Re: On -march=x86-64

[Allan Sandfeld Jensen]

On Donnerstag, 11. Juli 2019 20:58:04 CEST Allan Sandfeld Jensen wrote:
> Years ago I discovered Chrome was optimizing with  -march=x86-64, and
> knowing was an undocumented arch that would optimize for K8 I laughed at it
> and just removed that piece of idiocy from our fork of Chromium, so it
> would be faster than upstream. Recently though I noticed phoronix is also
> using now sometimes optimize with -march=x86-64 instead of using, well..
> nothing. as they should. And checking recent GCC documentation I noticed
> that in gcc 8 and gcc 9 documentation you are now documenting -march=x86-64
> and calling it a generic 64-bit processor. So now it is no longer a
> laughing matter that people mistake it for that.
> 
> I would suggest instead of fixing the documentation to say what
> -march=x86-64 actually does, that we should perhaps change it to do what
> people expect and make it an alias for generic?
> 
Nevermind, it was fixed back in 2007 when the generic architecture was 
introduced. The arch table is just misleading here.

Best regards
'Allan

gcc-10-20190714 is now available

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