SIMD.js has been taken out of active development in TC39 and removed from Stage 3. It is not being pursued by web browsers for implementation anymore. SIMD operations exposed to the web are under active development within WebAssembly, with operations based on the SIMD.js operations.
SIMD.%type%.equal() method returns a selection mask with values depending on a strict equality comparison (
a === b) in each lane.
SIMD.Float32x4.equal(a, b) SIMD.Float64x2.equal(a, b) SIMD.Int8x16.equal(a, b) SIMD.Int16x8.equal(a, b) SIMD.Int32x4.equal(a, b) SIMD.Uint8x16.equal(a, b) SIMD.Uint16x8.equal(a, b) SIMD.Uint32x4.equal(a, b)
- An instance of a SIMD type.
- Another instance of a SIMD type.
A selection mask (of type
Bool8x16 depending on the size). The lane values of the mask are either
false depending on the result of
a === b.
SIMD.%type%.equal method is one of the SIMD comparison operations and does not give you back the values of the equality comparison of two instances directly. Instead, a selection mask with Boolean values is returned.
Selecting equal lanes from two vectors
In this example, two SIMD
Float32x4 data types are compared against equality of their lane values and a selection mask gets created based on the result. This selection mask is then used to select the equal values into a new
Float32x4. At the lane positions where the vectors
b have no equal values, the result vector uses the
zero vector and fills the lanes with
var a = SIMD.Float32x4(1, 2, 3, 9); var b = SIMD.Float32x4(1, 4, 7, 9); var mask = SIMD.Float32x4.equal(a,b); // Bool32x4[true, false, false, true] var zero = SIMD.Float32x4(0, 0, 0, 0); var result = SIMD.Float32x4.select(mask, a, zero); // Float32x4[1, 0, 0, 9]
The definition of 'SIMDConstructor.equal' in that specification.