bench: update random value generation

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
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    status: passed
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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/expf/benchmark/benchmark.js

@@ -30,45 +30,17 @@ var expf = require( './../lib' );
 // MAIN //
 
 bench( pkg, function benchmark( b ) {
-	var len;
 	var x;
 	var y;
 	var i;
 
-	len = 100;
-	x = uniform( len, -50.0, 50.0, {
+	x = uniform( 100, -50.0, 50.0, {
 		'dtype': 'float32'
 	});
 
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		y = expf( x[ i % len ] );
-		if ( isnanf( y ) ) {
-			b.fail( 'should not return NaN' );
-		}
-	}
-	b.toc();
-	if ( isnanf( y ) ) {
-		b.fail( 'should not return NaN' );
-	}
-	b.pass( 'benchmark finished' );
-	b.end();
-});
-
-bench( pkg+'::built-in', function benchmark( b ) {
-	var len;
-	var x;
-	var y;
-	var i;
-
-	len = 100;
-	x = uniform( len, -50.0, 50.0, {
-		'dtype': 'float32'
-	});
-
-	b.tic();
-	for ( i = 0; i < b.iterations; i++ ) {
-		y = Math.exp( x[ i % len ] ); // eslint-disable-line stdlib/no-builtin-math
+		y = expf( x[ i%x.length ] );
 		if ( isnanf( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/math/base/special/expf/benchmark/benchmark.native.js

@@ -39,19 +39,17 @@ var opts = {
 // MAIN //
 
 bench( pkg+'::native', opts, function benchmark( b ) {
-	var len;
 	var x;
 	var y;
 	var i;
 
-	len = 100;
-	x = uniform( len, -50.0, 50.0, {
+	x = uniform( 100, -50.0, 50.0, {
 		'dtype': 'float32'
 	});
 
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		y = expf( x[ i % len ] );
+		y = expf( x[ i%x.length ] );
 		if ( isnanf( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/math/base/special/expf/benchmark/c/native/benchmark.c

@@ -75,13 +75,15 @@ static double tic( void ) {
 }
 
 /**
-* Generates a random number on the interval [0,1).
+* Generates a random number on the interval [min,max).
 *
-* @return random number
+* @param min    minimum value (inclusive)
+* @param max    maximum value (exclusive)
+* @return       random number
 */
-static float rand_float( void ) {
-	int r = rand();
-	return (float)r / ( (float)RAND_MAX + 1.0f );
+static float random_uniform( const float min, const float max ) {
+	float v = (float)rand() / ( (float)RAND_MAX + 1.0f );
+	return min + ( v*(max-min) );
 }
 
 /**
@@ -90,19 +92,19 @@ static float rand_float( void ) {
 * @return elapsed time in seconds
 */
 static double benchmark( void ) {
-	double elapsed;
 	float x[ 100 ];
+	double elapsed;
 	double t;
 	float y;
 	int i;
 
 	for ( i = 0; i < 100; i++ ) {
-		x[ i ] = ( 100.0f * rand_float() ) - 50.0f;
+		x[ i ] = random_uniform( -50.0f, 50.0f );
 	}
 
 	t = tic();
 	for ( i = 0; i < ITERATIONS; i++ ) {
-		y = stdlib_base_expf( x[ i % 100 ] );
+		y = stdlib_base_expf( x[ i%100 ] );
 		if ( y != y ) {
 			printf( "should not return NaN\n" );
 			break;