.^(_:_:)

A vector mask that is the pointwise exclusive or of the inputs.

static func .^ (a: SIMDMask<Storage>, b: SIMDMask<Storage>) -> SIMDMask<Storage>

Equivalent to:

var result = SIMDMask<SIMD16<Int8>>()
for i in result.indices {
  result[i] = a[i] != b[i]
}