craig.topper added inline comments. ================ Comment at: lib/CodeGen/CGBuiltin.cpp:6304 @@ +6303,3 @@ + Indices[i] = i; + Ops[2] = CGF.Builder.CreateShuffleVector(Ops[2], Ops[2], + makeArrayRef(Indices, NumElts), ---------------- delena wrote: > craig.topper wrote: > > delena wrote: > > > What code do you receive at the end? There is no shuffle instruction in > > > the architecture for mask vector. > > That's not really a shuffle. It's an extract subvector, but the IR doesn't > > have a real instruction for that. > > > > It's needed so we can go from i8 -> v8i1 -> v2i1/v4i1. > I understand. I just wanted to be sure that you receive only one "kmov %edi, > %k1" at the end. Yes, only one "kmov %edi, %k1" was generated.
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