encoding: optimize ieee754_binary64

test262: 19.11% | 🧪 50032 | 🤠 9559 | ❌ 3068 | 💀 19121 | 🏗️ 486 | 💥 425 | ⏰ 6 | 📝 17367

compiler/encoding.js

@@ -142,12 +142,20 @@ export const read_unsignedLEB128 = _input => {
 };
 
 // ieee 754 binary64
-// const ieee754Cache = {};
-// export const ieee754_binary64 = value => {
-// if (ieee754Cache[value]) return ieee754Cache[value];
-// return ieee754Cache[value] = [...new Uint8Array(new Float64Array([ value ]).buffer)];
-// };
-export const ieee754_binary64 = value => [...new Uint8Array(new Float64Array([ value ]).buffer)];
+const ieee754Buffer = new Float64Array(1);
+const ieee754Cache = {};
+export const ieee754_binary64 = value => {
+ if (value === 0) {
+ if (1 / value === -Infinity) return [ 0, 0, 0, 0, 0, 0, 0, 128 ]; // -0
+ return [ 0, 0, 0, 0, 0, 0, 0, 0 ]; // +0
+ }
+
+ if (ieee754Cache[value]) return ieee754Cache[value].slice();
+
+ ieee754Buffer[0] = value;
+ return ieee754Cache[value] = [...new Uint8Array(ieee754Buffer.buffer)];
+};
+
 export const read_ieee754_binary64 = buffer => new Float64Array(new Uint8Array(buffer).buffer)[0];
 
 

package.json

@@ -1,7 +1,7 @@
 {
  "name": "porffor",
  "description": "a basic experimental wip aot optimizing js -> wasm engine/compiler/runtime in js",
- "version": "0.18.40+9c2421a79",
+ "version": "0.18.41+a97365a88",
  "author": "CanadaHonk",
  "license": "MIT",
  "scripts": {},

runner/index.js

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 import fs from 'node:fs';
-globalThis.version = '0.18.40+9c2421a79';
+globalThis.version = '0.18.41+a97365a88';
 
 // deno compat
 if (typeof process === 'undefined' && typeof Deno !== 'undefined') {