[PATCH] D143872: [X86][FP16] Combine two steps conversions into direct conversion

[Phoebe Wang via Phabricator via llvm-commits]

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When both v8i64 and v4f16 are not legal in a v8i64->v8f16 conversion, legalizer will breaks it into v8i64->v4i64->v4f32->v8f32->v8f16.

Given we support v4i64->v8f16, we can combine them with a shuffle instruction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143872

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/avx512fp16-cvt.ll
  llvm/test/CodeGen/X86/vec-strict-inttofp-256-fp16.ll

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