strided SubArray does not work with SIMD.jl (#529)

Author: Krastanov

src/mul_leftright.jl

@@ -62,6 +62,13 @@ function mul_ordered!(r::SubArray{T,1,P,I2,false}, l::AbstractVector{T}; phases:
     # e.g. when we use `fastcolumn`).
     # The `false` in the SubArray parameters stands for
     # "does not support fast linear indexing".
+    # See the other ::SubArray method below as well.
+    _mul_ordered_nonvec!(r,l; phases=B)
+end
+
+function mul_ordered!(r::SubArray{T,1,P,Tuple{I1, I2},true}, l::AbstractVector{T}; phases::Val{B}=Val(true)) where {T<:Unsigned, B, P, I1<:Any, I2<:AbstractUnitRange}
+    # This method exists because SIMD.jl requires fast linear indexing
+    # that is NOT strided. See the other ::SubArray method above as well.
     _mul_ordered_nonvec!(r,l; phases=B)
 end