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Re: [PATCH] x86emul/test: drop Xeon Phi S/G prefetch special case
- To: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 16 Oct 2024 12:54:48 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 16 Oct 2024 10:54:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.10.2024 12:34, Alejandro Vallejo wrote:
> On Wed Oct 16, 2024 at 8:46 AM BST, Jan Beulich wrote:
>> --- a/tools/tests/x86_emulator/evex-disp8.c
>> +++ b/tools/tests/x86_emulator/evex-disp8.c
>> @@ -911,10 +911,8 @@ static void test_one(const struct test *
>> n = test->scale == SC_vl ? vsz : esz;
>> if ( !sg )
>> n += vsz;
>> - else if ( !strstr(test->mnemonic, "pf") )
>> - n += esz;
>> else
>> - ++n;
>> + n += esz;
>
> Just making sure. This is leftover from 85191cf32180("x86: drop Xeon Phi
> support"), right? Dead code after the removal of the avx512pf group.
Yes.
> If so, that sounds good. But (not having looking at the general logic), how
> come we go from ++n to "n += esz". It's all quite cryptic.
It's the (prior) if() portion we're keeping, and the "else" we're dropping.
The if() checks for _no_ "pf" in the mnemonic. "Going from ++n to n+= esz"
is merely an effect of how the change is being expressed as diff.
Jan
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