chore: replace fmax with stdlib equivalent

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---

Author: anandkaranubc

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

@@ -40,6 +40,7 @@
         "@stdlib/complex/float64/ctor",
         "@stdlib/complex/float64/reim",
         "@stdlib/math/base/special/abs",
+        "@stdlib/math/base/special/max",
         "@stdlib/constants/float64/max",
         "@stdlib/constants/float64/eps",
         "@stdlib/constants/float64/smallest-normal"
@@ -59,6 +60,7 @@
         "@stdlib/complex/float64/ctor",
         "@stdlib/complex/float64/reim",
         "@stdlib/math/base/special/abs",
+        "@stdlib/math/base/special/max",
         "@stdlib/constants/float64/max",
         "@stdlib/constants/float64/eps",
         "@stdlib/constants/float64/smallest-normal"
@@ -78,6 +80,7 @@
         "@stdlib/complex/float64/ctor",
         "@stdlib/complex/float64/reim",
         "@stdlib/math/base/special/abs",
+        "@stdlib/math/base/special/max",
         "@stdlib/constants/float64/max",
         "@stdlib/constants/float64/eps",
         "@stdlib/constants/float64/smallest-normal"

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

@@ -18,12 +18,12 @@
 
 #include "stdlib/math/base/special/cinv.h"
 #include "stdlib/math/base/special/abs.h"
+#include "stdlib/math/base/special/max.h"
 #include "stdlib/constants/float64/max.h"
 #include "stdlib/constants/float64/eps.h"
 #include "stdlib/constants/float64/smallest_normal.h"
 #include "stdlib/complex/float64/ctor.h"
 #include "stdlib/complex/float64/reim.h"
-#include <math.h>
 
 
 // VARIABLES //
@@ -70,8 +70,7 @@ stdlib_complex128_t stdlib_base_cinv( const stdlib_complex128_t z ) {
 
 	stdlib_complex128_reim( z, &re, &im );
 
-	// TODO: replace `fmax` with stdlib max implementation once available
-	ab = fmax( stdlib_base_abs( re ), stdlib_base_abs( im ) );
+	ab = stdlib_base_max( stdlib_base_abs( re ), stdlib_base_abs( im ) );
 	s = 1.0;
 	if ( ab >= LARGE_THRESHOLD ) {
 		re *= 0.5;

lib/node_modules/@stdlib/math/base/special/cinv/test/test.native.js

@@ -95,14 +95,18 @@ tape( 'the function computes a complex inverse', opts, function test( t ) {
 			t.strictEqual( real( q ), qre[ i ], 'returns expected real component' );
 		} else {
 			delta = abs( real( q ) - qre[ i ] );
-			tol = EPS * abs( qre[ i ] );
+
+			// NOTE: the tolerance here is larger than for the JavaScript implementation due to compiler optimizations which may be performed resulting in result divergence. For discussion, see https://github.com/stdlib-js/stdlib/pull/2298#discussion_r1624765205
+			tol = 1.8 * EPS * abs( qre[ i ] );
 			t.ok( delta <= tol, 'within tolerance. x: '+re[i]+'+ '+im[i]+'i. real: '+real( q )+'. expected: '+qre[i]+'. delta: '+delta+'. tol: '+tol+'.' );
 		}
 		if ( imag( q ) === qim[ i ] ) {
 			t.strictEqual( imag( q ), qim[ i ], 'returns expected imaginary component' );
 		} else {
 			delta = abs( imag( q ) - qim[ i ] );
-			tol = EPS * abs( qim[ i ] );
+
+			// NOTE: the tolerance here is larger than for the JavaScript implementation due to compiler optimizations which may be performed resulting in result divergence. For discussion, see https://github.com/stdlib-js/stdlib/pull/2298#discussion_r1624765205
+			tol = 1.7 * EPS * abs( qim[ i ] );
 			t.ok( delta <= tol, 'within tolerance. x: '+re[i]+'+ '+im[i]+'i. imag: '+imag( q )+'. expected: '+qim[i]+'. delta: '+delta+'. tol: '+tol+'.' );
 		}
 	}