@petamoriken/float16 - npm Package Compare versions

Comparing version 3.8.1 to 3.8.2

browser/float16.js

@@ -1,2 +0,2 @@
-/*! @petamoriken/float16 v3.8.1 | MIT License - https://github.com/petamoriken/float16 */
+/*! @petamoriken/float16 v3.8.2 | MIT License - https://github.com/petamoriken/float16 */
 
@@ -105,3 +105,10 @@ var float16 = (function (exports) {
   const ArrayPrototypeSymbolIterator = uncurryThis(NativeArrayPrototypeSymbolIterator);
-  const MathTrunc = Math.trunc;
+  const {
+    abs: MathAbs,
+    floor: MathFloor,
+    log2: MathLog2,
+    pow: MathPow,
+    sign: MathSign,
+    trunc: MathTrunc,
+  } = Math;
   const NativeArrayBuffer = ArrayBuffer;
@@ -321,49 +328,54 @@ const ArrayBufferIsView = NativeArrayBuffer.isView;
 
-  const buffer = new NativeArrayBuffer(4);
-  const floatView = new NativeFloat32Array(buffer);
-  const uint32View = new NativeUint32Array(buffer);
-  const baseTable = new NativeUint32Array(512);
-  const shiftTable = new NativeUint32Array(512);
-  for (let i = 0; i < 256; ++i) {
-    const e = i - 127;
-    if (e < -27) {
-      baseTable[i]         = 0x0000;
-      baseTable[i | 0x100] = 0x8000;
-      shiftTable[i]         = 24;
-      shiftTable[i | 0x100] = 24;
-    } else if (e < -14) {
-      baseTable[i]         =  0x0400 >> (-e - 14);
-      baseTable[i | 0x100] = (0x0400 >> (-e - 14)) | 0x8000;
-      shiftTable[i]         = -e - 1;
-      shiftTable[i | 0x100] = -e - 1;
-    } else if (e <= 15) {
-      baseTable[i]         =  (e + 15) << 10;
-      baseTable[i | 0x100] = ((e + 15) << 10) | 0x8000;
-      shiftTable[i]         = 13;
-      shiftTable[i | 0x100] = 13;
-    } else if (e < 128) {
-      baseTable[i]         = 0x7c00;
-      baseTable[i | 0x100] = 0xfc00;
-      shiftTable[i]         = 24;
-      shiftTable[i | 0x100] = 24;
-    } else {
-      baseTable[i]         = 0x7c00;
-      baseTable[i | 0x100] = 0xfc00;
-      shiftTable[i]         = 13;
-      shiftTable[i | 0x100] = 13;
+  function roundTiesToEven(num) {
+    const truncated = MathTrunc(num);
+    const isOdd = truncated % 2 !== 0;
+    const delta = MathAbs(num - truncated);
+    if (delta > 0.5 || delta === 0.5 && isOdd) {
+      return truncated + MathSign(num);
     }
+    return truncated;
   }
+  const f16EMax = 31;
+  const f16EBias = 15;
+  const f16MLen = 10;
+  const f16MMask = 0x3ff;
   function roundToFloat16Bits(num) {
-    floatView[0] =  (num);
-    const f = uint32View[0];
-    const e = (f >> 23) & 0x1ff;
-    return baseTable[e] + ((f & 0x007fffff) >> shiftTable[e]);
+    const absNum = MathAbs( (num));
+    const s =  (num) < 0 || ObjectIs(num, -0) ? 1 : 0;
+    let m, e;
+    if (!NumberIsFinite(absNum)) {
+      m = NumberIsNaN(absNum) ? 0x200 : 0;
+      e = f16EMax;
+    } else {
+      let rawE = MathFloor(MathLog2(absNum));
+      let c = MathPow(2, -rawE);
+      if (absNum * c < 1) {
+        --rawE;
+        c *= 2;
+      }
+      if (absNum * c >= 2) {
+        ++rawE;
+        c /= 2;
+      }
+      if (rawE + f16EBias >= f16EMax) {
+        m = 0;
+        e = f16EMax;
+      } else if (rawE + f16EBias >= 1) {
+        m = roundTiesToEven(((absNum * c) - 1) * 0x400) & f16MMask;
+        e = rawE + f16EBias;
+      } else {
+        m = roundTiesToEven(absNum * 0x1000000) & f16MMask;
+        e = 0;
+      }
+    }
+    return s << 15 | e << f16MLen | m;
   }
+  const buffer = new NativeArrayBuffer(4);
+  const floatView = new NativeFloat32Array(buffer);
+  const uint32View = new NativeUint32Array(buffer);
   const mantissaTable = new NativeUint32Array(2048);
-  const exponentTable = new NativeUint32Array(64);
-  const offsetTable = new NativeUint32Array(64);
   for (let i = 1; i < 1024; ++i) {
     let m = i << 13;
     let e = 0;
-    while((m & 0x00800000) === 0) {
+    while ((m & 0x00800000) === 0) {
       m <<= 1;
@@ -379,2 +391,3 @@ e -= 0x00800000;
   }
+  const exponentTable = new NativeUint32Array(64);
   for (let i = 1; i < 31; ++i) {
@@ -389,2 +402,3 @@ exponentTable[i] = i << 23;
   exponentTable[63] = 0xc7800000;
+  const offsetTable = new NativeUint16Array(64);
   for (let i = 1; i < 64; ++i) {
@@ -396,4 +410,4 @@ if (i !== 32) {
   function convertToNumber(float16bits) {
-    const m = float16bits >> 10;
-    uint32View[0] = mantissaTable[offsetTable[m] + (float16bits & 0x3ff)] + exponentTable[m];
+    const i = float16bits >> 10;
+    uint32View[0] = mantissaTable[offsetTable[i] + (float16bits & 0x3ff)] + exponentTable[i];
     return floatView[0];
@@ -400,0 +414,0 @@ }

package.json

 {
   "name": "@petamoriken/float16",
-  "version": "3.8.1",
+  "version": "3.8.2",
   "description": "IEEE 754 half-precision floating-point for JavaScript",
@@ -76,12 +76,12 @@ "keywords": [
   "devDependencies": {
-    "@babel/cli": "^7.21.5",
-    "@babel/core": "^7.21.8",
-    "@babel/plugin-transform-modules-commonjs": "^7.21.5",
-    "@types/nightwatch": "^2.3.23",
+    "@babel/cli": "^7.22.9",
+    "@babel/core": "^7.22.9",
+    "@babel/plugin-transform-modules-commonjs": "^7.22.5",
+    "@types/nightwatch": "^2.3.24",
     "babel-plugin-replace-import-extension": "^1.1.3",
-    "browserslist": "^4.21.5",
-    "concurrently": "^8.0.1",
-    "eslint": "^8.41.0",
+    "browserslist": "^4.21.9",
+    "concurrently": "^8.2.0",
+    "eslint": "^8.45.0",
     "eslint-plugin-import": "^2.27.5",
-    "eslint-plugin-jsdoc": "^44.2.5",
+    "eslint-plugin-jsdoc": "^46.4.5",
     "espower-cli": "^1.1.0",
@@ -93,7 +93,7 @@ "espower-loader": "^1.2.2",
     "mocha": "^10.2.0",
-    "nightwatch": "^2.6.21",
-    "nightwatch-saucelabs-endsauce": "^2.1.4",
+    "nightwatch": "^3.1.1",
+    "nightwatch-saucelabs-endsauce": "^2.3.1",
     "nyc": "^15.1.0",
     "power-assert": "^1.4.2",
-    "rollup": "^3.23.0",
+    "rollup": "^3.26.3",
     "rollup-plugin-cleanup": "^3.2.1",
@@ -100,0 +100,0 @@ "source-map-support": "^0.5.21"

README.md

@@ -35,3 +35,3 @@ # <a href="https://github.com/petamoriken/float16">float16</a>
   <a href="https://saucelabs.com/u/petamoriken">
-    <img src="https://saucelabs.com/browser-matrix/petamoriken.svg" alt="Sauce Labs browser matrix">
+    <img src="https://app.saucelabs.com/browser-matrix/petamoriken.svg" alt="Sauce Labs browser matrix">
   </a>
@@ -181,3 +181,3 @@ </p>
 for (const value of array) {
-  // 1, 1.099609375, 1.19921875, 1.2998046875
+  // 1, 1.099609375, 1.2001953125, 1.2998046875
   console.log(value);
@@ -184,0 +184,0 @@ }

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Improved metrics

Total package byte prevSize

236112

increased by0.38%

Lines of code

6127

increased by1.02%

No dependency changes