Please note, this is a STATIC archive of website developer.mozilla.org from 03 Nov 2016, cach3.com does not collect or store any user information, there is no "phishing" involved.

SIMD.%type%.shiftLeftByScalar()

我们的志愿者还没有将这篇文章翻译为 中文 (简体)加入我们帮助完成翻译!

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The static SIMD.%type%.shiftLeftByScalar() method returns a new instance with the lane values shifted left by a given bit count (a << bits).

Syntax

SIMD.Int8x16.shiftLeftByScalar(a, bits)
SIMD.Int16x8.shiftLeftByScalar(a, bits)
SIMD.Int32x4.shiftLeftByScalar(a, bits)

SIMD.Uint8x16.shiftLeftByScalar(a, bits)
SIMD.Uint16x8.shiftLeftByScalar(a, bits)
SIMD.Uint32x4.shiftLeftByScalar(a, bits)

Parameters

a
An instance of a SIMD type.
bits
Bit count to shift by.

Return value

A new corresponding SIMD data type with the lane values shifted left by a given bit count (a << bits).

Description

The bitwise left shift operation shifts the specified number of bits to the left. Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right.

For example, a bitwise left shift of 5 << 1 results in 1010 which is 10 in decimal.

5  0101
   ----
10 1010

Examples

Bitwise left shift of an Int32x4

var a = SIMD.Int32x4(1, 2, 4, 8);
SIMD.Int32x4.shiftLeftByScalar(a, 1);
// Int32x4[2, 4, 8, 16]

Specifications

Specification Status Comment
SIMD
The definition of 'SIMDConstructor.shiftLeftByScalar' 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

文档标签和贡献者

 此页面的贡献者: fscholz
 最后编辑者: fscholz,