Hello,
I was wondering, how does Sleef decides which Instruction Set to use?
For instance, if I call it on __m256 will AVX be automatically used?
If yet, will it use AVX or AVX2?
Namely, just more information.
I for once would be happy for a mode where __m128 goes to SSE4 Code Path and __m256 goes to AVX2 code path. Could that be configureable?
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SLEEF has a dispatcher that automatically detects available vector extensions and chooses the best one.
You can just call Sleef_sind2_u10, for example, and it automatically use AVX2 if available.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hello,
I was wondering, how does Sleef decides which Instruction Set to use?
For instance, if I call it on
__m256will AVX be automatically used?If yet, will it use AVX or AVX2?
Namely, just more information.
I for once would be happy for a mode where
__m128goes to SSE4 Code Path and__m256goes to AVX2 code path. Could that be configureable?Hello,
SLEEF has a dispatcher that automatically detects available vector extensions and chooses the best one.
You can just call Sleef_sind2_u10, for example, and it automatically use AVX2 if available.
Is it on Run Time or decided at Compile Time?
Thank You.
Last edit: Royi 2018-02-19
It is decided when it is run.
Please see :
http://sleef.org/additional.xhtml#dispatcher
Last edit: Naoki Shibata 2018-02-19