1 files changed, 185 insertions, 0 deletions
diff --git a/lib/msun/tests/exponential_test.c b/lib/msun/tests/exponential_test.c
new file mode 100644
index 000000000000..9dc3b2698744
--- /dev/null
+++ b/lib/msun/tests/exponential_test.c
@@ -0,0 +1,185 @@
+/*-
+ * 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 corner cases in exp*().
+ */
+
+#include <sys/cdefs.h>
+#include <fenv.h>
+#include <float.h>
+#include <math.h>
+#include <stdio.h>
+
+#ifdef __i386__
+#include <ieeefp.h>
+#endif
+
+#include "test-utils.h"
+
+#pragma STDC FENV_ACCESS ON
+
+/*
+ * Test that a function returns the correct value and sets the
+ * exception flags correctly. The exceptmask specifies which
+ * exceptions we should check. We need to be lenient for several
+ * reasoons, but mainly because on some architectures it's impossible
+ * to raise FE_OVERFLOW without raising FE_INEXACT.
+ *
+ * These are macros instead of functions so that assert provides more
+ * meaningful error messages.
+ *
+ * XXX The volatile here is to avoid gcc's bogus constant folding and work
+ *     around the lack of support for the FENV_ACCESS pragma.
+ */
+#define	test(func, x, result, exceptmask, excepts)	do {		\
+	volatile long double _d = x;					\
+	ATF_REQUIRE_EQ(0, feclearexcept(FE_ALL_EXCEPT));		\
+	CHECK_FPEQUAL((func)(_d), (result));			\
+	CHECK_FP_EXCEPTIONS_MSG(excepts, exceptmask, "for %s(%s)",	\
+	    #func, #x);							\
+} while (0)
+
+/* Test all the functions that compute b^x. */
+#define	_testall0(x, result, exceptmask, excepts)	do {		\
+	test(exp, x, result, exceptmask, excepts);			\
+	test(expf, x, result, exceptmask, excepts);			\
+	test(exp2, x, result, exceptmask, excepts);			\
+	test(exp2f, x, result, exceptmask, excepts);			\
+} while (0)
+
+/* Skip over exp2l on platforms that don't support it. */
+#if LDBL_PREC == 53
+#define	testall0	_testall0
+#else
+#define	testall0(x, result, exceptmask, excepts)	do {		\
+	_testall0(x, result, exceptmask, excepts); 			\
+	test(exp2l, x, result, exceptmask, excepts);			\
+} while (0)
+#endif
+
+/* Test all the functions that compute b^x - 1. */
+#define	testall1(x, result, exceptmask, excepts)	do {		\
+	test(expm1, x, result, exceptmask, excepts);			\
+	test(expm1f, x, result, exceptmask, excepts);			\
+} while (0)
+
+static void
+run_generic_tests(void)
+{
+
+	/* exp(0) == 1, no exceptions raised */
+	testall0(0.0, 1.0, ALL_STD_EXCEPT, 0);
+	testall1(0.0, 0.0, ALL_STD_EXCEPT, 0);
+	testall0(-0.0, 1.0, ALL_STD_EXCEPT, 0);
+	testall1(-0.0, -0.0, ALL_STD_EXCEPT, 0);
+
+	/* exp(NaN) == NaN, no exceptions raised */
+	testall0(NAN, NAN, ALL_STD_EXCEPT, 0);
+	testall1(NAN, NAN, ALL_STD_EXCEPT, 0);
+
+	/* exp(Inf) == Inf, no exceptions raised */
+	testall0(INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
+	testall1(INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
+
+	/* exp(-Inf) == 0, no exceptions raised */
+	testall0(-INFINITY, 0.0, ALL_STD_EXCEPT, 0);
+	testall1(-INFINITY, -1.0, ALL_STD_EXCEPT, 0);
+
+#if !defined(__i386__)
+	/* exp(big) == Inf, overflow exception */
+	testall0(50000.0, INFINITY, ALL_STD_EXCEPT & ~FE_INEXACT, FE_OVERFLOW);
+	testall1(50000.0, INFINITY, ALL_STD_EXCEPT & ~FE_INEXACT, FE_OVERFLOW);
+
+	/* exp(small) == 0, underflow and inexact exceptions */
+	testall0(-50000.0, 0.0, ALL_STD_EXCEPT, FE_UNDERFLOW | FE_INEXACT);
+#endif
+	testall1(-50000.0, -1.0, ALL_STD_EXCEPT, FE_INEXACT);
+}
+
+
+/*
+ * We should insist that exp2() return exactly the correct
+ * result and not raise an inexact exception for integer
+ * arguments.
+ */
+ATF_TC_WITHOUT_HEAD(exp2f);
+ATF_TC_BODY(exp2f, tc)
+{
+	ATF_REQUIRE_EQ(0, feclearexcept(FE_ALL_EXCEPT));
+	for (int i = FLT_MIN_EXP - FLT_MANT_DIG; i < FLT_MAX_EXP; i++) {
+		ATF_CHECK_EQ(exp2f(i), ldexpf(1.0, i));
+		CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT);
+	}
+}
+
+ATF_TC_WITHOUT_HEAD(exp2);
+ATF_TC_BODY(exp2, tc)
+{
+	ATF_REQUIRE_EQ(0, feclearexcept(FE_ALL_EXCEPT));
+	for (int i = DBL_MIN_EXP - DBL_MANT_DIG; i < DBL_MAX_EXP; i++) {
+		ATF_CHECK_EQ(exp2(i), ldexp(1.0, i));
+		CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT);
+	}
+}
+
+ATF_TC_WITHOUT_HEAD(exp2l);
+ATF_TC_BODY(exp2l, tc)
+{
+	ATF_REQUIRE_EQ(0, feclearexcept(FE_ALL_EXCEPT));
+	for (int i = LDBL_MIN_EXP - LDBL_MANT_DIG; i < LDBL_MAX_EXP; i++) {
+		ATF_CHECK_EQ(exp2l(i), ldexpl(1.0, i));
+		CHECK_FP_EXCEPTIONS(0, ALL_STD_EXCEPT);
+	}
+}
+
+ATF_TC_WITHOUT_HEAD(generic);
+ATF_TC_BODY(generic, tc)
+{
+	run_generic_tests();
+}
+
+#ifdef __i386__
+ATF_TC_WITHOUT_HEAD(generic_fp_pe);
+ATF_TC_BODY(generic_fp_pe, tc)
+{
+	fpsetprec(FP_PE);
+	run_generic_tests();
+}
+#endif
+
+ATF_TP_ADD_TCS(tp)
+{
+	ATF_TP_ADD_TC(tp, generic);
+#ifdef __i386__
+	ATF_TP_ADD_TC(tp, generic_fp_pe);
+#endif
+	ATF_TP_ADD_TC(tp, exp2);
+	ATF_TP_ADD_TC(tp, exp2f);
+	ATF_TP_ADD_TC(tp, exp2l);
+
+	return (atf_no_error());
+}