We're looking for a person or people to help audit MDN to find places we could speed up. Is this you or someone you know? Check out the RFP: https://mzl.la/2IHcMiE


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%.shuffle() method creates a new SIMD data type instance with the lane values shuffled.


SIMD.Float32x4.shuffle(a, b, s0, s1, s2, s3)
SIMD.Float64x2.shuffle(a, b, s0, s1)

SIMD.Int16x8.shuffle(a, b, s0, s1, s2, s3, s4, s5, s6, s7)
SIMD.Int32x4.shuffle(a, b, s0, s1, s2, s3)

SIMD.Uint16x8.shuffle(a, b, s0, s1, s2, s3, s4, s5, s6, s7)
SIMD.Uint32x4.shuffle(a, b, s0, s1, s2, s3)


An instance of a SIMD type to be shuffled.
Another instance of a SIMD type to be shuffled.
Concatenated index of a and b for lane s0-s15.

Return value

A new SIMD data type with the lane values shuffled.


The static SIMD.%type%.shuffle() method shuffles two SIMD data types into one new SIMD data type.

SIMD shuffle operation


Shuffling a Float32x4

var a = SIMD.Float32x4(1, 2, 3, 4);
var b = SIMD.Float32x4(5, 6, 7, 8);

SIMD.Float32x4.shuffle(a, b, 1, 5, 7, 2);
// Float32x4[2,6,8,3]


Specification Status Comment
The definition of 'SIMD.shuffle' in that specification.
Obsolete Initial definition.

Browser compatibility

Experimental SIMD.js has been removed from browsers. It's still available in Firefox Nightly, but will be removed in favor of a SIMD implementation in WebAssembly. See also bug 1416723.

See also

Document Tags and Contributors

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