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const mem = exports.memory.buffer;
const F32 = new Float32Array(mem);
F32[0] = 31337.777;
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ããŠããã§ãããã ç§ã®ããã«ãããããããã«ã ããšãã°ã WebAssembly.Memory
ã³ã³ã¹ãã©ã¯ã¿ã®memoryDescriptor
åŒæ°ã«ããdata
ãããªããŒã䜿çšãããšã ArrayBuffer
ã¡ã¢ãªãåæåã§ããŸãã
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èŠããããŸãã ãããŠã©ããããããç§ã¯ãã€ãã£ãã®implãæåŸ
ããŠããŸããã ãã®ç®çã®ããã«ãååšããããšã ãã¶ãmemory.read(Float32Array)
ãããªãã®ã§ããããã¡ããŒã¿ãFloat32Array
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JavaScriptãšWebAssemblyã®éã§ããŒã¿ãã³ããŒããããWebAssemblyã«ããŒã¿ãææããããã決å®ããå¿ èŠããããŸãã
ããŒã¿ãã³ããŒããå Žåã¯ã for
ã«ãŒããèªåã§äœæããã®ã§ã¯ãªãã TypedArray.prototype.setïŒïŒã䜿çšã§ããŸãã
let instance = ...;
let myJSArray = new Float32Array(...);
let length = myJSArray.length;
let myWasmArrayPtr = instance.exports.allocateF32Array(length);
let myWasmArray = new Float32Array(instance.exports.memory.buffer, myWasmArrayPtr, length);
// Copy data in to be used by WebAssembly.
myWasmArray.set(myJSArray);
// Process the data in the array.
instance.exports.processF32Array(myWasmArrayPtr, length);
// Copy data out to JavaScript.
myJSArray.set(myWasmArray);
WebAssemblyãããŒã¿ãææããŠããå Žåã¯ã WebAssembly.Memory
ãããã¡ãŒäžã«ãã¥ãŒãäœæãããããJavaScripté¢æ°ã«æž¡ãããšãã§ããŸãã
let instance = ...;
let length = ...;
let myArrayPtr = instance.exports.allocateF32Array(length);
let myArray = new Float32Array(instance.exports.memory.buffer, myArrayPtr, length);
// Use myArray as a normal Float32Array in JavaScript, fill in data, etc.
...
// Process the data in the array.
instance.exports.processF32Array(myArrayPtr, length);
// No need to copy data back to JavaScript, just use myArray directly.
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ãããã¯ããå€ããŠããããžã§ã¯ãã«ãŸã æ°ä»ããŠããªãå Žåã¯ã httpsïŒ//github.com/torch2424/wasmBoyããå§ãããŸãã
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https://github.com/torch2424/wasmBoy/issues/141-ã¡ã¢ãªã®åãæž¡ã
https://github.com/torch2424/wasmBoy/issues/142-ãŒã«ãã®äŒèª¬ïŒã¹ã¯ãªãŒã³ã·ã§ããã§ããã¯ç§ã®ããã«åããŸãïŒ
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WebAssemblyãããŒã¿ãææããŠããå Žåã¯ãWebAssembly.Memoryãããã¡ãŒäžã«ãã¥ãŒãäœæãããããJavaScripté¢æ°ã«æž¡ãããšãã§ããŸãã
éèŠãªæ³šæç¹ã®1ã€ã¯ãWebAssemblyã€ã³ã¹ã¿ã³ã¹ãã¡ã¢ãªãæ¡åŒµãããšãã¡ã¢ãªãããã¡ãžã®ãã¥ãŒãç¡å¹ã«ãªãããšã§ãã WebAssemblyã€ã³ã¹ã¿ã³ã¹ãžã®ãã以éã®åŒã³åºããè¶ ããŠåç¶ãããã¥ãŒãžã®åç §ãä¿åããããšã¯é¿ããŠãã ããã
@binjiããã䜿çšãããšãã«AssemblyScriptåŽã«äœã眮ããæããŠãã ããã æšæºæ©èœã§ã¯ãªãããšã«æ°ã¥ããŸããã
let myWasmArrayPtr = instance.exports.allocateF32Array(length);
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export function allocateF32Array(length: usize): usize {
return memory.allocate(length * sizeof<f32>());
}
memory.free()
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Typed Arraysã䜿çšãããšãWasm Array Bufferã§setïŒïŒã䜿çšããŠãJSåŽããWASMã¡ã¢ãªã«å¹ççã«æžã蟌ãããšãã§ããŸãã
Wasm / ASå ããWasmMemoryã«æžã蟌ã¿ãŸãããç§ã¯ãŸã æšæºã®forã«ãŒãã¢ãããŒãã䜿çšããŠããŸããäŸïŒ https ïŒ
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@fmkangããªãã¯åã«
export function allocateF32Array(length: i32): Float32Array {
return new Float32Array(length);
}
ASåŽãš
let myArray = module.getArray(Float32Array, module.allocateF32Array(length));
JSåŽã§ã¯ãããŒããŒã䜿çš
@ torch2424ã¯ãã@binjiã®ã³ãŒãã§ã¯ãJSåŽã«ãããã let myWasmArrayPtr = instance.exports.allocateF32Array(length)
ååã®é¢æ°åŒã³åºããŠããallocateF32Array
ïŒããããAssembleScriptã§ã³ã³ãã€ã«ïŒWasmã¢ãžã¥ãŒã«ã§ã¯ã ãã®é¢æ°ã¯åœŒã®ã¹ããããã«ãASçµã¿èŸŒã¿é¢æ°ã®äžéšã«ãèšèŒãããŠããªãã®ã§ãèªåã§å®è£
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@dcodeIOããããšãã ããã«ãããé åã®åãæž¡ããç°¡åã«ãªãããã§ãã ããã«æ°ããã³ã¡ã³ããæçš¿ããåã«ãæ éã«å®éšããŸãã ããããé¢æ°ãèªåã®é¢æ°ã«çœ®ãæããåŸãããŒããããšã¢ãžã¥ãŒã«ãã¯ã©ãã·ã¥ããŸãã ã³ã³ãœãŒã«ã¯èšã
astest.html:1 Uncaught (in promise) TypeError: WebAssembly Instantiation: Import #0 module="env" error: module is not an object or function
ASã³ãŒãã®ã©ããã«let a = new Float32Array(10);
ãããªãã®ãæžããšãã¯ã©ãã·ã¥ããããšãããããŸãã
@dcodeIOé
åãåŒïŒ let c: f64[] = [a[0] + b[0], a[1] + b[1]];
ãªã©ã®ãªãã©ã«ã§ã¯ãªãïŒã§åæåããããšããããé
åã®èŠçŽ ïŒ let a: f64[] = [0, 0, 0]; a[0] = 1;
ãlet array = new Array<i32>(); array.push(1);
ãªã©ïŒã«å€ãå²ãåœãŠããããããšãããšãWasmã¢ãžã¥ãŒã«ãã¯ã©ãã·ã¥ããŸãã
æåã¯ãããã¯memory
ãenv
ã«å
¥ããªãããã ãšæã£ãã®ã§ã次ã®ããã«æžããŸããã
var importObject = {
env: { memory: new WebAssembly.Memory({initial:10}) },
imports: { imported_func: arg => console.log(arg) }
};
WebAssembly.instantiate(wasmBinary, importObject).then(...);
ããããåé¡ã¯ãŸã ååšããŠããŸããã ãããããããŸããŸabort
ãäžè¶³ããŠããããšãåå ã§ããããšãããããŸããã ç§éã¯æžããïŒ
env: {
abort(msg, file, line, column) {
console.error("abort called at main.ts:" + line + ":" + column);
}
}
ãŸãã¯åã«env: { abort: function(){} }
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@fmkangã¢ãžã¥ãŒã«ãã€ã³ã¹ã¿ã³ã¹åããããã«AssemblyScriptããŒããŒã䜿çšããŠããªãããã§ãã ããããã¹ãŠãèªåã§å®è£ ããããšãã§ããŸãããããŒããŒã¯ãã¢ããŒãé¢æ°ãªã©ãã¢ãžã¥ãŒã«ã®ãšã¯ã¹ããŒãã«é¢ããåºæ¬çãªæ©èœããã§ã«è¿œå ããŠããŸãã AssemblyScriptã«é¢ããŠä»ã«ãäžæãªç¹ãããããŸããããåé¡è¿œè·¡ã·ã¹ãã ã§ãæ°è»œã«ãåãåããããŠããã ããŸã:)
ã ãããç§ã¯ãã®ãã¯ããã¯ã䜿ã£ãŠã¿ãŸããïŒ
let myArrayPtr = instance.exports.allocateF32Array(length);
let myArray = new Float32Array(instance.exports.memory.buffer, myArrayPtr, length);
// Use myArray as a normal Float32Array in JavaScript, fill in data, etc.
...
// Process the data in the array.
instance.exports.processF32Array(myArrayPtr, length);
ããããç§ã®processF32Arrayé¢æ°ã¯RuntimeError: memory access out of bounds
ãŸãã ç§ã¯ããŒããŒFWIWã䜿çšããŠããŸããã ç§ãè©ŠããŸããïŒ
let myArray = module.getArray(Float32Array, module.allocateF32Array(length));
ããããç§ã®ã¢ãžã¥ãŒã«ã«ã¯ãgetArrayãããªããã©ã®ããã«ååŸããã®ãããããŸããã
WebAssemblyãšã®éã§é åãã³ããŒããæ¹æ³ãæ¢ããŠãããšããããã®ã¹ã¬ããã«åºããããŸããã ä»ã®èª°ã«ãšã£ãŠãã AssemblyScriptãš@ torch2424ã®ã©ã€ãã©ãªas-bindã䜿çšããŠé åãã³ããŒããããšãã§ããŸãã
ãããç§ã®ç°¡åãªãã¹ãã§ãïŒ
AssemblyScript
export function sum(arr: Float64Array): f64 {
let sum: f64 = 0;
for(let i = 0; i < arr.length; i++) {
sum += arr[i];
}
return sum;
}
JavaScriptïŒããŒãïŒ
const { AsBind } = require("as-bind");
const fs = require("fs");
const wasm = fs.readFileSync(__dirname + "/build/optimized.wasm");
const asyncTask = async () => {
const asb = await AsBind.instantiate(wasm);
// Make a large array
console.time('Making array');
let arr = new Float64Array(1e8).fill(1);
console.timeEnd('Making array');
// Find the sum using reduce
console.time('Reduce');
let sum1 = arr.reduce((acc, val) => acc + val, 0);
console.timeEnd('Reduce');
// Find the sum with for loops
console.time('JS For');
let sum2 = 0;
for(let i = 0; i < arr.length; i++) sum2 += arr[i];
console.timeEnd('JS For');
// Find the sum with WebAssembly
console.time('Wasm For');
let sum3 = asb.exports.sum(arr);
console.timeEnd('Wasm For');
console.log(sum1, sum2, sum3);
};
asyncTask();
ç§ã®ãã·ã³ã§ã¯ã次ã®åºåãåŸãããŸããã
Making array: 789.086ms
Reduce: 2452.922ms
JS For: 184.818ms
Wasm For: 2008.482ms
100000000 100000000 100000000
ãã®ã¡ãœããã䜿çšããŠé åãWebAssemblyã«ã³ããŒããå Žåãããªãã®ãªãŒããŒããããããããã«èŠããŸãããåèšãããã³ã¹ãã®ãããæäœã®ãã¬ãŒããªãã«ã¯äŸ¡å€ããããšæ³åã§ããŸãã
ç·šéïŒ
AssemblyScriptããåèšãåé€ããŠãé åã³ããŒã®ã¿ã®å®è¡æéãåé¢ããŸããã
export function sum(arr: Float64Array): f64 {
let sum: f64 = 0;
return sum;
}
ãããŠããã³ãããŒã¯ãåå®è¡ããŸããã
Wasmã®åèšãªã
Making array: 599.826ms
Reduce: 2810.395ms
JS For: 188.623ms
Wasm For: 762.481ms
100000000 100000000 0
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ãŸããChromeãšFFã§ã¯çµæãç°ãªããŸãã
Chrome 81.0.4044.129
js sum: 129.968017578125ms
sum result = 49996811.62100115
js reduce: 1436.532958984375ms
js reduce result = 49996811.62100115
wasm sum: 153.000244140625ms
wasm sum result = 49996811.62100115
wasm reduce: 125.009033203125ms
wasm reduce result = 49996811.62100115
wasm empty: 0.002685546875ms
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// need to know the size in advance, that's OK since the impl makes some init
const fft = new Module.KissFftReal(/*size=*/N);depending on the size anyway
// get view into WASM memory as Float64Array (of size=N in this case)
const input = fft.getInputTimeDataBuffer();
// fill 'input' buffer
// perform transformation, view into WASM memory is returned here (of size=(N + 2) in this case, +2 for Nyquist bin)
const output = fft.transform();
// use transformation result returned in 'output' buffer
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https://stackoverflow.com/questions/65566923/is-there-a-more-efficient-way-to-return-arrays-from-c-to-javascript
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WebAssembly.Memory
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