refactor: use standalone constants

Author: gururaj1512

lib/node_modules/@stdlib/number/float16/base/from-word/lib/main.js

@@ -23,17 +23,17 @@
 var NINF = require( '@stdlib/constants/float16/ninf' );
 var PINF = require( '@stdlib/constants/float16/pinf' );
 var FLOAT16_EXPONENT_BIAS = require( '@stdlib/constants/float16/exponent-bias' );
+var FLOAT16_SIGN_MASK = require( '@stdlib/constants/float16/sign-mask' );
+var FLOAT16_EXPONENT_MASK = require( '@stdlib/constants/float16/exponent-mask' );
+var FLOAT16_SIGNIFICAND_MASK = require( '@stdlib/constants/float16/significand-mask' );
+var FLOAT16_NUM_SIGNIFICAND_BITS = require( '@stdlib/constants/float16/num-significand-bits' );
 var pow = require( '@stdlib/math/base/special/pow' );
 
 
 // VARIABLES //
 
-var SIGN_MASK = 0x8000;     // 0x8000 = 32768 => 1 00000 0000000000
-var EXPONENT_MASK = 0x7C00; // 0x7C00 = 31744 => 0 11111 0000000000
-var MANTISSA_MASK = 0x03FF; // 0x03FF = 1023 => 0 00000 1111111111
-
-var NUM_MANTISSA_BITS = 10; // Number of mantissa bits in float16
-var MAX_EXPONENT = 31;      // Maximum exponent value
+var MAX_EXPONENT = 31;                              // Maximum exponent value
+var SUBNORMAL_EXPONENT = 1 - FLOAT16_EXPONENT_BIAS; // Minimum exponent for subnormal numbers
 
 
 // MAIN //
@@ -57,13 +57,13 @@ function fromWord( word ) {
 	var f16;
 
 	// Extract sign bit (bit 15)
-	sign = ( word & SIGN_MASK ) >>> 15;
+	sign = ( word & FLOAT16_SIGN_MASK ) >>> 15;
 
 	// Extract exponent (bits 14-10)
-	exponent = ( word & EXPONENT_MASK ) >>> NUM_MANTISSA_BITS;
+	exponent = ( word & FLOAT16_EXPONENT_MASK ) >>> FLOAT16_NUM_SIGNIFICAND_BITS;
 
 	// Extract mantissa (bits 9-0)
-	mantissa = word & MANTISSA_MASK;
+	mantissa = word & FLOAT16_SIGNIFICAND_MASK;
 
 	// Handle special cases
 	if ( exponent === MAX_EXPONENT ) {
@@ -85,7 +85,7 @@ function fromWord( word ) {
 			return 0.0;
 		}
 		// Subnormal number: (-1)^sign × 2^(-14) × (0.mantissa)
-		f16 = pow( 2.0, -14 ) * ( mantissa / 1024.0 );
+		f16 = pow( 2.0, SUBNORMAL_EXPONENT ) * ( mantissa / 1024.0 );
 		if ( sign ) {
 			return -f16;
 		}