Add regression tests for fmin{,f,l} and fmax{,f,l}.

I wrote these to test amd64 asm functions that used
maxss, maxsd, minss, and minsd, but it turns out that
those instructions don't handle NaNs and signed zero
in the same way as fmin() and fmax() are required to,
so we're stuck with the C versions for now.

1 files changed, 149 insertions, 0 deletions

diff --git a/tools/regression/lib/msun/test-fmaxmin.c b/tools/regression/lib/msun/test-fmaxmin.c
new file mode 100644
index 0000000..f1e0a7e
--- /dev/null
+++ b/tools/regression/lib/msun/test-fmaxmin.c
@@ -0,0 +1,149 @@
+/*-
+ * Copyright (c) 2008 David Schultz <das@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Tests for fmax{,f,l}() and fmin{,f,l}.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <fenv.h>
+#include <float.h>
+#include <math.h>
+#include <stdio.h>
+
+#define	ALL_STD_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
+			 FE_OVERFLOW | FE_UNDERFLOW)
+
+#pragma STDC FENV_ACCESS ON
+
+/*
+ * Test for equality with two special rules:
+ *   fpequal(NaN, NaN) is true
+ *   fpequal(+0.0, -0.0) is false
+ */
+inline int
+fpequal(long double x, long double y)
+{
+
+	return ((x == y && signbit(x) == signbit(y)) || (isnan(x) && isnan(y)));
+}
+
+/*
+ * Test whether func(x, y) has the expected result, and make sure no
+ * exceptions are raised.
+ */
+#define	TEST(func, type, x, y, expected) do {				      \
+	type __x = (x);	/* convert before we clear exceptions */	      \
+	type __y = (y);							      \
+	feclearexcept(ALL_STD_EXCEPT);					      \
+	long double __result = func((__x), (__y));			      \
+	if (fetestexcept(ALL_STD_EXCEPT)) {				      \
+		fprintf(stderr, #func "(%L.20g, %L.20g) raised 0x%x\n",	      \
+			(x), (y), fetestexcept(FE_ALL_EXCEPT));		      \
+		ok = 0;							      \
+	}								      \
+	if (!fpequal(__result, (expected)))	{			      \
+		fprintf(stderr, #func "(%.20Lg, %.20Lg) = %.20Lg, "	      \
+			"expected %.20Lg\n", (x), (y), __result, (expected)); \
+		ok = 0;							      \
+	}								      \
+} while (0)
+
+int
+testall_r(long double big, long double small)
+{
+	int ok;
+
+	long double expected_max = isnan(big) ? small : big;
+	long double expected_min = isnan(small) ? big : small;
+	ok = 1;
+
+	TEST(fmaxf, float, big, small, expected_max);
+	TEST(fmaxf, float, small, big, expected_max);
+	TEST(fmax, double, big, small, expected_max);
+	TEST(fmax, double, small, big, expected_max);
+	TEST(fmaxl, long double, big, small, expected_max);
+	TEST(fmaxl, long double, small, big, expected_max);
+	TEST(fminf, float, big, small, expected_min);
+	TEST(fminf, float, small, big, expected_min);
+	TEST(fmin, double, big, small, expected_min);
+	TEST(fmin, double, small, big, expected_min);
+	TEST(fminl, long double, big, small, expected_min);
+	TEST(fminl, long double, small, big, expected_min);
+
+	return (ok);
+}
+
+/*
+ * Test all the functions: fmaxf, fmax, fmaxl, fminf, fmin, and fminl,
+ * in all rounding modes and with the arguments in different orders.
+ * The input 'big' must be >= 'small'.
+ */
+int
+testall(int testnum, long double big, long double small)
+{
+	static const int rmodes[] = {
+		FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
+	};
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		fesetround(rmodes[i]);
+		if (!testall_r(big, small)) {
+			fprintf(stderr, "FAILURE in rounding mode %d\n",
+				rmodes[i]);
+			break;
+		}
+	}
+	printf("%sok %d - big = %.20Lg, small = %.20Lg\n",
+	       (i == 4) ? "" : "not ", testnum, big, small);
+}
+
+int
+main(int argc, char *argv[])
+{
+
+	printf("1..12\n");
+
+	testall(1, 1.0, 0.0);
+	testall(2, 42.0, nextafterf(42.0, -INFINITY));
+	testall(3, nextafterf(42.0, INFINITY), 42.0);
+	testall(4, -5.0, -5.0);
+	testall(5, -3.0, -4.0);
+	testall(6, 1.0, NAN);
+	testall(7, INFINITY, NAN);
+	testall(8, INFINITY, 1.0);
+	testall(9, -3.0, -INFINITY);
+	testall(10, 3.0, -INFINITY);
+	testall(11, NAN, NAN);
+
+	/* This test isn't strictly required to work by C99. */
+	testall(12, 0.0, -0.0);
+
+	return (0);
+}