[committed][wwwdocs] gcc-12/changes.html: Document RISC-V changes

[committed][wwwdocs] gcc-12/changes.html: Document RISC-V changes

[Kito Cheng]

---
 htdocs/gcc-12/changes.html | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
index 78b7b05f..e9f132c0 100644
--- a/htdocs/gcc-12/changes.html
+++ b/htdocs/gcc-12/changes.html
@@ -736,7 +736,18 @@ function Multiply (S1, S2 : Sign) return Sign is
 </ul>
 <!-- <h3 id="s390">S/390, System z, IBM z Systems</h3> -->
 
-<!-- <h3 id="riscv">RISC-V</h3> -->
+<h3 id="riscv">RISC-V</h3>
+<ul>
+    <li>Default ISA spec version was bump to 20191213, more detail see this <a
+    href"https://groups.google.com/a/groups.riscv.org/g/sw-dev/c/aE1ZeHHCYf4">
+    announcement</a></li>
+    <li>New ISA extension support for zba, zbb, zbc, zbs was added.</li>
+    <li>New ISA extension support for vector and scalar crypto was added, only
+	support architecture testing marco and <code>-march=</code> parsing.</li>
+    <li>The option <code>-mtune=thead-c906</code> is added to tune for T-HEAD
+	c906 cores.</li>
+  </li>
+</ul>
 
 <!-- <h3 id="rx">RX</h3> -->
 
-- 
2.17.1

Re: [committed][wwwdocs] gcc-12/changes.html: Document RISC-V changes

[Gerald Pfeifer]

On Thu, 28 Apr 2022, Kito Cheng wrote:
> ---
>  htdocs/gcc-12/changes.html | 13 ++++++++++++-
:
> +    <li>New ISA extension support for vector and scalar crypto was added, only
> +	support architecture testing marco and <code>-march=</code> parsing.</li>

I realized I'm not sure I understand what the second part ("only 
support...") means.

That for the time being (back then) only the macros and -march parsing 
were supported?

Gerald

Re: [committed][wwwdocs] gcc-12/changes.html: Document RISC-V changes

[Palmer Dabbelt]

On Fri, 17 May 2024 14:30:49 PDT (-0700), gerald@pfeifer.com wrote:
> On Thu, 28 Apr 2022, Kito Cheng wrote:
>> ---
>>  htdocs/gcc-12/changes.html | 13 ++++++++++++-
> :
>> +    <li>New ISA extension support for vector and scalar crypto was added, only
>> +	support architecture testing marco and <code>-march=</code> parsing.</li>
>
> I realized I'm not sure I understand what the second part ("only
> support...") means.
>
> That for the time being (back then) only the macros and -march parsing
> were supported?

Ya, I guess it's kind of an odd phrasing.  Maybe it should be something 
like

    <li>The vector and scalar crypto extensions are now accepted in ISA 
    strings via the <code>-march</code> argument.  Note that enabling these 
    extensions will only set the coorespending feature test macros and 
    enable assembler support, they don't yet generate binaries with the 
    instructions added in these extensions.</li>

> Gerald

Re: [committed][wwwdocs] gcc-12/changes.html: Document RISC-V changes

[Gerald Pfeifer]

On Fri, 17 May 2024, Palmer Dabbelt wrote:
> Ya, I guess it's kind of an odd phrasing.  Maybe it should be something like

Yes, this would have helped me understand. Thank you.

>    <li>The vector and scalar crypto extensions are now accepted in ISA strings
>    via the <code>-march</code> argument.  Note that enabling these extensions
>    will only set the coorespending feature test macros and enable assembler
                       ^^^^^^^^^^^^^
>    support, they don't yet generate binaries with the instructions added in
>    these extensions.</li>

Are you going to push this change (with the typo marked above fixed and
maybe "added by these extensions" instead of "...in...")?

Gerald