[Libre-soc-bugs] [Bug 1229] fosdem2024 llvm simple-v

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1229

--- Comment #13 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #12)
> the whole point of autovectorization is to automatically convert *scalar
> code* to vectorized code, so any way we express SV operations, that's manual
> vectorization, so the autovectorizer doesn't generally do anything with the
> manually vectorized code.

autovectorization is what converts loops like:
for(int i = 0; i < 8; i++)
    a[i] = b[i] + c[i];

to:
*(vec8 *)a = *(vec8 *)b + *(vec8 *)c;

if you give it already vectorized code (aka. basically any code using SV vector
syntax), it will just not change it.

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