[PATCH] D93594: [X86] Pass to transform amx intrinsics to scalar operation.

Tue Mar 16 04:38:17 PDT 2021

yubing added a comment.

In D93594#2628497 <https://reviews.llvm.org/D93594#2628497>, @nikic wrote:

> It looks like this has caused a compile-time regression at `O0`: https://llvm-compile-time-tracker.com/compare.php?from=9341bcbdc93a251b632ffaa51a84452a7a4a5e4e&to=4f198b0c27b04e830a3069aaf4b39cf203eaae4a&stat=instructions
>
> The cause is probably the computation of DomTree and LoopInfo, even if no AMX intrinsics are present. I think you should be able to easily fix this by not fetching DT/LI from the pass manager, and computing them in the pass instead (only if intrinsics are present).

Thanks, @nikic, I will fix it ASAP. Besides, How could I reproduce the regression?
Eh, I am asking these question because I think I should see if the repression can't be reproduced with my future bugfix.

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