2 * Copyright (c) 2008 David Schultz <das@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * Tests for fma{,f,l}().
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
41 #include "test-utils.h"
43 #pragma STDC FENV_ACCESS ON
46 * Test that a function returns the correct value and sets the
47 * exception flags correctly. The exceptmask specifies which
48 * exceptions we should check. We need to be lenient for several
49 * reasons, but mainly because on some architectures it's impossible
50 * to raise FE_OVERFLOW without raising FE_INEXACT.
52 * These are macros instead of functions so that assert provides more
53 * meaningful error messages.
55 #define test(func, x, y, z, result, exceptmask, excepts) do { \
56 volatile long double _vx = (x), _vy = (y), _vz = (z); \
57 ATF_CHECK(feclearexcept(FE_ALL_EXCEPT) == 0); \
58 CHECK_FPEQUAL((func)(_vx, _vy, _vz), (result)); \
59 CHECK_FP_EXCEPTIONS_MSG(excepts, exceptmask, "for %s(%s)", \
63 #define testall(x, y, z, result, exceptmask, excepts) do { \
64 test(fma, (double)(x), (double)(y), (double)(z), \
65 (double)(result), (exceptmask), (excepts)); \
66 test(fmaf, (float)(x), (float)(y), (float)(z), \
67 (float)(result), (exceptmask), (excepts)); \
68 test(fmal, (x), (y), (z), (result), (exceptmask), (excepts)); \
71 /* Test in all rounding modes. */
72 #define testrnd(func, x, y, z, rn, ru, rd, rz, exceptmask, excepts) do { \
73 fesetround(FE_TONEAREST); \
74 test((func), (x), (y), (z), (rn), (exceptmask), (excepts)); \
75 fesetround(FE_UPWARD); \
76 test((func), (x), (y), (z), (ru), (exceptmask), (excepts)); \
77 fesetround(FE_DOWNWARD); \
78 test((func), (x), (y), (z), (rd), (exceptmask), (excepts)); \
79 fesetround(FE_TOWARDZERO); \
80 test((func), (x), (y), (z), (rz), (exceptmask), (excepts)); \
84 * This is needed because clang constant-folds fma in ways that are incorrect
85 * in rounding modes other than FE_TONEAREST.
87 static volatile double one = 1.0;
92 const int rd = (fegetround() == FE_DOWNWARD);
94 testall(0.0, 0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
95 testall(1.0, 0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
96 testall(0.0, 1.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
97 testall(0.0, 0.0, 1.0, 1.0, ALL_STD_EXCEPT, 0);
99 testall(-0.0, 0.0, 0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
100 testall(0.0, -0.0, 0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
101 testall(-0.0, -0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
102 testall(0.0, 0.0, -0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
103 testall(-0.0, -0.0, -0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
105 testall(-0.0, 0.0, -0.0, -0.0, ALL_STD_EXCEPT, 0);
106 testall(0.0, -0.0, -0.0, -0.0, ALL_STD_EXCEPT, 0);
108 testall(-one, one, one, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
109 testall(one, -one, one, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
110 testall(-one, -one, -one, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
112 switch (fegetround()) {
115 test(fmaf, -FLT_MIN, FLT_MIN, 0.0, -0.0,
116 ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
117 test(fma, -DBL_MIN, DBL_MIN, 0.0, -0.0,
118 ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
119 test(fmal, -LDBL_MIN, LDBL_MIN, 0.0, -0.0,
120 ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
125 test_infinities(void)
127 testall(INFINITY, 1.0, -1.0, INFINITY, ALL_STD_EXCEPT, 0);
128 testall(-1.0, INFINITY, 0.0, -INFINITY, ALL_STD_EXCEPT, 0);
129 testall(0.0, 0.0, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
130 testall(1.0, 1.0, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
131 testall(1.0, 1.0, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
133 testall(INFINITY, -INFINITY, 1.0, -INFINITY, ALL_STD_EXCEPT, 0);
134 testall(INFINITY, INFINITY, 1.0, INFINITY, ALL_STD_EXCEPT, 0);
135 testall(-INFINITY, -INFINITY, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
137 testall(0.0, INFINITY, 1.0, NAN, ALL_STD_EXCEPT, FE_INVALID);
138 testall(INFINITY, 0.0, -0.0, NAN, ALL_STD_EXCEPT, FE_INVALID);
140 /* The invalid exception is optional in this case. */
141 testall(INFINITY, 0.0, NAN, NAN, ALL_STD_EXCEPT & ~FE_INVALID, 0);
143 testall(INFINITY, INFINITY, -INFINITY, NAN,
144 ALL_STD_EXCEPT, FE_INVALID);
145 testall(-INFINITY, INFINITY, INFINITY, NAN,
146 ALL_STD_EXCEPT, FE_INVALID);
147 testall(INFINITY, -1.0, INFINITY, NAN,
148 ALL_STD_EXCEPT, FE_INVALID);
150 test(fmaf, FLT_MAX, FLT_MAX, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
151 test(fma, DBL_MAX, DBL_MAX, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
152 test(fmal, LDBL_MAX, LDBL_MAX, -INFINITY, -INFINITY,
154 test(fmaf, FLT_MAX, -FLT_MAX, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
155 test(fma, DBL_MAX, -DBL_MAX, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
156 test(fmal, LDBL_MAX, -LDBL_MAX, INFINITY, INFINITY,
163 testall(NAN, 0.0, 0.0, NAN, ALL_STD_EXCEPT, 0);
164 testall(1.0, NAN, 1.0, NAN, ALL_STD_EXCEPT, 0);
165 testall(1.0, -1.0, NAN, NAN, ALL_STD_EXCEPT, 0);
166 testall(0.0, 0.0, NAN, NAN, ALL_STD_EXCEPT, 0);
167 testall(NAN, NAN, NAN, NAN, ALL_STD_EXCEPT, 0);
169 /* x*y should not raise an inexact/overflow/underflow if z is NaN. */
170 testall(M_PI, M_PI, NAN, NAN, ALL_STD_EXCEPT, 0);
171 test(fmaf, FLT_MIN, FLT_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
172 test(fma, DBL_MIN, DBL_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
173 test(fmal, LDBL_MIN, LDBL_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
174 test(fmaf, FLT_MAX, FLT_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
175 test(fma, DBL_MAX, DBL_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
176 test(fmal, LDBL_MAX, LDBL_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
180 * Tests for cases where z is very small compared to x*y.
185 /* x*y positive, z positive */
186 if (fegetround() == FE_UPWARD) {
187 test(fmaf, one, one, 0x1.0p-100, 1.0 + FLT_EPSILON,
188 ALL_STD_EXCEPT, FE_INEXACT);
189 test(fma, one, one, 0x1.0p-200, 1.0 + DBL_EPSILON,
190 ALL_STD_EXCEPT, FE_INEXACT);
191 test(fmal, one, one, 0x1.0p-200, 1.0 + LDBL_EPSILON,
192 ALL_STD_EXCEPT, FE_INEXACT);
194 testall(0x1.0p100, one, 0x1.0p-100, 0x1.0p100,
195 ALL_STD_EXCEPT, FE_INEXACT);
198 /* x*y negative, z negative */
199 if (fegetround() == FE_DOWNWARD) {
200 test(fmaf, -one, one, -0x1.0p-100, -(1.0 + FLT_EPSILON),
201 ALL_STD_EXCEPT, FE_INEXACT);
202 test(fma, -one, one, -0x1.0p-200, -(1.0 + DBL_EPSILON),
203 ALL_STD_EXCEPT, FE_INEXACT);
204 test(fmal, -one, one, -0x1.0p-200, -(1.0 + LDBL_EPSILON),
205 ALL_STD_EXCEPT, FE_INEXACT);
207 testall(0x1.0p100, -one, -0x1.0p-100, -0x1.0p100,
208 ALL_STD_EXCEPT, FE_INEXACT);
211 /* x*y positive, z negative */
212 if (fegetround() == FE_DOWNWARD || fegetround() == FE_TOWARDZERO) {
213 test(fmaf, one, one, -0x1.0p-100, 1.0 - FLT_EPSILON / 2,
214 ALL_STD_EXCEPT, FE_INEXACT);
215 test(fma, one, one, -0x1.0p-200, 1.0 - DBL_EPSILON / 2,
216 ALL_STD_EXCEPT, FE_INEXACT);
217 test(fmal, one, one, -0x1.0p-200, 1.0 - LDBL_EPSILON / 2,
218 ALL_STD_EXCEPT, FE_INEXACT);
220 testall(0x1.0p100, one, -0x1.0p-100, 0x1.0p100,
221 ALL_STD_EXCEPT, FE_INEXACT);
224 /* x*y negative, z positive */
225 if (fegetround() == FE_UPWARD || fegetround() == FE_TOWARDZERO) {
226 test(fmaf, -one, one, 0x1.0p-100, -1.0 + FLT_EPSILON / 2,
227 ALL_STD_EXCEPT, FE_INEXACT);
228 test(fma, -one, one, 0x1.0p-200, -1.0 + DBL_EPSILON / 2,
229 ALL_STD_EXCEPT, FE_INEXACT);
230 test(fmal, -one, one, 0x1.0p-200, -1.0 + LDBL_EPSILON / 2,
231 ALL_STD_EXCEPT, FE_INEXACT);
233 testall(-0x1.0p100, one, 0x1.0p-100, -0x1.0p100,
234 ALL_STD_EXCEPT, FE_INEXACT);
239 * Tests for cases where z is very large compared to x*y.
244 /* z positive, x*y positive */
245 if (fegetround() == FE_UPWARD) {
246 test(fmaf, 0x1.0p-50, 0x1.0p-50, 1.0, 1.0 + FLT_EPSILON,
247 ALL_STD_EXCEPT, FE_INEXACT);
248 test(fma, 0x1.0p-100, 0x1.0p-100, 1.0, 1.0 + DBL_EPSILON,
249 ALL_STD_EXCEPT, FE_INEXACT);
250 test(fmal, 0x1.0p-100, 0x1.0p-100, 1.0, 1.0 + LDBL_EPSILON,
251 ALL_STD_EXCEPT, FE_INEXACT);
253 testall(-0x1.0p-50, -0x1.0p-50, 0x1.0p100, 0x1.0p100,
254 ALL_STD_EXCEPT, FE_INEXACT);
257 /* z negative, x*y negative */
258 if (fegetround() == FE_DOWNWARD) {
259 test(fmaf, -0x1.0p-50, 0x1.0p-50, -1.0, -(1.0 + FLT_EPSILON),
260 ALL_STD_EXCEPT, FE_INEXACT);
261 test(fma, -0x1.0p-100, 0x1.0p-100, -1.0, -(1.0 + DBL_EPSILON),
262 ALL_STD_EXCEPT, FE_INEXACT);
263 test(fmal, -0x1.0p-100, 0x1.0p-100, -1.0, -(1.0 + LDBL_EPSILON),
264 ALL_STD_EXCEPT, FE_INEXACT);
266 testall(0x1.0p-50, -0x1.0p-50, -0x1.0p100, -0x1.0p100,
267 ALL_STD_EXCEPT, FE_INEXACT);
270 /* z negative, x*y positive */
271 if (fegetround() == FE_UPWARD || fegetround() == FE_TOWARDZERO) {
272 test(fmaf, -0x1.0p-50, -0x1.0p-50, -1.0,
273 -1.0 + FLT_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
274 test(fma, -0x1.0p-100, -0x1.0p-100, -1.0,
275 -1.0 + DBL_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
276 test(fmal, -0x1.0p-100, -0x1.0p-100, -1.0,
277 -1.0 + LDBL_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
279 testall(0x1.0p-50, 0x1.0p-50, -0x1.0p100, -0x1.0p100,
280 ALL_STD_EXCEPT, FE_INEXACT);
283 /* z positive, x*y negative */
284 if (fegetround() == FE_DOWNWARD || fegetround() == FE_TOWARDZERO) {
285 test(fmaf, 0x1.0p-50, -0x1.0p-50, 1.0, 1.0 - FLT_EPSILON / 2,
286 ALL_STD_EXCEPT, FE_INEXACT);
287 test(fma, 0x1.0p-100, -0x1.0p-100, 1.0, 1.0 - DBL_EPSILON / 2,
288 ALL_STD_EXCEPT, FE_INEXACT);
289 test(fmal, 0x1.0p-100, -0x1.0p-100, 1.0, 1.0 - LDBL_EPSILON / 2,
290 ALL_STD_EXCEPT, FE_INEXACT);
292 testall(-0x1.0p-50, 0x1.0p-50, 0x1.0p100, 0x1.0p100,
293 ALL_STD_EXCEPT, FE_INEXACT);
301 /* ilogb(x*y) - ilogb(z) = 20 */
302 testrnd(fmaf, -0x1.c139d8p-51, -0x1.600e7ap32, 0x1.26558cp-38,
303 0x1.34e48ap-18, 0x1.34e48cp-18, 0x1.34e48ap-18, 0x1.34e48ap-18,
304 ALL_STD_EXCEPT, FE_INEXACT);
305 testrnd(fma, -0x1.c139d7b84f1a3p-51, -0x1.600e7a2a16484p32,
306 0x1.26558cac31580p-38, 0x1.34e48a78aae97p-18,
307 0x1.34e48a78aae97p-18, 0x1.34e48a78aae96p-18,
308 0x1.34e48a78aae96p-18, ALL_STD_EXCEPT, FE_INEXACT);
309 #if LDBL_MANT_DIG == 113
310 testrnd(fmal, -0x1.c139d7b84f1a3079263afcc5bae3p-51L,
311 -0x1.600e7a2a164840edbe2e7d301a72p32L,
312 0x1.26558cac315807eb07e448042101p-38L,
313 0x1.34e48a78aae96c76ed36077dd387p-18L,
314 0x1.34e48a78aae96c76ed36077dd388p-18L,
315 0x1.34e48a78aae96c76ed36077dd387p-18L,
316 0x1.34e48a78aae96c76ed36077dd387p-18L,
317 ALL_STD_EXCEPT, FE_INEXACT);
318 #elif LDBL_MANT_DIG == 64
319 testrnd(fmal, -0x1.c139d7b84f1a307ap-51L, -0x1.600e7a2a164840eep32L,
320 0x1.26558cac315807ecp-38L, 0x1.34e48a78aae96c78p-18L,
321 0x1.34e48a78aae96c78p-18L, 0x1.34e48a78aae96c76p-18L,
322 0x1.34e48a78aae96c76p-18L, ALL_STD_EXCEPT, FE_INEXACT);
323 #elif LDBL_MANT_DIG == 53
324 testrnd(fmal, -0x1.c139d7b84f1a3p-51L, -0x1.600e7a2a16484p32L,
325 0x1.26558cac31580p-38L, 0x1.34e48a78aae97p-18L,
326 0x1.34e48a78aae97p-18L, 0x1.34e48a78aae96p-18L,
327 0x1.34e48a78aae96p-18L, ALL_STD_EXCEPT, FE_INEXACT);
330 /* ilogb(x*y) - ilogb(z) = -40 */
331 testrnd(fmaf, 0x1.98210ap53, 0x1.9556acp-24, 0x1.d87da4p70,
332 0x1.d87da4p70, 0x1.d87da6p70, 0x1.d87da4p70, 0x1.d87da4p70,
333 ALL_STD_EXCEPT, FE_INEXACT);
334 testrnd(fma, 0x1.98210ac83fe2bp53, 0x1.9556ac1475f0fp-24,
335 0x1.d87da3aafc60ep70, 0x1.d87da3aafda40p70,
336 0x1.d87da3aafda40p70, 0x1.d87da3aafda3fp70,
337 0x1.d87da3aafda3fp70, ALL_STD_EXCEPT, FE_INEXACT);
338 #if LDBL_MANT_DIG == 113
339 testrnd(fmal, 0x1.98210ac83fe2a8f65b6278b74cebp53L,
340 0x1.9556ac1475f0f28968b61d0de65ap-24L,
341 0x1.d87da3aafc60d830aa4c6d73b749p70L,
342 0x1.d87da3aafda3f36a69eb86488224p70L,
343 0x1.d87da3aafda3f36a69eb86488225p70L,
344 0x1.d87da3aafda3f36a69eb86488224p70L,
345 0x1.d87da3aafda3f36a69eb86488224p70L,
346 ALL_STD_EXCEPT, FE_INEXACT);
347 #elif LDBL_MANT_DIG == 64
348 testrnd(fmal, 0x1.98210ac83fe2a8f6p53L, 0x1.9556ac1475f0f28ap-24L,
349 0x1.d87da3aafc60d83p70L, 0x1.d87da3aafda3f36ap70L,
350 0x1.d87da3aafda3f36ap70L, 0x1.d87da3aafda3f368p70L,
351 0x1.d87da3aafda3f368p70L, ALL_STD_EXCEPT, FE_INEXACT);
352 #elif LDBL_MANT_DIG == 53
353 testrnd(fmal, 0x1.98210ac83fe2bp53L, 0x1.9556ac1475f0fp-24L,
354 0x1.d87da3aafc60ep70L, 0x1.d87da3aafda40p70L,
355 0x1.d87da3aafda40p70L, 0x1.d87da3aafda3fp70L,
356 0x1.d87da3aafda3fp70L, ALL_STD_EXCEPT, FE_INEXACT);
359 /* ilogb(x*y) - ilogb(z) = 0 */
360 testrnd(fmaf, 0x1.31ad02p+100, 0x1.2fbf7ap-42, -0x1.c3e106p+58,
361 -0x1.64c27cp+56, -0x1.64c27ap+56, -0x1.64c27cp+56,
362 -0x1.64c27ap+56, ALL_STD_EXCEPT, FE_INEXACT);
363 testrnd(fma, 0x1.31ad012ede8aap+100, 0x1.2fbf79c839067p-42,
364 -0x1.c3e106929056ep+58, -0x1.64c282b970a5fp+56,
365 -0x1.64c282b970a5ep+56, -0x1.64c282b970a5fp+56,
366 -0x1.64c282b970a5ep+56, ALL_STD_EXCEPT, FE_INEXACT);
367 #if LDBL_MANT_DIG == 113
368 testrnd(fmal, 0x1.31ad012ede8aa282fa1c19376d16p+100L,
369 0x1.2fbf79c839066f0f5c68f6d2e814p-42L,
370 -0x1.c3e106929056ec19de72bfe64215p+58L,
371 -0x1.64c282b970a612598fc025ca8cddp+56L,
372 -0x1.64c282b970a612598fc025ca8cddp+56L,
373 -0x1.64c282b970a612598fc025ca8cdep+56L,
374 -0x1.64c282b970a612598fc025ca8cddp+56L,
375 ALL_STD_EXCEPT, FE_INEXACT);
376 #elif LDBL_MANT_DIG == 64
377 testrnd(fmal, 0x1.31ad012ede8aa4eap+100L, 0x1.2fbf79c839066aeap-42L,
378 -0x1.c3e106929056e61p+58L, -0x1.64c282b970a60298p+56L,
379 -0x1.64c282b970a60298p+56L, -0x1.64c282b970a6029ap+56L,
380 -0x1.64c282b970a60298p+56L, ALL_STD_EXCEPT, FE_INEXACT);
381 #elif LDBL_MANT_DIG == 53
382 testrnd(fmal, 0x1.31ad012ede8aap+100L, 0x1.2fbf79c839067p-42L,
383 -0x1.c3e106929056ep+58L, -0x1.64c282b970a5fp+56L,
384 -0x1.64c282b970a5ep+56L, -0x1.64c282b970a5fp+56L,
385 -0x1.64c282b970a5ep+56L, ALL_STD_EXCEPT, FE_INEXACT);
388 /* x*y (rounded) ~= -z */
389 /* XXX spurious inexact exceptions */
390 testrnd(fmaf, 0x1.bbffeep-30, -0x1.1d164cp-74, 0x1.ee7296p-104,
391 -0x1.c46ea8p-128, -0x1.c46ea8p-128, -0x1.c46ea8p-128,
392 -0x1.c46ea8p-128, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
393 testrnd(fma, 0x1.bbffeea6fc7d6p-30, 0x1.1d164c6cbf078p-74,
394 -0x1.ee72993aff948p-104, -0x1.71f72ac7d9d8p-159,
395 -0x1.71f72ac7d9d8p-159, -0x1.71f72ac7d9d8p-159,
396 -0x1.71f72ac7d9d8p-159, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
397 #if LDBL_MANT_DIG == 113
398 testrnd(fmal, 0x1.bbffeea6fc7d65927d147f437675p-30L,
399 0x1.1d164c6cbf078b7a22607d1cd6a2p-74L,
400 -0x1.ee72993aff94973876031bec0944p-104L,
401 0x1.64e086175b3a2adc36e607058814p-217L,
402 0x1.64e086175b3a2adc36e607058814p-217L,
403 0x1.64e086175b3a2adc36e607058814p-217L,
404 0x1.64e086175b3a2adc36e607058814p-217L,
405 ALL_STD_EXCEPT & ~FE_INEXACT, 0);
406 #elif LDBL_MANT_DIG == 64
407 testrnd(fmal, 0x1.bbffeea6fc7d6592p-30L, 0x1.1d164c6cbf078b7ap-74L,
408 -0x1.ee72993aff949736p-104L, 0x1.af190e7a1ee6ad94p-168L,
409 0x1.af190e7a1ee6ad94p-168L, 0x1.af190e7a1ee6ad94p-168L,
410 0x1.af190e7a1ee6ad94p-168L, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
411 #elif LDBL_MANT_DIG == 53
412 testrnd(fmal, 0x1.bbffeea6fc7d6p-30L, 0x1.1d164c6cbf078p-74L,
413 -0x1.ee72993aff948p-104L, -0x1.71f72ac7d9d8p-159L,
414 -0x1.71f72ac7d9d8p-159L, -0x1.71f72ac7d9d8p-159L,
415 -0x1.71f72ac7d9d8p-159L, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
420 test_double_rounding(void)
424 * a = 0x1.8000000000001p0
425 * b = 0x1.8000000000001p0
426 * c = -0x0.0000000000000000000000000080...1p+1
427 * a * b = 0x1.2000000000001800000000000080p+1
429 * The correct behavior is to round DOWN to 0x1.2000000000001p+1 in
430 * round-to-nearest mode. An implementation that computes a*b+c in
431 * double+double precision, however, will get 0x1.20000000000018p+1,
434 fesetround(FE_TONEAREST);
435 test(fma, 0x1.8000000000001p0, 0x1.8000000000001p0,
436 -0x1.0000000000001p-104, 0x1.2000000000001p+1,
437 ALL_STD_EXCEPT, FE_INEXACT);
438 fesetround(FE_DOWNWARD);
439 test(fma, 0x1.8000000000001p0, 0x1.8000000000001p0,
440 -0x1.0000000000001p-104, 0x1.2000000000001p+1,
441 ALL_STD_EXCEPT, FE_INEXACT);
442 fesetround(FE_UPWARD);
443 test(fma, 0x1.8000000000001p0, 0x1.8000000000001p0,
444 -0x1.0000000000001p-104, 0x1.2000000000002p+1,
445 ALL_STD_EXCEPT, FE_INEXACT);
447 fesetround(FE_TONEAREST);
448 test(fmaf, 0x1.800002p+0, 0x1.800002p+0, -0x1.000002p-46, 0x1.200002p+1,
449 ALL_STD_EXCEPT, FE_INEXACT);
450 fesetround(FE_DOWNWARD);
451 test(fmaf, 0x1.800002p+0, 0x1.800002p+0, -0x1.000002p-46, 0x1.200002p+1,
452 ALL_STD_EXCEPT, FE_INEXACT);
453 fesetround(FE_UPWARD);
454 test(fmaf, 0x1.800002p+0, 0x1.800002p+0, -0x1.000002p-46, 0x1.200004p+1,
455 ALL_STD_EXCEPT, FE_INEXACT);
457 fesetround(FE_TONEAREST);
458 #if LDBL_MANT_DIG == 64
459 test(fmal, 0x1.4p+0L, 0x1.0000000000000004p+0L, 0x1p-128L,
460 0x1.4000000000000006p+0L, ALL_STD_EXCEPT, FE_INEXACT);
461 #elif LDBL_MANT_DIG == 113
462 test(fmal, 0x1.8000000000000000000000000001p+0L,
463 0x1.8000000000000000000000000001p+0L,
464 -0x1.0000000000000000000000000001p-224L,
465 0x1.2000000000000000000000000001p+1L, ALL_STD_EXCEPT, FE_INEXACT);
470 static const int rmodes[] = {
471 FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
474 ATF_TC_WITHOUT_HEAD(zeroes);
475 ATF_TC_BODY(zeroes, tc)
477 for (size_t i = 0; i < nitems(rmodes); i++) {
478 printf("rmode = %d\n", rmodes[i]);
479 fesetround(rmodes[i]);
484 ATF_TC_WITHOUT_HEAD(infinities);
485 ATF_TC_BODY(infinities, tc)
487 for (size_t i = 0; i < nitems(rmodes); i++) {
488 printf("rmode = %d\n", rmodes[i]);
489 fesetround(rmodes[i]);
494 ATF_TC_WITHOUT_HEAD(nans);
495 ATF_TC_BODY(nans, tc)
497 fesetround(FE_TONEAREST);
502 ATF_TC_WITHOUT_HEAD(small_z);
503 ATF_TC_BODY(small_z, tc)
505 for (size_t i = 0; i < nitems(rmodes); i++) {
506 printf("rmode = %d\n", rmodes[i]);
507 fesetround(rmodes[i]);
513 ATF_TC_WITHOUT_HEAD(big_z);
514 ATF_TC_BODY(big_z, tc)
516 for (size_t i = 0; i < nitems(rmodes); i++) {
517 printf("rmode = %d\n", rmodes[i]);
518 fesetround(rmodes[i]);
523 ATF_TC_WITHOUT_HEAD(accuracy);
524 ATF_TC_BODY(accuracy, tc)
526 fesetround(FE_TONEAREST);
530 ATF_TC_WITHOUT_HEAD(double_rounding);
531 ATF_TC_BODY(double_rounding, tc) {
532 test_double_rounding();
537 ATF_TP_ADD_TC(tp, zeroes);
538 ATF_TP_ADD_TC(tp, infinities);
539 ATF_TP_ADD_TC(tp, nans);
540 ATF_TP_ADD_TC(tp, small_z);
541 ATF_TP_ADD_TC(tp, big_z);
542 ATF_TP_ADD_TC(tp, accuracy);
543 ATF_TP_ADD_TC(tp, double_rounding);
546 * - Tests for subnormals
547 * - Cancellation tests (e.g., z = (double)x*y, but x*y is inexact)
549 return (atf_no_error());