refactor: fix f32 emulation

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/spencef/lib/main.js

@@ -44,6 +44,9 @@ var polyvalB = require( './polyval_b.js' );
 // VARIABLES //
 
 var PI2O6 = f32( 1.64493406684822643647 ); // π^2 / 6
+var ZERO = f32( 0.0 );
+var HALF = f32( 0.5 );
+var ONE = f32( 1.0 );
 
 
 // MAIN //
@@ -89,37 +92,37 @@ function spencef( x ) {
 	var y;
 	var z;
 
+	x = f32( x );
 	if ( isnanf( x ) || x < 0.0 ) {
 		return NaN;
 	}
 	if ( x === 1.0 ) {
-		return 0.0;
+		return ZERO;
 	}
 	if ( x === 0.0 ) {
 		return PI2O6;
 	}
 	flg = 0;
 	if ( x > 2.0 ) {
-		x = f32( 1.0 / f32( x ) );
+		x = f32( ONE / x );
 		flg |= 2;
 	}
 	if ( x > 1.5 ) {
-		w = f32( 1.0 / f32( x ) ) - 1.0;
+		w = f32( f32( ONE / x ) - ONE );
 		flg |= 2;
 	} else if ( x < 0.5 ) {
 		w = f32( -x );
 		flg |= 1;
 	} else {
-		w = f32( x ) - 1.0;
+		w = x - ONE;
 	}
-
 	y = f32( -w * f32( f32( polyvalA(w) ) / f32( polyvalB(w) ) ) );
 	if ( flg & 1 ) {
-		y = f32( PI2O6 - f32( lnf( x )*lnf( 1.0-x ) ) - y );
+		y = f32( PI2O6 - f32( lnf( x )*lnf( ONE-x ) ) - y );
 	}
 	if ( flg & 2 ) {
 		z = lnf( x );
-		y = -f32( f32( 0.5*z*z ) + y );
+		y = -f32( f32( HALF*z*z ) + y );
 	}
 	return y;
 }