remove SubArray constructor

Author: tgymnich

lib/mps/matrix.jl

@@ -136,32 +136,6 @@ function MPSMatrix(arr::MtlArray{T,3}) where T
     return obj
 end
 
-
-"""
-    MPSMatrix(arr::MtlMatrix)
-
-Metal matrix representation used in Performance Shaders.
-
-Note that this results in a transposed view of the input,
-as Metal stores matrices row-major instead of column-major.
-"""
-function MPSMatrix(arr::SubArray{T,2,MtlArray{T,3}}) where T
-    n_cols, n_rows = size(arr)
-    row_bytes = sizeof(T)*n_cols
-    index = parentindices(arr)[3]
-    offset = row_bytes * n_cols * (index-1)
-    desc = MPSMatrixDescriptor(n_rows, n_cols, row_bytes, T)
-    mat = @objc [MPSMatrix alloc]::id{MPSMatrix}
-    obj = MPSMatrix(mat)
-    finalizer(release, obj)
-    @objc [obj::id{MPSMatrix} initWithBuffer:parent(arr).buffer::id{MTLBuffer}
-                              offset:offset::NSUInteger
-                              descriptor:desc::id{MPSMatrixDescriptor}]::id{MPSMatrix}
-    return obj
-end
-
-### parentindices(A)
-
 #
 # matrix multiplication
 #