refactor: use FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS in place of 20

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/modf/lib/assign.js

@@ -27,6 +27,7 @@ var PINF = require( '@stdlib/constants/float64/pinf' );
 var FLOAT64_EXPONENT_BIAS = require( '@stdlib/constants/float64/exponent-bias' );
 var FLOAT64_HIGH_WORD_EXPONENT_MASK = require( '@stdlib/constants/float64/high-word-exponent-mask' ); // eslint-disable-line id-length
 var FLOAT64_HIGH_WORD_SIGNIFICAND_MASK = require( '@stdlib/constants/float64/high-word-significand-mask' ); // eslint-disable-line id-length
+var FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS = require( '@stdlib/constants/float64/num-high-word-significand-bits' ); // eslint-disable-line id-length
 
 
 // VARIABLES //
@@ -95,11 +96,11 @@ function modf( x, out, stride, offset ) {
 	low = WORDS[ 1 ];
 
 	// Extract the unbiased exponent from the high word:
-	exp = ((high & FLOAT64_HIGH_WORD_EXPONENT_MASK) >> 20)|0; // asm type annotation
+	exp = ((high & FLOAT64_HIGH_WORD_EXPONENT_MASK) >> FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS)|0; // asm type annotation
 	exp -= FLOAT64_EXPONENT_BIAS|0; // asm type annotation
 
 	// Handle smaller values (x < 2**20 = 1048576)...
-	if ( exp < 20 ) {
+	if ( exp < FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS ) {
 		i = (FLOAT64_HIGH_WORD_SIGNIFICAND_MASK >> exp)|0; // asm type annotation
 
 		// Determine if `x` is integral by checking for significand bits which cannot be exponentiated away...
@@ -126,7 +127,7 @@ function modf( x, out, stride, offset ) {
 		out[ offset + stride ] = 0.0;
 		return out;
 	}
-	i = ALL_ONES >>> (exp-20);
+	i = ALL_ONES >>> ( exp - FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS );
 
 	// Determine if `x` is integral by checking for less significant significand bits which cannot be exponentiated away...
 	if ( (low&i) === 0 ) {

lib/node_modules/@stdlib/math/base/special/modf/manifest.json

@@ -46,7 +46,8 @@
         "@stdlib/constants/float64/pinf",
         "@stdlib/constants/float64/exponent-bias",
         "@stdlib/constants/float64/high-word-exponent-mask",
-        "@stdlib/constants/float64/high-word-significand-mask"
+        "@stdlib/constants/float64/high-word-significand-mask",
+        "@stdlib/constants/float64/num-high-word-significand-bits"
       ]
     },
     {
@@ -66,7 +67,8 @@
         "@stdlib/constants/float64/pinf",
         "@stdlib/constants/float64/exponent-bias",
         "@stdlib/constants/float64/high-word-exponent-mask",
-        "@stdlib/constants/float64/high-word-significand-mask"
+        "@stdlib/constants/float64/high-word-significand-mask",
+        "@stdlib/constants/float64/num-high-word-significand-bits"
       ]
     },
     {
@@ -86,7 +88,8 @@
         "@stdlib/constants/float64/pinf",
         "@stdlib/constants/float64/exponent-bias",
         "@stdlib/constants/float64/high-word-exponent-mask",
-        "@stdlib/constants/float64/high-word-significand-mask"
+        "@stdlib/constants/float64/high-word-significand-mask",
+        "@stdlib/constants/float64/num-high-word-significand-bits"
       ]
     }
   ]

lib/node_modules/@stdlib/math/base/special/modf/src/main.c

@@ -24,6 +24,7 @@
 #include "stdlib/constants/float64/exponent_bias.h"
 #include "stdlib/constants/float64/high_word_exponent_mask.h"
 #include "stdlib/constants/float64/high_word_significand_mask.h"
+#include "stdlib/constants/float64/num_high_word_significand_bits.h"
 
 // 4294967295 => 0xffffffff => 11111111111111111111111111111111
 static const uint32_t ALL_ONES = 4294967295;
@@ -82,11 +83,11 @@ void stdlib_base_modf( const double x, double* integral, double* frac ) {
 	stdlib_base_float64_to_words( x, &high, &low );
 
 	// Extract the unbiased exponent from the high word:
-	exp = ( ( high & STDLIB_CONSTANT_FLOAT64_HIGH_WORD_EXPONENT_MASK ) >> 20 );
+	exp = ( ( high & STDLIB_CONSTANT_FLOAT64_HIGH_WORD_EXPONENT_MASK ) >> STDLIB_CONSTANT_FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS );
 	exp -= ( STDLIB_CONSTANT_FLOAT64_EXPONENT_BIAS );
 
 	// Handle smaller values (x < 2**20 = 1048576)...
-	if( exp < 20 ) {
+	if( exp < STDLIB_CONSTANT_FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS ) {
 		i = ( STDLIB_CONSTANT_FLOAT64_HIGH_WORD_SIGNIFICAND_MASK >> exp );
 
 		// Determine if `x` is integral by checking for significand bits which cannot be exponentiated away...
@@ -111,7 +112,7 @@ void stdlib_base_modf( const double x, double* integral, double* frac ) {
 		*frac = 0.0;
 		return;
 	}
-	i = ALL_ONES >> ( exp - 20 );
+	i = ALL_ONES >> ( exp - STDLIB_CONSTANT_FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS );
 
 	// Determine if `x` is integral by checking for less significant significand bits which cannot be exponentiated away...
 	if ( ( low & i ) == 0 ) {