Naši dobrovolníci ještě tento článek do jazyka Čeština nepřeložili. Přidejte se a pomozte nám tuto práci dokončit!
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 SIMD.Bool8x16 data type is a 128-bit vector divided into 16 lanes storing boolean values.
Syntax
SIMD.Bool8x16(s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13,s14,s15);
Parameters
s[0-15]Optional- A boolean specifying the value of the lane. Defaults to
false.
Constructor functions
In addition to the simple creator function, the SIMD API provides the following constructor functions:
SIMD.Bool8x16.splat()- Creates an Bool8x16 with all lanes set to a given value.
Note: SIMD types don't work with new, as SIMD values are no "boxed" objects (comparable to String(s) vs. new String(s), which creates a String object).
var v = new SIMD.Bool8x16(true,true,true,true,true,true,true,true,false,false,false,false,false,false,false.false); // TypeError: SIMD.Bool8x16 is not a constructor var w = new SIMD.Bool8x16.splat(true); // TypeError: SIMD.Bool8x16.splat is not a constructor
Instead, you just write:
var v = SIMD.Bool8x16(true,true,true,true,true,true,true,true,false,false,false,false,false,false,false,false); var w = SIMD.Bool8x16.splat(true);
Operations
To actually do something with SIMD types, SIMD operations are needed that work on SIMD data types.
Checking SIMD types
SIMD.Bool8x16.check()- Returns a new Bool8x16 if the parameter is a valid Bool8x16 data type. Throws a
TypeErrorotherwise.
Accessing and mutating lanes
SIMD.Bool8x16.extractLane()- Returns the value of the given lane.
SIMD.Bool8x16.replaceLane()- Returns a new Bool8x16 with the given lane value replaced.
-
Boolean operations
SIMD.Bool8x16.allTrue()- Checks if all lanes hold a
truevalue. SIMD.Bool8x16.anyTrue()- Checks if any of the lanes hold a
truevalue.
Bitwise logical operations
SIMD.Bool8x16.and()- Returns a new Bool8x16 with the logical AND of the lane values (
a & b). SIMD.Bool8x16.or()- Returns a new Bool8x16 with the logical OR of the lane values (
a | b). SIMD.Bool8x16.xor()- Returns a new Bool8x16 with the logical XOR of the lane values (
a ^ b). SIMD.Bool8x16.not()- Returns a new Bool8x16 with lane with the logical NOT of the lane values (
~a).
SIMD prototype
The following methods and properties are installed on the SIMD.Bool8x16.prototype.
SIMD.Bool8x16.prototype.constructor- Specifies the function that creates a SIMD object's prototype.
SIMD.Bool8x16.prototype.toLocaleString()- Returns a localized string representing the SIMD type and its elements. Overrides the
Object.prototype.toLocaleString()method. SIMD.Bool8x16.prototype.toString()- Returns a string representing the SIMD type and its elements. Overrides the
Object.prototype.toString()method. SIMD.Bool8x16.prototype.valueOf()- Returns the primitive value of a SIMD object.
SIMD.Bool8x16.prototype.toSource()- Returns a string representing the source code of the object. Overrides the
Object.prototype.toSource()method.
Examples
Constructing a Bool8x16
SIMD.Bool8x16(true,true,true,true,true,true,true,true,false,false,false,false,false,false,false, false); // Bool8x16[true,true,true,true,true,true,true,true,false,false,false,false,false,false,false,false] SIMD.Bool8x16(true,false); // Bool8x16[false,false,false,false,false,false,false,false,false,false,false,false,false,false,false,false] SIMD.Bool8x16(); // Bool8x16[false,false,false,false,false,false,false,false,false,false,false,false,false,false,false]
Specifications
| Specification | Status | Comment |
|---|---|---|
| SIMD The definition of 'Bool8x16' 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 |