Is "-march=atom" deprecated?

[Mason]

On 30/09/2016 05:04, waltdnes@waltdnes.org wrote:

> On Thu, Sep 29, 2016 at 10:21:46AM +0100, Andrew Haley wrote
> 
>> That sounds fine.  Intel have used the "Atom" trademark to refer to
>> Bonnell, Silvermont, and Goldmont processors.  We like to be more
>> specific.
> 
> Thanks.  For future reference, what does "-march=atom" do?  Do I get
> a "bonnell" build, or generic, or something else?

As far as I can tell, the -march=atom option was documented until gcc 4.8

https://gcc.gnu.org/onlinedocs/gcc-4.8.4/gcc/i386-and-x86-64-Options.html

'atom'
    Intel Atom CPU with 64-bit extensions, MOVBE, MMX, SSE, SSE2, SSE3 and SSSE3 instruction set support.

Then they changed the doc for gcc 4.9

'bonnell'
    Intel Bonnell CPU with 64-bit extensions, MOVBE, MMX, SSE, SSE2, SSE3 and SSSE3 instruction set support.
'silvermont'
    Intel Silvermont CPU with 64-bit extensions, MOVBE, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, POPCNT, AES, PCLMUL and RDRND instruction set support.

It does look like 'atom' and 'bonnell' are similar.

I don't have 4.9 handy, try this:

echo | gcc -xc -S -fverbose-asm -march=atom -o v1.s -
echo | gcc -xc -S -fverbose-asm -march=bonnell -o v2.s -
diff -u v1.s v2.s

Maybe they are identical?

Regards.