tree dd3031c3f4c9f738ae2025fb92663a1d6a6a26ce
parent 54319a9ff51f01a78b8b975a2eef0b8d52f9efe6
author Pirama Arumuga Nainar <pirama@google.com> 1458828363 +0000
committer Pirama Arumuga Nainar <pirama@google.com> 1458844530 -0700

Remove unsafe AssertZext after promoting result of FP_TO_FP16

Summary:
Some target lowerings of FP_TO_FP16, for instance ARM's vcvtb.f16.f32
instruction, do not guarantee that the top 16 bits are zeroed out.
Remove the unsafe AssertZext and add tests to exercise this.

Reviewers: jmolloy, sbaranga, kristof.beyls, aadg

Subscribers: llvm-commits, srhines, aemerson

Differential Revision: http://reviews.llvm.org/D18426

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264285 91177308-0d34-0410-b5e6-96231b3b80d8