[wwwdocs] arm,aarc64: add initial gcc-11/changes.html entries

[wwwdocs] arm,aarc64: add initial gcc-11/changes.html entries

[Kyrylo Tkachov]

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Hi all,

This patch adds the arm and aarch64 sections changes.html for GCC 11.
There's more than that that went into the release, but this can serve as a starting point for filling the sections in.

Pushing to the repo.
Thanks,
Kyrill

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commit cf9d30057e18cc0d23f371f6682c19345b689d18
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date:   Mon Jan 25 09:35:35 2021 +0000

    arm,aarc64: add initial gcc-11/changes.html entries

diff --git a/htdocs/gcc-11/changes.html b/htdocs/gcc-11/changes.html
index 08a4c93a..f9701512 100644
--- a/htdocs/gcc-11/changes.html
+++ b/htdocs/gcc-11/changes.html
@@ -361,11 +361,60 @@ a work-in-progress.</p>
 <!-- .................................................................. -->
 <h2 id="targets">New Targets and Target Specific Improvements</h2>
 
-<!-- <h3 id="aarch64">AArch64</h3> -->
+<h3 id="arm-targets">AArch64 &amp; arm</h3>
+<ul>
+  <li>A number of new CPUs are supported through arguments to the
+  <code>-mcpu</code> and <code>-mtune</code> options in both
+  the arm and aarch64 backends (GCC identifiers in parentheses):
+    <ul>
+      <li>Arm Cortex-A78 (<code>cortex-a78</code>).</li>
+      <li>Arm Cortex-A78AE (<code>cortex-a78ae</code>).</li>
+      <li>Arm Cortex-A78C (<code>cortex-a78c</code>).</li>
+      <li>Arm Cortex-X1 (<code>cortex-x1</code>).</li>
+      <li>Arm Neoverse V1 (<code>neoverse-v1</code>).</li>
+      <li>Arm Neoverse N2 (<code>neoverse-n2</code>).</li>
+    </ul>
+  </li>
+  <li>GCC can now auto-vectorize operations performing
+  addition, subtraction, multiplication and the accumulate/subtract variants
+  on complex numbers, taking advantage of the Advanced SIMD instructions in
+  the Armv8.3-a (AArch64/AArch32), SVE (AArch64), SVE2 (AArch64) and MVE
+ (AArch32 M-profile) instruction sets.</li>
+</ul>
+
+
+<h3 id="aarch64">AArch64</h3>
+<ul>
+  <li> In addition to the above, the following AArch64-only
+  CPUs are now supported:
+    <ul>
+      <li>Fujitsu A64FX (<code>a64fx</code>).</li>
+      <li>Arm Cortex-R82 (<code>cortex-r82</code>).</li>
+    </ul>
+  </li>
+  <li>The AArch64 Armv8-R architecture is now supported through the
+  <code>-march=armv8-r</code> option.</li>
+  <li>Mitigation against the
+  <a href="https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/downloads/straight-line-speculation">Straight-line Speculation vulnerability</a>
+  is supported with the <code>-mharden-sls=</code> option.  Please refer to the
+  documentation for usage instructions.</li>
+  <li>The availability of Advanced SIMD intrinsics available through the
+  <code>arm_neon.h</code> header is improved and GCC 11.0 supports the full
+  set of intrinsics defined by ACLE Q3 2020.</li>
+</ul>
 
 <!-- <h3 id="arc">ARC</h3> -->
 
-<!-- <h3 id="arm">ARM</h3> -->
+<h3 id="arm">arm</h3>
+<ul>
+  <li>Initial auto-vectorization is now available when targeting the MVE
+  instruction set.</li>
+  <li>GCC can now make use of the Low Overhead Branch instruction in Armv8.1-M
+  to optimize loop counters and checks.</li>
+  <li>The <code>-mcpu=cortex-m55</code> option now supports the extensions
+  <code>+nomve</code> and <code>+nomve.fp</code> to control generation of
+  MVE and MVE floating-point instructions.</li>
+</ul>
 
 <!-- <h3 id="avr">AVR</h3> -->
 

Re: [wwwdocs] arm,aarc64: add initial gcc-11/changes.html entries

[Gerald Pfeifer]

Hi Kyrylo,

On Tue, 26 Jan 2021, Kyrylo Tkachov via Gcc-patches wrote:
> This patch adds the arm and aarch64 sections changes.html for GCC 11.

this is nice!

One question: why GCC 11.0 in the following? The first release is going 
to be GCC 11.1, and we general refer to major releases - could we say
"GCC 11" instead? Or do you want to use GCC 11.1?

+  <li>The availability of Advanced SIMD intrinsics available through the
+  <code>arm_neon.h</code> header is improved and GCC 11.0 supports the full
+  set of intrinsics defined by ACLE Q3 2020.</li>


> There's more than that that went into the release, but this can serve as 
> a starting point for filling the sections in.

Looking forward to more! :)

Gerald

RE: [wwwdocs] arm,aarc64: add initial gcc-11/changes.html entries

[Kyrylo Tkachov]

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Hi Gerald,

> -----Original Message-----
> From: Gerald Pfeifer <gerald@pfeifer.com>
> Sent: 20 March 2021 16:31
> To: Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>
> Cc: gcc-patches@gcc.gnu.org
> Subject: Re: [wwwdocs] arm,aarc64: add initial gcc-11/changes.html entries
> 
> Hi Kyrylo,
> 
> On Tue, 26 Jan 2021, Kyrylo Tkachov via Gcc-patches wrote:
> > This patch adds the arm and aarch64 sections changes.html for GCC 11.
> 
> this is nice!
> 
> One question: why GCC 11.0 in the following? The first release is going
> to be GCC 11.1, and we general refer to major releases - could we say
> "GCC 11" instead? Or do you want to use GCC 11.1?
> 

Indeed, I meant to use GCC 11.
Fixed with the attached (pushed) patch.
Thanks,
Kyrill

> +  <li>The availability of Advanced SIMD intrinsics available through the
> +  <code>arm_neon.h</code> header is improved and GCC 11.0 supports the
> full
> +  set of intrinsics defined by ACLE Q3 2020.</li>
> 
> 
> > There's more than that that went into the release, but this can serve as
> > a starting point for filling the sections in.
> 
> Looking forward to more! :)
> 
> Gerald

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commit c29a76bd12e67fe3bfae112cc1f7ed16b22b592a
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date:   Tue Mar 23 14:15:18 2021 +0000

    aarch64: Use GCC 11 rather than GCC 11.0

diff --git a/htdocs/gcc-11/changes.html b/htdocs/gcc-11/changes.html
index 69869309..667e0cb9 100644
--- a/htdocs/gcc-11/changes.html
+++ b/htdocs/gcc-11/changes.html
@@ -566,7 +566,7 @@ a work-in-progress.</p>
   is supported with the <code>-mharden-sls=</code> option.  Please refer to the
   documentation for usage instructions.</li>
   <li>The availability of Advanced SIMD intrinsics available through the
-  <code>arm_neon.h</code> header is improved and GCC 11.0 supports the full
+  <code>arm_neon.h</code> header is improved and GCC 11 supports the full
   set of intrinsics defined by ACLE Q3 2020.</li>
 </ul>