refactor

src/_util/converter.mjs

@@ -14,6 +14,11 @@ import {
   ObjectIs,
 } from "./primordials.mjs";
 
+const f16MLen = 10;
+const f16MMask = 0x3ff;
+const f16EMax = 31;
+const f16EBias = 15;
+
 // base algorithm: https://github.com/feross/ieee754
 // BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource>
 
@@ -33,11 +38,6 @@ function roundTiesToEven(num) {
   return truncated;
 }
 
-const f16EMax = 31;
-const f16EBias = 15;
-const f16MLen = 10;
-const f16MMask = 0x3ff;
-
 /**
  * round a number to a half float number bits
  * @param {unknown} num - double float
@@ -132,7 +132,7 @@ for (let i = 1; i < 64; ++i) {
  * @returns {number} double float
  */
 export function convertToNumber(float16bits) {
-  const i = float16bits >> 10;
-  uint32View[0] = mantissaTable[offsetTable[i] + (float16bits & 0x3ff)] + exponentTable[i];
+  const i = float16bits >> f16MLen;
+  uint32View[0] = mantissaTable[offsetTable[i] + (float16bits & f16MMask)] + exponentTable[i];
   return floatView[0];
 }