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Re: [PATCH] PR 38201: -mfma/-mavx and -msse5/-msse4a don't work together


On Wed, Dec 10, 2008 at 1:53 AM, Richard Guenther
<richard.guenther@gmail.com> wrote:
> On Wed, Dec 10, 2008 at 3:39 AM, Ross Ridge <rridge@csclub.uwaterloo.ca> wrote:
>> H.J. Lu writes:
>>>Andrew recommended SSE5 FMA :-). The issue is the one you choose
>>>today may not be the one you want tomorrow in which case such a gcc
>>>is useless.
>>
>> I agree with H.J. Lu here, this isn't a choice that should be made
>> arbitrarily.  The choice should be made by the user.  The last thing
>> GCC needs is more undocumented behaviour that users unknowingly end up
>> depending on.
>
> But in this case the user chooses to let the compile choose.  HJs change results
> in less choice for the user.
>

The choice should be made based on actual chip, not arbitrarily today.


-- 
H.J.


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