[PATCH] D60852: Fix for bug 41512: lower INSERT_VECTOR_ELT(ZeroVec, 0, Elt) to SCALAR_TO_VECTOR(Elt) for all SSE flavors

[Serge Preis via Phabricator via llvm-commits]

Serge_Preis added a comment.

In D60852#1471378 <https://reviews.llvm.org/D60852#1471378>, @RKSimon wrote:

> Your test cases need to be a lot simpler - I'd recommend looking at buildvec-insertvec.ll and possibly adding your tests to that file instead of adding this new file.


The problem is that in tiny kernel llvm behaves as I expect it to, while in a loop it underperforms: https://gcc.godbolt.org/z/PljujX -- compare Sum2 and Loop() code generation.
I will do my best to minimize the case.

> You will need to use the utils/update_llc_test_checks.py script to autogenerate your codegen checks as well.

Ok, I will look into this.


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D60852