[llvm] [X86] Add custom operation actions for f16: FABS, FNEG, and FCOPYSIGN (PR #128877)

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StarOne01 wrote:

Just out of curiosity, what happened when i change the default (Promote) to Custom, i understand we override the default and making a custom lower, that means we already have a implementation of custom lowering somewhere?


https://github.com/llvm/llvm-project/pull/128877