Mystery instructions

Mystery instructions

[jacob navia]

Hi
The GNU assembler supports two instructions for the T-Head risk machines called:

th.ipop
th.ipush

With no arguments. These instructions (they are no macros or aliases) are UNDOCUMENTED in the T-Head instruction manuals that I have, and a google search yields absolutely nothing.

Can anyone here point me to some documentation that describes what these instructions do?

Thanks in advance.

Re: Mystery instructions

[Alex Huang]

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Hi,

These instructions looks to be part of the T-head vendor extension instruction set. With the spec here https://github.com/T-head-Semi/thead-extension-spec. 

Best regards
Alex

> On Jan 23, 2024, at 8:42 AM, jacob navia via Gcc <gcc@gcc.gnu.org> wrote:
> 
> Hi
> The GNU assembler supports two instructions for the T-Head risk machines called:
> 
> th.ipop
> th.ipush
> 
> With no arguments. These instructions (they are no macros or aliases) are UNDOCUMENTED in the T-Head instruction manuals that I have, and a google search yields absolutely nothing.
> 
> Can anyone here point me to some documentation that describes what these instructions do?
> 
> Thanks in advance.

Re: Mystery instructions

[jacob navia]

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Well, the pdf I have dates from 2022, but it hasn’t any reference to those instructions. But that link works, THANKS A LOT!
I will now use that documentation.

Jacob

P.S. I am going through EACH one of the instructions in the instruction table, and documenting what it does, syntax, abstract arguments and mode of operation.

> Le 23 janv. 2024 à 15:16, Alex Huang <huangalex409@gmail.com> a écrit :
> 
> Hi,
> 
> These instructions looks to be part of the T-head vendor extension instruction set. With the spec here https://github.com/T-head-Semi/thead-extension-spec. 
> 
> Best regards
> Alex
> 
>> On Jan 23, 2024, at 8:42 AM, jacob navia via Gcc <gcc@gcc.gnu.org> wrote:
>> 
>> Hi
>> The GNU assembler supports two instructions for the T-Head risk machines called:
>> 
>> th.ipop
>> th.ipush
>> 
>> With no arguments. These instructions (they are no macros or aliases) are UNDOCUMENTED in the T-Head instruction manuals that I have, and a google search yields absolutely nothing.
>> 
>> Can anyone here point me to some documentation that describes what these instructions do?
>> 
>> Thanks in advance.