[PATCH] D98659: [MachineCopyPropagation] Do more backward copy propagations

Thu Mar 18 05:01:36 PDT 2021

yshui added a comment.

In D98659#2634206 <https://reviews.llvm.org/D98659#2634206>, @lkail wrote:

>> Thanks for your review. There is a test case in https://reviews.llvm.org/D98401, which is quite big. I wasn't able to reduce it further, is it OK to just include that as test case?
>
> Have you tried using bugpoint to reduce it further, or writing MIR test manually?

I am not sure how to use bugpoint for this, as this is not a miscompilation, bad codegen, or crash. But I did try using llvm-reduce, which did help, but the resulting IR is still pretty big.

I find it difficult to manually create the kind of MIR pattern I want.

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https://reviews.llvm.org/D98659