[LLVMdev] SLP vectorizer on AVX feature (original) (raw)

Frank Winter fwinter at jlab.org
Wed Jul 1 13:33:18 PDT 2015

On 07/01/2015 04:29 PM, Renato Golin wrote:

On 1 July 2015 at 21:22, Frank Winter <fwinter at jlab.org> wrote:

there were two follow-up emails. I only got one... weird...

The issue is solved. The SLP vectorizer has a magic number built into the code which determines the max. vector length to search for. That was set to 128 bits. Increasing it to 256 bits solved the issue. That looks like a simple fix. Is it upstream yet? :)

That's not up to me. There were concerns raised about an increased compile time. https://llvm.org/bugs/show_bug.cgi?id=17170#c8

Frank

For inconsistency reasons it must be '--debug-only=SLP' and the output can be found in one of the follow-up emails. Of course. Maybe we should mean "vectorize" as all of them? Anyway, that's unrelated. cheers, --renato

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