054c23d78f
Improve cost-modeling for x86 __fp16 conversions so the SLPVectorizer transforms the patterns: - Override `X86TTIImpl::getStoreMinimumVF` to report a minimum VF of 4 (SSE register can hold 4xfloat converted/stored to 4xf16) this is necessary as fp16 stores are neither modeled as trunc-stores nor can we mark direct Xxfp16 stores as legal as we generally expand fp16 operations). - Add missing cost entries to `X86TTIImpl::getCastInstrCost` conversion from/to fp16. Note that conversion from f64 to f16 is not supported by an X86 instruction.
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