DavidSpickett wrote:

I can confirm that AArch64 Neon and SVE work as stated:

> B2.9.3.2 Endianness in SIMD operations
> 
> ...The four elements appear in the register in array order, with the
> lowest indexed element fetched from the lowest address. The order of bytes in 
> the elements depends on the endianness
> configuration, as shown in Figure B2-3. Therefore, the **order of the 
> elements in the registers is the same regardless of the
> endianness configuration**.
> 
> B2.9.3.3 Endianness in SVE operations
> 
> Rules on byte and element order of SIMD load and store instructions apply to 
> SVE load and store instructions.

Do we know what vector extension s390x has and what order it uses?

https://github.com/llvm/llvm-project/pull/157198
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