[Patch, i386] PR 59422 - Support more targets for function multi versioning

[Gopalasubramanian, Ganesh]

> Btw, I couldn't find anything that corresponds to gcc's btver2 arch. Is that an old term for what has become the Jaguar architecture?

Yes, "btver2" = "jaguar". We have the name as per its family name (i.e, bobcat family) in GCC. 
Similarly we have the names "bdver2" = "piledriver", "bdver3" = "steamroller" as per their family (bulldozer) name.

Regards
Ganesh

-----Original Message-----
From: Allan Sandfeld Jensen [mailto:carewolf@gmail.com] 
Sent: Monday, December 16, 2013 12:25 AM
To: Uros Bizjak
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [Patch, i386] PR 59422 - Support more targets for function multi versioning

Hi again
On Wednesday 11 December 2013, Uros Bizjak wrote:
> Hello!
> 
> > PR gcc/59422
> > 
> > This patch extends the supported targets for function multi versiong 
> > to also include Haswell, Silvermont, and the most recent AMD models. 
> > It also prioritizes AVX2 versions over AMD specific pre-AVX2 versions.
> 
> Please add a ChangeLog entry and attach the complete patch. Please 
> also state how you tested the patch, as outlined in the instructions 
> [1].
> 
> [1] http://gcc.gnu.org/contribute.html
> 
Updated patch for better CPU model detection and added ChangeLog.

The patch has been tested with the attached test.cpp. Verified that it doesn't build before the patch, and that it builds after, and verified it selects correct versions at runtime based on either CPU model or supported ISA (tested on 3 machines: SandyBridge, IvyBridge and Phenom II).

Btw, I couldn't find anything that corresponds to gcc's btver2 arch. Is that an old term for what has become the Jaguar architecture?

`Allan