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