SIMD.fromFloat64x2Bits

SIMD.js已经从TC39中取消了积极的开发，并从第三阶段中删除了。它不再被网页浏览器所追求。暴露在 web 上的SIMD 操作在 WebAssembly 中正处于积极的发展之中, 其操作基于 SIMD. js 操作。

注意：Float64x2类型目前不是SIMD规范草案的一部分。

静态SIMD.%type%.fromFloat64x2Bits()方法使用Float64x2的按位副本创建新的SIMD数据类型。

语法

SIMD.Float32x4.fromFloat64x2Bits(t)

SIMD.Int32x4.fromFloat64x2Bits(t)
SIMD.Int16x8.fromFloat64x2Bits(t)
SIMD.Int8x16.fromFloat64x2Bits(t)

SIMD.Uint32x4.fromFloat64x2Bits(t)
SIMD.Uint16x8.fromFloat64x2Bits(t)
SIMD.Uint8x16.fromFloat64x2Bits(t)

参数

t从（按位）转换的Float64x2 SIMD类型。

返回值

新的SIMD数据类型，其中包含Float64x2的按位副本。

例子

SIMD.Float32x4.fromFloat64x2Bits

var t = SIMD.Float64x2(2.0, 1.875
SIMD.Float32x4.fromFloat64x2Bits(t
// Float32x4[0, 2.0, 0, 1.984375]

SIMD.Int32x4.fromFloat64x2Bits

var t = SIMD.Float64x2(1.0, 2.0
SIMD.Int32x4.fromFloat64x2Bits(t
// Int32x4[0, 1072693248, 0, 1073741824]

SIMD.Int16x8.fromFloat64x2Bits

var t = SIMD.Float64x2(1.0, 2.0
SIMD.Int16x8.fromFloat64x2Bits(t
// Int16x8[0, 0, 0, 16368, 0, 0, 0, 16384]

SIMD.Int8x16.fromFloat64x2Bits

var t = SIMD.Float64x2(1.0, 2.0
SIMD.Int8x16.fromFloat64x2Bits(t
// Int8x16[0,0,0,0,0,0,-16,63,0,0,0,0,0,0,0,64]

规范

SIMD is not yet part of an official standards document or draft. For standardization work and a Polyfill implementation based on typed arrays, see the ecmascript_simd GitHub repository.

浏览器兼容性

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