  ?
>
> What are your compilation options? Do both processors use the same  
> fp unit (ie, i387 or sse)?

-O2 -gdwarf-2

They are different architectures, I expect the answer to be different.

I am interested to see what happens if I supply an inline asm fmod -  
but I don't know how/where gcc picks this up from.

Iain