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As discussed in D39204, this is effectively a revert of rL265521 which required nnan to vectorize sqrt libcalls based on the old LangRef definition of llvm.sqrt. Now that the definition has been updated so the libcall and intrinsic have the same semantics apart from potentially setting errno, we can remove the nnan requirement. We have the right check to know that errno is not set: if (!ICS.onlyReadsMemory()) ...ahead of the switch. This will solve https://bugs.llvm.org/show_bug.cgi?id=27435 assuming that's being built for a target with -fno-math-errno. Differential Revision: https://reviews.llvm.org/D39642 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317519 91177308-0d34-0410-b5e6-96231b3b80d8
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