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I don't think there is an intrinsic. This is supported by native IR by looking for something like (and %a, (xor %b, -1)) On Thu, Dec 31, 2015 at 1:25 PM, Sanjay Patel via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Hi Matt - > I think this should either be VPANDN (integer) or VANDNPS (float); there > is no "VPANDNPS". > > On Thu, Dec 31, 2015 at 1:32 PM,

...ikely to ever be desired. There is precedent for encoding the intrinsic property as a query method both within the current memory intrinsic hierarchy itself (the isVolatile() method) and the load/store instruction classes. The way forward with this option would be to: (i) add the method to MemInstrinsic (returning false); then (ii) update all passes, one at a time, to bail-out if isUnorderedAtomic() is true; then (iii) add an intrinsic to the class hierarchy; then (iv) update passes to exploit isUnorderedAtomic() one at a time (v) repeat (iii) & (iv) for each unordered-atomic intrins...