Alexander Monakov <amonakov@ispras.ru> wrote:

> On Wed, 4 Aug 2021, Stefan Kanthak wrote:
>> The change just follows by removing 6 LOC/instructions.-)
> 
> Have you considered collecting the three bits in one go via a multiplication?

No. My mind is not that twisted;-)

> You can first isolate the necessary bits with 'and $0x4300, %eax', then do
> 'imul $0x910000, %eax, %eax' to put the required bits in EAX[31:29] in the
> right order, then shift right by 29. Three instructions, 14 bytes.

Thanks, VERY NICE! How did you come up to it?

Revised patch with shorter bit twiddling attached.

Stefan