[fpc-devel] Problems with MM types (__m128 etc).

Jonas Maebe jonas at freepascal.org
Wed Apr 6 23:00:10 CEST 2022

On 06/04/2022 22:58, J. Gareth Moreton via fpc-devel wrote:
> On 06/04/2022 21:16, Jonas Maebe via fpc-devel wrote:
>> On 06/04/2022 19:20, J. Gareth Moreton via fpc-devel wrote:
>>> I recently made a merge request that initally just fixed the 
>>> incorrect memory alignment for __m128 and similar types, but doing so 
>>> revealed a whole plethora of other bugs.  First, when I fixed it, 
>>> __m128 etc were no longer recognised as a valid SIMD or aggregate 
>>> type due to the wrong alignment field being checked at one point, and 
>>> some tests with vectorcall revealed some bad code being generated in 
>>> places.
>> Note that the ado_IsVector flag until now was only added to be able to 
>> define arrays as vector types for the purpose of the LLVM backend. 
>> There is absolutely no support for vector types based on this flag 
>> anywhere in the code generator.
> I used it because it was easy to hot-swap the constructor in the 
> definition of __m128 and the like, and it was a quick and convenient way 
> to ensure the alignment was correct.

I mainly meant that some of the bugs you are encountering may be because 
of that change itself, because it has not been tested/used at all with 
the regular code generator before.


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