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We weren't checking the sign of the floating point immediate before translating it to "fmov sD, wzr". Similarly for D-regs. Technically "movi vD.2s, #0x80, lsl #24" would work most of the time, but it's not a blessed alias (and I don't think it should be since people expect writing sD to zero out the high lanes, and there's no dD equivalent). So an error it is. rdar://20455398 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234372 91177308-0d34-0410-b5e6-96231b3b80d8
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