Add some tests for fma(), fmaf(), and fmal().

3 files changed, 424 insertions, 1 deletions

diff --git a/tools/regression/lib/msun/Makefile b/tools/regression/lib/msun/Makefile
index 99c86f2..558d46f 100644
--- a/tools/regression/lib/msun/Makefile
+++ b/tools/regression/lib/msun/Makefile
@@ -1,6 +1,6 @@
 # $FreeBSD$
 
-TESTS=	test-csqrt test-exponential test-fenv test-ilogb test-lrint \
+TESTS=	test-csqrt test-exponential test-fenv test-fma test-ilogb test-lrint \
 	test-lround test-nan test-next test-rem test-trig
 CFLAGS+= -O0 -lm
 
diff --git a/tools/regression/lib/msun/test-fma.c b/tools/regression/lib/msun/test-fma.c
new file mode 100644
index 0000000..5511eb3
--- /dev/null
+++ b/tools/regression/lib/msun/test-fma.c
@@ -0,0 +1,413 @@
+/*-
+ * 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 fma{,f,l}().
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <assert.h>
+#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 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
+ * reasons, 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.
+ */
+#define	test(func, x, y, z, result, exceptmask, excepts) do {		\
+	assert(feclearexcept(FE_ALL_EXCEPT) == 0);			\
+	assert(fpequal((func)((x), (y), (z)), (result)));		\
+	assert(((func), fetestexcept(exceptmask) == (excepts)));	\
+} while (0)
+
+#define	testall(x, y, z, result, exceptmask, excepts)	do {		\
+	test(fma, (x), (y), (z), (double)(result), (exceptmask), (excepts)); \
+	test(fmaf, (x), (y), (z), (float)(result), (exceptmask), (excepts)); \
+	test(fmal, (x), (y), (z), (result), (exceptmask), (excepts));	\
+} while (0)
+
+/* Test in all rounding modes. */
+#define	testrnd(func, x, y, z, rn, ru, rd, rz, exceptmask, excepts)	do { \
+	fesetround(FE_TONEAREST);					\
+	test((func), (x), (y), (z), (rn), (exceptmask), (excepts));	\
+	fesetround(FE_UPWARD);						\
+	test((func), (x), (y), (z), (ru), (exceptmask), (excepts));	\
+	fesetround(FE_DOWNWARD);					\
+	test((func), (x), (y), (z), (rd), (exceptmask), (excepts));	\
+	fesetround(FE_TOWARDZERO);					\
+	test((func), (x), (y), (z), (rz), (exceptmask), (excepts));	\
+} while (0)
+
+/*
+ * Determine whether x and y are equal, with two special rules:
+ *	+0.0 != -0.0
+ *	 NaN == NaN
+ */
+int
+fpequal(long double x, long double y)
+{
+
+	return ((x == y && signbit(x) == signbit(y)) || (isnan(x) && isnan(y)));
+}
+
+static void
+test_zeroes(void)
+{
+	const int rd = (fegetround() == FE_DOWNWARD);
+
+	testall(0.0, 0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
+	testall(1.0, 0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
+	testall(0.0, 1.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
+	testall(0.0, 0.0, 1.0, 1.0, ALL_STD_EXCEPT, 0);
+
+	testall(-0.0, 0.0, 0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
+	testall(0.0, -0.0, 0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
+	testall(-0.0, -0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
+	testall(0.0, 0.0, -0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
+	testall(-0.0, -0.0, -0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
+
+	testall(-0.0, 0.0, -0.0, -0.0, ALL_STD_EXCEPT, 0);
+	testall(0.0, -0.0, -0.0, -0.0, ALL_STD_EXCEPT, 0);
+
+	testall(-1.0, 1.0, 1.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
+	testall(1.0, -1.0, 1.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
+	testall(-1.0, -1.0, -1.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
+
+	switch (fegetround()) {
+	case FE_TONEAREST:
+	case FE_TOWARDZERO:
+		test(fmaf, -FLT_MIN, FLT_MIN, 0.0, -0.0,
+		     ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
+		test(fma, -DBL_MIN, DBL_MIN, 0.0, -0.0,
+		     ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
+		test(fmal, -LDBL_MIN, LDBL_MIN, 0.0, -0.0,
+		     ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
+	}
+}
+
+static void
+test_infinities(void)
+{
+
+	testall(INFINITY, 1.0, -1.0, INFINITY, ALL_STD_EXCEPT, 0);
+	testall(-1.0, INFINITY, 0.0, -INFINITY, ALL_STD_EXCEPT, 0);
+	testall(0.0, 0.0, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
+	testall(1.0, 1.0, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
+	testall(1.0, 1.0, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
+
+	testall(INFINITY, -INFINITY, 1.0, -INFINITY, ALL_STD_EXCEPT, 0);
+	testall(INFINITY, INFINITY, 1.0, INFINITY, ALL_STD_EXCEPT, 0);
+	testall(-INFINITY, -INFINITY, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
+
+	testall(0.0, INFINITY, 1.0, NAN, ALL_STD_EXCEPT, FE_INVALID);
+	testall(INFINITY, 0.0, -0.0, NAN, ALL_STD_EXCEPT, FE_INVALID);
+
+	/* The invalid exception is optional in this case. */
+	testall(INFINITY, 0.0, NAN, NAN, ALL_STD_EXCEPT & ~FE_INVALID, 0);
+
+	testall(INFINITY, INFINITY, -INFINITY, NAN,
+		ALL_STD_EXCEPT, FE_INVALID);
+	testall(-INFINITY, INFINITY, INFINITY, NAN,
+		ALL_STD_EXCEPT, FE_INVALID);
+	testall(INFINITY, -1.0, INFINITY, NAN,
+		ALL_STD_EXCEPT, FE_INVALID);
+
+	test(fmaf, FLT_MAX, FLT_MAX, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
+	test(fma, DBL_MAX, DBL_MAX, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
+	test(fmal, LDBL_MAX, LDBL_MAX, -INFINITY, -INFINITY,
+	     ALL_STD_EXCEPT, 0);
+	test(fmaf, FLT_MAX, -FLT_MAX, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
+	test(fma, DBL_MAX, -DBL_MAX, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
+	test(fmal, LDBL_MAX, -LDBL_MAX, INFINITY, INFINITY,
+	     ALL_STD_EXCEPT, 0);
+}
+
+static void
+test_nans(void)
+{
+
+	testall(NAN, 0.0, 0.0, NAN, ALL_STD_EXCEPT, 0);
+	testall(1.0, NAN, 1.0, NAN, ALL_STD_EXCEPT, 0);
+	testall(1.0, -1.0, NAN, NAN, ALL_STD_EXCEPT, 0);
+	testall(0.0, 0.0, NAN, NAN, ALL_STD_EXCEPT, 0);
+	testall(NAN, NAN, NAN, NAN, ALL_STD_EXCEPT, 0);
+
+	/* x*y should not raise an inexact/overflow/underflow if z is NaN. */
+	testall(M_PI, M_PI, NAN, NAN, ALL_STD_EXCEPT, 0);
+	test(fmaf, FLT_MIN, FLT_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
+	test(fma, DBL_MIN, DBL_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
+	test(fmal, LDBL_MIN, LDBL_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
+	test(fmaf, FLT_MAX, FLT_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
+	test(fma, DBL_MAX, DBL_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
+	test(fmal, LDBL_MAX, LDBL_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
+}
+
+/*
+ * Tests for cases where z is very small compared to x*y.
+ */
+static void
+test_small_z(void)
+{
+
+	/* x*y positive, z positive */
+	if (fegetround() == FE_UPWARD) {
+		test(fmaf, 1.0, 1.0, 0x1.0p-100, 1.0 + FLT_EPSILON,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, 1.0, 1.0, 0x1.0p-200, 1.0 + DBL_EPSILON,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, 1.0, 1.0, 0x1.0p-200, 1.0 + LDBL_EPSILON,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(0x1.0p100, 1.0, 0x1.0p-100, 0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+
+	/* x*y negative, z negative */
+	if (fegetround() == FE_DOWNWARD) {
+		test(fmaf, -1.0, 1.0, -0x1.0p-100, -(1.0 + FLT_EPSILON),
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, -1.0, 1.0, -0x1.0p-200, -(1.0 + DBL_EPSILON),
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, -1.0, 1.0, -0x1.0p-200, -(1.0 + LDBL_EPSILON),
+		     ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(0x1.0p100, -1.0, -0x1.0p-100, -0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+
+	/* x*y positive, z negative */
+	if (fegetround() == FE_DOWNWARD || fegetround() == FE_TOWARDZERO) {
+		test(fmaf, 1.0, 1.0, -0x1.0p-100, 1.0 - FLT_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, 1.0, 1.0, -0x1.0p-200, 1.0 - DBL_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, 1.0, 1.0, -0x1.0p-200, 1.0 - LDBL_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(0x1.0p100, 1.0, -0x1.0p-100, 0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+
+	/* x*y negative, z positive */
+	if (fegetround() == FE_UPWARD || fegetround() == FE_TOWARDZERO) {
+		test(fmaf, -1.0, 1.0, 0x1.0p-100, -1.0 + FLT_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, -1.0, 1.0, 0x1.0p-200, -1.0 + DBL_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, -1.0, 1.0, 0x1.0p-200, -1.0 + LDBL_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(-0x1.0p100, 1.0, 0x1.0p-100, -0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+}
+
+/*
+ * Tests for cases where z is very large compared to x*y.
+ */
+static void
+test_big_z(void)
+{
+
+	/* z positive, x*y positive */
+	if (fegetround() == FE_UPWARD) {
+		test(fmaf, 0x1.0p-50, 0x1.0p-50, 1.0, 1.0 + FLT_EPSILON,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, 0x1.0p-100, 0x1.0p-100, 1.0, 1.0 + DBL_EPSILON,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, 0x1.0p-100, 0x1.0p-100, 1.0, 1.0 + LDBL_EPSILON,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(-0x1.0p-50, -0x1.0p-50, 0x1.0p100, 0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+
+	/* z negative, x*y negative */
+	if (fegetround() == FE_DOWNWARD) {
+		test(fmaf, -0x1.0p-50, 0x1.0p-50, -1.0, -(1.0 + FLT_EPSILON),
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, -0x1.0p-100, 0x1.0p-100, -1.0, -(1.0 + DBL_EPSILON),
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, -0x1.0p-100, 0x1.0p-100, -1.0, -(1.0 + LDBL_EPSILON),
+		     ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(0x1.0p-50, -0x1.0p-50, -0x1.0p100, -0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+
+	/* z negative, x*y positive */
+	if (fegetround() == FE_UPWARD || fegetround() == FE_TOWARDZERO) {
+		test(fmaf, -0x1.0p-50, -0x1.0p-50, -1.0,
+		     -1.0 + FLT_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, -0x1.0p-100, -0x1.0p-100, -1.0,
+		     -1.0 + DBL_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, -0x1.0p-100, -0x1.0p-100, -1.0,
+		     -1.0 + LDBL_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(0x1.0p-50, 0x1.0p-50, -0x1.0p100, -0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+
+	/* z positive, x*y negative */
+	if (fegetround() == FE_DOWNWARD || fegetround() == FE_TOWARDZERO) {
+		test(fmaf, 0x1.0p-50, -0x1.0p-50, 1.0, 1.0 - FLT_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fma, 0x1.0p-100, -0x1.0p-100, 1.0, 1.0 - DBL_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+		test(fmal, 0x1.0p-100, -0x1.0p-100, 1.0, 1.0 - LDBL_EPSILON / 2,
+		     ALL_STD_EXCEPT, FE_INEXACT);
+	} else {
+		testall(-0x1.0p-50, 0x1.0p-50, 0x1.0p100, 0x1.0p100,
+			ALL_STD_EXCEPT, FE_INEXACT);
+	}
+}
+
+static void
+test_accuracy(void)
+{
+
+	/* ilogb(x*y) - ilogb(z) = 20 */
+	testrnd(fmaf, -0x1.c139d8p-51, -0x1.600e7ap32, 0x1.26558cp-38,
+		0x1.34e48ap-18, 0x1.34e48cp-18, 0x1.34e48ap-18, 0x1.34e48ap-18,
+		ALL_STD_EXCEPT, FE_INEXACT);
+	testrnd(fma, -0x1.c139d7b84f1a3p-51, -0x1.600e7a2a16484p32,
+		0x1.26558cac31580p-38, 0x1.34e48a78aae97p-18,
+		0x1.34e48a78aae97p-18, 0x1.34e48a78aae96p-18,
+		0x1.34e48a78aae96p-18, ALL_STD_EXCEPT, FE_INEXACT);
+#if LDBL_MANT_DIG == 113
+	testrnd(fmal, -0x1.c139d7b84f1a3079263afcc5bae3p-51L,
+		-0x1.600e7a2a164840edbe2e7d301a72p32L,
+		0x1.26558cac315807eb07e448042101p-38L,
+		0x1.34e48a78aae96c76ed36077dd387p-18L,
+		0x1.34e48a78aae96c76ed36077dd388p-18L,
+		0x1.34e48a78aae96c76ed36077dd387p-18L,
+		0x1.34e48a78aae96c76ed36077dd387p-18L,
+		ALL_STD_EXCEPT, FE_INEXACT);
+#elif LDBL_MANT_DIG == 64
+	testrnd(fmal, -0x1.c139d7b84f1a307ap-51L, -0x1.600e7a2a164840eep32L,
+		0x1.26558cac315807ecp-38L, 0x1.34e48a78aae96c78p-18L,
+		0x1.34e48a78aae96c78p-18L, 0x1.34e48a78aae96c76p-18L,
+		0x1.34e48a78aae96c76p-18L, ALL_STD_EXCEPT, FE_INEXACT);
+#elif LDBL_MANT_DIG == 53
+	testrnd(fmal, -0x1.c139d7b84f1a3p-51L, -0x1.600e7a2a16484p32L,
+		0x1.26558cac31580p-38L, 0x1.34e48a78aae97p-18L,
+		0x1.34e48a78aae97p-18L, 0x1.34e48a78aae96p-18L,
+		0x1.34e48a78aae96p-18L, ALL_STD_EXCEPT, FE_INEXACT);
+#endif
+
+	/* ilogb(x*y) - ilogb(z) = -40 */
+	testrnd(fmaf, 0x1.98210ap53, 0x1.9556acp-24, 0x1.d87da4p70,
+		0x1.d87da4p70, 0x1.d87da6p70, 0x1.d87da4p70, 0x1.d87da4p70,
+		ALL_STD_EXCEPT, FE_INEXACT);
+	testrnd(fma, 0x1.98210ac83fe2bp53, 0x1.9556ac1475f0fp-24,
+		0x1.d87da3aafc60ep70, 0x1.d87da3aafda40p70,
+		0x1.d87da3aafda40p70, 0x1.d87da3aafda3fp70,
+		0x1.d87da3aafda3fp70, ALL_STD_EXCEPT, FE_INEXACT);
+#if LDBL_MANT_DIG == 113
+	testrnd(fmal, 0x1.98210ac83fe2a8f65b6278b74cebp53L,
+		0x1.9556ac1475f0f28968b61d0de65ap-24L,
+		0x1.d87da3aafc60d830aa4c6d73b749p70L,
+		0x1.d87da3aafda3f36a69eb86488224p70L,
+		0x1.d87da3aafda3f36a69eb86488225p70L,
+		0x1.d87da3aafda3f36a69eb86488224p70L,
+		0x1.d87da3aafda3f36a69eb86488224p70L,
+		ALL_STD_EXCEPT, FE_INEXACT);
+#elif LDBL_MANT_DIG == 64
+	testrnd(fmal, 0x1.98210ac83fe2a8f6p53L, 0x1.9556ac1475f0f28ap-24L,
+		0x1.d87da3aafc60d83p70L, 0x1.d87da3aafda3f36ap70L,
+		0x1.d87da3aafda3f36ap70L, 0x1.d87da3aafda3f368p70L,
+		0x1.d87da3aafda3f368p70L, ALL_STD_EXCEPT, FE_INEXACT);
+#elif LDBL_MANT_DIG == 53
+	testrnd(fmal, 0x1.98210ac83fe2bp53L, 0x1.9556ac1475f0fp-24L,
+		0x1.d87da3aafc60ep70L, 0x1.d87da3aafda40p70L,
+		0x1.d87da3aafda40p70L, 0x1.d87da3aafda3fp70L,
+		0x1.d87da3aafda3fp70L, ALL_STD_EXCEPT, FE_INEXACT);
+#endif
+}
+
+int
+main(int argc, char *argv[])
+{
+	int rmodes[] = { FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO };
+	int i;
+
+	printf("1..18\n");
+
+	for (i = 0; i < 4; i++) {
+		fesetround(rmodes[i]);
+		test_zeroes();
+		printf("ok %d - fma zeroes\n", i + 1);
+	}
+
+	for (i = 0; i < 4; i++) {
+		fesetround(rmodes[i]);
+		test_infinities();
+		printf("ok %d - fma infinities\n", i + 5);
+	}
+
+	fesetround(FE_TONEAREST);
+	test_nans();
+	printf("ok 9 - fma NaNs\n");
+
+	for (i = 0; i < 4; i++) {
+		fesetround(rmodes[i]);
+		test_small_z();
+		printf("ok %d - fma small z\n", i + 10);
+	}
+
+	for (i = 0; i < 4; i++) {
+		fesetround(rmodes[i]);
+		test_big_z();
+		printf("ok %d - fma big z\n", i + 14);
+	}
+
+	fesetround(FE_TONEAREST);
+	test_accuracy();
+	printf("ok 18 - fma accuracy\n");
+
+	/*
+	 * TODO:
+	 * - Tests for subnormals
+	 * - Cancellation tests (e.g., z = (double)x*y, but x*y is inexact)
+	 */
+
+	return (0);
+}
diff --git a/tools/regression/lib/msun/test-fma.t b/tools/regression/lib/msun/test-fma.t
new file mode 100644
index 0000000..8bdfd03
--- /dev/null
+++ b/tools/regression/lib/msun/test-fma.t
@@ -0,0 +1,10 @@
+#!/bin/sh
+# $FreeBSD$
+
+cd `dirname $0`
+
+executable=`basename $0 .t`
+
+make $executable 2>&1 > /dev/null
+
+exec ./$executable