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This patch teaches X86FastISel how to select intrinsic 'convert_from_fp16' and intrinsic 'convert_to_fp16'. If the target has F16C, we can select VCVTPS2PHrr for a float-half conversion, and VCVTPH2PSrr for a half-float conversion. Differential Revision: http://reviews.llvm.org/D7673 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230043 91177308-0d34-0410-b5e6-96231b3b80d8
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