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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.

The static SIMD.%type%.swizzle() method creates a new SIMD data type instance with the lane values swizzled (re-ordered).


SIMD.Float32x4.swizzle(t, s0, s1, s2, s3)
SIMD.Float64x2.swizzle(t, s0, s1)

SIMD.Int16x8.swizzle(t, s0, s1, s2, s3, s4, s5, s6, s7)
SIMD.Int32x4.swizzle(t, s0, s1, s2, s3)

SIMD.Uint16x8.swizzle(t, s0, s1, s2, s3, s4, s5, s6, s7)
SIMD.Uint32x4.swizzle(t, s0, s1, s2, s3)


An instance of a SIMD type to be swizzled / re-ordered.
index in t for lanes s0-s15.

Return value

A new SIMD data type with the lane values swizzled (re-ordered).


The static SIMD.%type%.swizzle() method can be used to re-order a SIMD data type.


Swizzling a Float32x4

var t = SIMD.Float32x4(1, 2, 3, 4);

SIMD.Float32x4.swizzle(t, 1, 2, 0, 3);
// Float32x4[2,3,1,4]


Specification Status Comment
The definition of 'SIMD.swizzle' in that specification.
Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support Nightly build No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support Nightly build No support No support No support

See also

Document Tags and Contributors

 Contributors to this page: fscholz, eduardoboucas
 Last updated by: fscholz,