[llvm] r238918 - AVX-512: VSHUFPD instruction selection - code improvements

[Demikhovsky, Elena]

Hi Chandler,
          >>  I re-generated the previously deleted test file test/CodeGen/X86/vector-shuffle-512-v8.ll and put it back into repository.
         > I don't understand why you are continuing to use the other tests though?

 The vector-shuffle-512-v16.ll has only 4 tests. How do I check all other patterns without “other tests”?
>>As far I understand, the vector-shuffle-512-v8.ll does not check correctness of the shuffles, it just checks that noting fails.
> That is pretty clearly not the case. The test is checking for specific instruction sequences on each pattern.

>>And it should be re-generated after each optimization, right?
> Yes, and most specifically the diff should show exactly what the change entailed.
What about vector-shuffle-512-v32.ll? You don’t want to generate 32! permutations, right?

-           Elena
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