Conditional compilation to detect AVX2
j at j.nl
Tue May 22 19:07:47 UTC 2018
On Tuesday, 22 May 2018 at 18:27:20 UTC, Jeff wrote:
> Here is a little code exemple where I try to do some
> conditional compilation (https://dlang.org/spec/version.html) :
> Is seems 'D_AVX2' is not defined when I pass the '-mattr=+avx2
> -O3' options: is there something wrong in my code ?
No, this is a bug in LDC.
Because LDC doesn't support the core.simd functions (we do
support the types), we don't define D_SIMD.
But looking at the definition of D_AVX and D_AVX2, we should
indeed define them if the compile target supports them.
For your purpose, the workaround is:
(Note: the run.dlang.io machine appears to have a sandybridge
CPU, which does not have AVX2; but you can test with AVX (one)
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