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SIMD.%type%.reciprocalApproximation()

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%.reciprocalApproximation() method returns a new instance with an approximation of the reciprocal lane values (1 / x).

Syntax

SIMD.Float32x4.reciprocalApproximation(t)
SIMD.Float64x2.reciprocalApproximation(t)

Parameters

t
An instance of a corresponding SIMD type.

Return value

A new corresponding SIMD data type with reciprocal lane values (1 / x).

Description

The SIMD.%type%.reciprocalApproximation() is an approximation of the reciprocal of the lane values. This means that an estimation of the reciprocal of a number is calculated and that there can be a small amount of errors. The Newton-Raphson division, for example, is one of the fast division methods that calculates an estimation. See also this ARM/NEON FAQ article.

Examples

var a = SIMD.Float32x4(1, 2, 3, 4);
SIMD.Float32x4.reciprocalApproximation(a);
// Float32x4[1, 0.5, 0.3333333432674408, 0.25]

var b = SIMD.Float64x2(0, Infinity);
SIMD.Float64x2.reciprocalApproximation(b);
// Float64x2[Infinity, 0]

Specifications

Specification Status Comment
SIMD
The definition of 'SIMDConstructor.reciprocalApproximation' 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
 Last updated by: fscholz,