[llvm] [X86] SimplifyDemandedBitsForTargetNode - add handling for VPMADD52L/VPMADD52H (PR #155494)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

@houngkoungting is currently working on #155386

Building on this - please can you handle the vpmadd52(x,0,y) -> y fold in SimplifyDemandedBitsForTargetNode? If the lower 52bits of either multiplicand are known zero.

https://github.com/llvm/llvm-project/pull/155494