.==(_:_:)

A vector mask with the result of a pointwise equality comparison.

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

Equivalent to:

var result = SIMDMask<SIMD3<Int8>>()
for i in result.indices {
  result[i] = a[i] == b[i]
}