For each SIMD vector type, several words are defined, where type is the type in question:

Word	Stack effect	Description
type-with	( x -- simd-array )	creates a new instance where all components are set to a single scalar
type-boa	( ... -- simd-array )	creates a new instance where components are read from the stack
type-cast	( simd-array -- simd-array' )	creates a new SIMD array where the underlying data is taken from another SIMD array, with no format conversion
>type	( seq -- simd-array )	creates a new instance initialized with the elements of an existing sequence, which must have the correct length
type{	type{ elements... }	parsing word defining literal syntax for an SIMD vector; the correct number of elements must be given

To actually perform vector arithmetic on SIMD vectors, use Vector operations words.

See also
C type specifiers