[PATCH] Loop Vectorizer doesn't use %zmm registers on targets supporting AVX512.

Zinovy Nis zinovy.nis at gmail.com
Fri Mar 14 08:22:58 PDT 2014

Thanks. Done. Plz see my update.

2014-03-14 18:21 GMT+04:00 Andrea Di Biagio <Andrea_DiBiagio at sn.scee.net>:

>   Hi zinovy,
>   Could you please add a test for it?
>   You should be able to generate a test starting from your original
> example and building it with -emit-llvm. The resulting IR can then be
> used/adapted to create an 'opt' test that verifies that the body of the
> loop is correctly vectorized.
>   The idea is that your new opt test would RUN opt with flags
> '-mattr=+avx512f' (or -mcpu=knl) and '-loop-vectorize'.
>   You should be able to check that, with your change, the body of the
> vectorized loop now only contains fmul <16 x float> instructions. Before
> your change, it was producing instead a sequence of fmul <8 x float>.
>   I hope this make sense :-)
>   Andrea.
> http://llvm-reviews.chandlerc.com/D3078
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