[GCC 4.8 wwwdocs] PATCH: Mention several user-visible changes for x86

Igor Zamyatin izamyatin@gmail.com
Mon Feb 18 06:28:00 GMT 2013


Gerald,

Thanks a lot for your remarks!

Below is updated patch which will be checked in.


Thanks,
Igor

On Mon, Feb 18, 2013 at 3:07 AM, Gerald Pfeifer <gerald@pfeifer.com> wrote:
> On Fri, 15 Feb 2013, Igor Zamyatin wrote:
>> Is it ok for wwwdocs?
>
> Index: htdocs/gcc-4.8/changes.html
> ===================================================================
> +     <li>Support for the new Intel processor codename Broadwell with RDSEED,
> +     ADCX, ADOX, PREFETCHW is available through <code>-madx</code>,
> +     <code>-mprfchw</code>, <code>-mrdseed</code>.
>
> Can you make this <code>RDSEED</code>, <code>... and so forth?
> (This is a bit borderline, in that one could also see this as
> more general references, but usually we mark those up.)
>
> And "...through the ... command-line options."?
>
> +     <li> Support for Intel RTM and HLE intrinsics, built-in
>
> "the ... intrinsics" (and same below for "instruction sets")
>
> +     <li> x86 backend was improved to allow option
> <code>-fscedule-insns</code> to work reliably.
>
> "The x86 backend has been improved..."
>
> +     This option can be used to schedule instructions better and can
> lead to improved performace in certain cases.
>
> This line is quite long, can you break lines around 76 columns?
>
> And, let's be a bit more brave and omit either "can" or "in certain
> cases".  Otherwise this may sounds too unlikely. :-)
>
> The patch is fine with changes along the lines described above.
>
> Thanks,
> Gerald

Index: htdocs/gcc-4.8/changes.html
  ===================================================================
  RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.8/changes.html,v
  retrieving revision 1.95
  diff -c -r1.95 changes.html
  *** htdocs/gcc-4.8/changes.html 11 Feb 2013 15:12:58 -0000      1.95
  --- htdocs/gcc-4.8/changes.html 12 Feb 2013 15:10:41 -0000
  ***************
  *** 460,465 ****
  --- 460,471 ----
        wrong results.  You must build all
        modules with <code>-mpreferred-stack-boundary=3</code>, including any
        libraries.  This includes the system libraries and startup modules.</li>
  +     <li>Support for the new Intel processor codename Broadwell with
  +     <code>RDSEED</code>, <code>ADCX</code>, <code>ADOX</code>,
  +     <code>PREFETCHW</code> is available through <code>-madx</code>,
  +     <code>-mprfchw</code>, <code>-mrdseed</code> command-line options.
  +     </li>
  +     <li> Support for the Intel RTM and HLE intrinsics, built-in
  functions and code generation is available via <code>-mrtm</code> and
  <code>-mhle</code>.
  +     </li>
  +     <li> Support for the Intel FXSR, XSAVE and XSAVEOPT instruction
 sets. Intrinsics and built-in functions are available
  +     via <code>-mfxsr</code>, <code>-mxsave</code> and
 <code>-mxsaveopt</code> respectively.
  +     </li>
        <li> New built-in functions to detect run-time CPU type and ISA:
        <ul>
          <li>A built-in function <code>__builtin_cpu_is</code> has
been added to
  ***************
  *** 524,529 ****
  --- 530,538 ----
        <a href="http://gcc.gnu.org/wiki/FunctionMultiVersioning">wiki</a>
  for more
        information.
        </li>
  +     <li> The x86 backend has been improved to allow option
 <code>-fscedule-insns</code> to work reliably.
  +     This option can be used to schedule instructions better and leads to
  +     improved performace in certain cases.
  +     </li>
        <li> Windows MinGW-w64 targets (<code>*-w64-mingw*</code>)
  require at least r5437 from the Mingw-w64 trunk. </li>
      </ul>



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