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> On Mar 6, 2018, at 4:25 PM, Chris Lattner via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > > >> On Mar 6, 2018, at 7:23 AM, Sanjay Patel via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote: >> >> I need to review the last thread about undef/poison (or someone who knows current status of that can reply), but

> On Mar 6, 2018, at 7:23 AM, Sanjay Patel via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > I need to review the last thread about undef/poison (or someone who knows current status of that can reply), but this would seem to come down to whether undef applies to the entire value or the individual bits? > Ie, in your example the sign bit will never be set unless all of the