[llvm] [X86] Recognise VPMADD52L pattern with AVX512IFMA/AVXIFMA (#153787) (PR #156714)

[Justin Riddell via llvm-commits]

Arghnews wrote:

> Please can you add a couple of tests for odd types that satisfy the knownbits (<1 x i64> and <6 x i64> might be good examples)

Will do. Currently it will hit asserts or crash with "Do not know how to custom type legalize this operation" for these. Is the intention here just to bail out on hitting an odd length type - as opposed to doing something to widen the input type?

https://github.com/llvm/llvm-project/pull/156714