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[1/14,x86_64] Vector math functions (vector cos)

Message ID CAMXFM3v5rwYFhU9rGhv5ypnM+jw4egJJLjbVbh6Tkwz46khppg@mail.gmail.com
State New
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Commit Message

Andrew Senkevich June 8, 2015, 4:07 p.m. UTC 
2015-06-08 16:06 GMT+03:00 Joseph Myers <joseph@codesourcery.com>:
> On Mon, 8 Jun 2015, Andrew Senkevich wrote:
>
>> +* Added vector math library named libmvec with the following vectorized x86_64
>> +  implementations: cos.
>> +  Naming of x86_64 implementations is in accordance with
>> +  Vector ABI <https://groups.google.com/forum/#!topic/x86-64-abi/LmppCfN1rZ4>.
>> +  Vector math library build and ABI testing enabled by default for x86_64.
>
> I don't think the NEWS file should point to a site requiring non-free
> JavaScript; host a copy of the ABI somewhere else (maybe on the glibc
> wiki).
>
> I think the NEWS file needs to give information from the perspective of
> people building and using glibc.  That includes: the library can be
> disabled with --disable-mathvec (the configure option also needs
> documenting in manual/install.texi, with INSTALL being regenerated); use
> of the functions is enabled with -fopenmp -ffast-math -O3 (or whatever)
> and the library is linked in as needed when using -lm rather than needing
> to specify -lmvec explicitly.

I have prepared wiki page and put link to it.


--
WBR,
Andrew

Comments

Joseph Myers June 8, 2015, 5:08 p.m. UTC | #1 
On Mon, 8 Jun 2015, Andrew Senkevich wrote:

> diff --git a/NEWS b/NEWS
> index 881e61c..5e223a1 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -50,6 +50,14 @@ Version 2.22
>  * CVE-2014-8121 The NSS backends shared internal state between the getXXent
>    and getXXbyYY NSS calls for the same database, causing a denial-of-service
>    condition in some applications.
> +
> +* Added vector math library named libmvec with the following vectorized x86_64
> +  implementations: cos.
> +  The library can be disabled with --disable-mathvec. Use of the functions is
> +  enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
> +  The library is linked in as needed when using -lm (no need to specify -lmvec
> +  explicitly).
> +  Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.

This seems reasonable as a starting point (given install.texi updated as 
well).  The release manager may wish to edit the NEWS entries, of course.
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Patch

diff --git a/NEWS b/NEWS
index 881e61c..5e223a1 100644
--- a/NEWS
+++ b/NEWS
@@ -50,6 +50,14 @@  Version 2.22
 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
   and getXXbyYY NSS calls for the same database, causing a denial-of-service
   condition in some applications.
+
+* Added vector math library named libmvec with the following vectorized x86_64
+  implementations: cos.
+  The library can be disabled with --disable-mathvec. Use of the functions is
+  enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
+  The library is linked in as needed when using -lm (no need to specify -lmvec
+  explicitly).
+  Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
 ^L
 Version 2.21