Andrea Di Biagio 3583d23018 [X86][FastIsel] Teach how to select float-half conversion intrinsics.
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
2015-02-20 19:37:14 +00:00
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