// SPDX-License-Identifier: GPL-2.0+ #include <linux/errno.h> #include "test_fpu.h" int test_fpu(void){	/*	 * This sequence of operations tests that rounding mode is	 * to nearest and that denormal numbers are supported.	 * Volatile variables are used to avoid compiler optimizing	 * the calculations away.	 */	volatile double a, b, c, d, e, f, g; 	a = 4.0;	b = 1e-15;	c = 1e-310; 	/* Sets precision flag */	d = a + b; 	/* Result depends on rounding mode */	e = a + b / 2; 	/* Denormal and very large values */	f = b / c; 	/* Depends on denormal support */	g = a + c * f; 	if (d > a && e > a && g > a)		return 0;	else		return -EINVAL;}